composition of nanocellulose and product containing nanocellulose

专利摘要:
NANOCELLULOSE COMPOSITIONS, HYDROPHOBIC NANOCELLULOSE COMPOSITION WITH A CELLULOSE CRYSTALINITY OF AROUND 70% OR MORE, AND NANOCELLULOSE CONTAINING PRODUCT. The disclosed processes are capable of converting biomass into high crystallinity nanocellulose with surprisingly low mechanical energy input. In some variations, the process includes fractionating biomass with an acid (such as sulfur dioxide), a solvent (such as ethanol), and water, to generate cellulose-rich solids and a liquid containing hemicellulose and lignin; and the mechanical treatment of cellulose-rich solids to form nanofibrils and/or nanocrystals. The total mechanical energy can be less than 500 kilowatt hours per ton. The crystallinity of the nanocellulose material can be 80% or higher, which translates into good reinforcing properties for the composites. The nanocellulose material can include nanofibrillated cellulose, nanocrystalline cellulose, or both. In some embodiments, the nanocellulose material is hydrophobic by depositing a certain amount of lignin onto the surface of the cellulose. Optionally, sugars derived from amorphous cellulose and hemicellulose can be fermented separately, as to monomers for various polymers. These polymers can be combined with nanocellulose to form completely renewable composites.
公开号:BR112014000864B1
申请号:R112014000864-7
申请日:2013-11-28
公开日:2021-05-25
发明作者:Kimberly Nelson；Theodora Reysina；Vesa Pylkkanen；Ryan O'Connor
申请人:GranBio Intellectual Property Holdings, LLC；
IPC主号:

专利说明:

PRIORITY DATA
[001] This international patent application claims priority to US Patent Application No. US 14/092,906, filed November 27, 2013, US Patent Application No. US 14/092,908, filed November 27, 2013, application US Patent No. US 14/092,910, filed November 27, 2013, US Provisional Patent Application No. US 61/897,156, filed October 29, 2013, US Provisional Patent Application No. US 61/838,985, filed June 25, 2013, and US Provisional Patent Application No. US 61/732,047, filed November 30, 2012, each of which is incorporated herein by reference. FIELD
[002] The present invention relates, in general, to nanocellulose materials, and related, produced by the fractionation of lignocellulosic biomass and further processing of the cellulose fraction. HISTORIC
[003] Biomass refining (or biorefining) has become more prevalent in the industry. Cellulose fibers and sugars, hemicellulose sugars, lignin, synthesis gas, and derivatives of these intermediates are being used for chemical and fuel production. In effect, we are now looking at the commercialization of integrated biorefineries that are capable of processing incoming biomass in the same way that oil refineries now process crude oil. Underutilized lignocellulosic biomass feedstocks have the potential to be much cheaper than oil, on a carbon basis, as well as being much better from an environmental lifecycle standpoint.
[004] Lignocellulosic biomass is the most abundant renewable material on the planet, and has long been recognized as a potential raw material to produce chemicals, fuels and materials. Lignocellulosic biomass usually comprises mainly cellulose, hemicellulose and lignin. Cellulose and hemicellulose are natural polymers of sugars, and lignin is an aromatic/aliphatic hydrocarbon polymer reinforcing the entire biomass network. Some forms of biomass (eg recycled materials) do not contain hemicellulose.
[005] Despite being the most available natural polymer on earth, it is only recently that cellulose has gained importance as a nanoconstructed material, in the form of nanocrystalline cellulose (NCC), nanofibrillated cellulose (NFC), and bacterial cellulose (BC). Nanocellulose is being developed for use in a wide variety of applications, such as polymeric reinforcement, antimicrobial films, biodegradable food packaging, printing papers, pigments and inks, packaging in paper and cardboard, barrier films, adhesives, biocomposites, healing wound, pharmaceutical and drug delivery, textiles, water-soluble polymers, building materials, recyclable interior and structural components for the transportation industry, rheological modifiers, low calorie food additives, cosmetic thickeners, pharmaceutical tablet binders, bioactive paper, pickering type stabilizers for emulsion and particle stabilized foams, ink formulations, optical switch films, and detergents. Despite the great advantages of nanocellulose, such as its non-toxicity and excellent mechanical properties, its use to date has been in niche applications. Its sensitivity to moisture, its incompatibility with oleophilic polymers, and the high energy consumption required to produce, for example, NFC, have, to date, prevented it from competing with other bulk products such as plain paper or plastic. See “THE GLOBAL MARKET FOR NANOCELLULOSE TO 2017,” FUTURE MARKETS INC. TECHNOLOGY REPORT No. 60, SECOND EDITION (October 2012).
[006] The pulp derived from biomass can be converted into nanocellulose by mechanical processing. Although the process can be simple, disadvantages include high energy consumption, damage to fibers and particles due to intense mechanical treatment, and a wide distribution in diameter and length of fibrils.
[007] The pulp derived from biomass can be converted into nanocellulose by chemical processing. For example, pulp can be treated with a 2,2,6,6-tetramethylpiperidine-1-oxy radical (TEMPO) to produce nanocellulose. Such a technique reduces energy consumption compared to mechanical treatment and can produce more uniform particle sizes, but the process is not considered economically viable.
[008] Better processes to produce nanocellulose from biomass at lower energy costs are needed in the technique. In addition, better raw materials (ie, biomass-derived pulps) are needed in the technique to produce nanocellulose. It would be particularly desirable for new processes to possess raw material flexibility and process flexibility to produce nanofibrils, nanocrystals, or both, as well as co-produce sugars, lignin, and other co-products. For some applications, it is desirable to produce nanocellulose with high crystallinity, which leads to good mechanical properties of nanocellulose or composites containing nanocellulose. For certain applications, it would be beneficial to increase the hydrophobicity of nanocellulose. SUMMARY
[009] In some variations, the present invention provides a process for producing a nanocellulose material, the process comprising: (b) the provision of a lignocellulosic biomass feedstock; (c) fractionating the raw material in the presence of an acid, a solvent for lignin, and water, to generate cellulose-rich solids and a liquid containing hemicellulose and lignin; (d) mechanical treatment of cellulose rich solids to form cellulose fibrils and/or cellulose crystals, thereby generating a nanocellulose material having a crystallinity of at least 60%; and (e) the recovery of the nanocellulose material.
[010] In some embodiments, the acid is selected from the group consisting of sulfur dioxide, sulfurous acid, sulfur trioxide, sulfuric acid, lignosulfonic acid, and combinations thereof. In specific embodiments, the acid is sulfur dioxide.
[011] In some embodiments, during step (c), the cellulose-rich solids are treated with a total mechanical energy of less than about 1000 kilowatt hours per ton of the cellulose-rich solids, such as less than about 500 kilowatts -hours per ton of cellulose-rich solids. In certain embodiments, the total mechanical energy is from about 100 kilowatt-hours to about 400 kilowatt-hours per ton of the cellulose-rich solids.
[012] Step (c) may further comprise treating the cellulose-rich solids with one or more enzymes or one or more acids. When acids are employed, they may be selected from the group consisting of sulfur dioxide, sulfurous acid, lignosulphonic acid, acetic acid, formic acid, and combinations thereof. In addition, step (c) may include treating the cellulose rich solids with heat. In some embodiments, step (c) does not employ any enzyme or acid.
[013] In some embodiments, the crystallinity of the nanocellulose material is at least 70%, 75%, 80%, or 85% (or greater).
[014] The process may further comprise bleaching the cellulose rich solids before step (c) and/or as part of step (c). Alternatively, or additionally, the process may further comprise bleaching the nanocellulose material during step (c) and/or after step (c).
[015] The nanocellulose material can include, or consist essentially of nanofibrillated cellulose. The nanocellulose material can include, or consist essentially of, nanocrystalline cellulose. In some embodiments, the nanocellulose material can include, or consist essentially of, nanofibrillated cellulose and nanocrystalline cellulose.
[016] In some embodiments, the nanocellulose material is characterized by an average degree of polymerization of about 100 to about 1500. For example, the nanocellulose material can be characterized by an average degree of polymerization of about 300 to about from 700, or from about 150 to about 250.
[017] Optionally, the process further comprises the hydrolysis of the amorphous cellulose into glucose in step (b) and/or in step (c), the recovery of glucose, and the fermentation of the glucose to a fermentation product. Optionally, the process further comprises recovering, fermenting, or further treating hemicellulose sugars derived from hemicellulose. Optionally, the process further comprises recovering, burning, or further treating the lignin.
[018] When hemicellulose sugars are recovered and fermented, they can be fermented to produce a monomer or a precursor thereof. The monomer can be polymerized to produce a polymer, which can then be combined with the nanocellulose material to form a polymer-nanocellulose composite.
[019] In some embodiments, the nanocellulose material is at least partially hydrophobic through the deposition of at least part of the lignin on a surface of the cellulose-rich solids during step (b). In these or other embodiments, the nanocellulose material is at least partially hydrophobic by depositing at least part of the lignin onto a surface of the nanocellulose material during step (c) or step (d).
[020] In some embodiments, the process further comprises chemically converting the nanocellulose material into one or more nanocellulose derivatives. For example, nanocellulose derivatives can be selected from the group consisting of nanocellulose esters, nanocellulose ethers, nanocellulose ether esters, alkylated nanocellulose compounds, crosslinked nanocellulose compounds, acid-functionalized nanocellulose compounds, nanocellulose compounds functionalized in base, and combinations thereof.
[021] Certain variations provide a process for producing a nanocellulose material, the process comprising: (a) the provision of a lignocellulosic biomass feedstock; (b) the fractionation of the raw material in the presence of sulfur dioxide, a solvent for lignin, and water, to generate solids rich in cellulose and a liquid containing oligomers of hemicellulose and lignin, in which the crystallinity of solids rich in cellulose is at least 70%, wherein the SO2 concentration is from about 10% by weight to about 50% by weight, the fractionating temperature is from about 130°C to about 200°C, and the fractionation time is about 30 minutes to about 4 hours; (c) mechanical treatment of cellulose rich solids to form cellulose fibrils and/or cellulose crystals, thereby generating a nanocellulose material having a crystallinity of at least 70%; and (d) the recovery of the nanocellulose material.
[022] In some embodiments, the concentration of SO2 is from about 12% by weight to about 30% by weight. In some embodiments, the fractionation temperature is from about 140°C to about 170°C. In some embodiments, the splitting time is from about 1 hour to about 2 hours. The process can be controlled such that, during step (b), a portion of the solubilized lignin intentionally deposits back onto a surface of the cellulose rich solids, thus making the cellulose rich solids at least partially hydrophobic.
[023] In some embodiments, the present invention provides a process for producing a hydrophobic nanocellulose material, the process comprising: (a) providing a lignocellulosic biomass feedstock; (b) the fractionation of the raw material in the presence of an acid, a solvent for lignin, and water, to generate cellulose-rich solids and a liquid containing hemicellulose and lignin, in which a portion of the lignin deposits on a surface of the solids cellulose-rich, thus making the cellulose-rich solids at least partially hydrophobic; (c) mechanical treatment of cellulose rich solids to form cellulose fibrils and/or cellulose crystals, thereby generating a hydrophobic nanocellulose material having a crystallinity of at least 60%; and (d) recovering the hydrophobic nanocellulose material.
[024] In some embodiments, the acid is selected from the group consisting of sulfur dioxide, sulfurous acid, sulfur trioxide, sulfuric acid, lignosulfonic acid, and combinations thereof.
[025] In some embodiments, during step (c), the cellulose-rich solids are treated with a total mechanical energy of less than about 1000 kilowatt hours per ton of the cellulose-rich solids, such as less than about 500 kilowatts -hours per ton of cellulose-rich solids.
[026] The crystallinity of the nanocellulose material is at least 70% or at least 80%, in various embodiments.
[027] The nanocellulose material can include nanofibrillated cellulose, nanocrystalline cellulose, or both nanofibrillated and nanocrystalline cellulose. The nanocellulose material can be characterized by an average degree of polymerization of from about 100 to about 1500, such as from about 300 to about 700, or from about 150 to about 250.
[028] Optionally, the process for producing a hydrophobic nanocellulose material may additionally include chemical modification of lignin to increase the hydrophobicity of the nanocellulose material. The chemical modification of lignin can be conducted during step (b), step (c), step (d), after step (d), or some combination.
[029] The present invention also provides, in some variations, a process to produce a product containing nanocellulose, the process comprising: (a) the provision of a raw material of lignocellulosic biomass; (b) fractionating the raw material in the presence of an acid, a solvent for lignin, and water, to generate cellulose-rich solids and a liquid containing hemicellulose and lignin; (c) mechanical treatment of cellulose rich solids to form cellulose fibrils and/or cellulose crystals, thereby generating a nanocellulose material having a crystallinity of at least 60%; and (d) incorporating at least a portion of the nanocellulose material into a nanocellulose-containing product.
[030] The product containing nanocellulose includes the nanocellulose material, or a treated form thereof. In some embodiments, the nanocellulose-containing product consists essentially of the nanocellulose material.
[031] In some embodiments, step (d) comprises the formation of a structural object that includes the nanocellulose material, or a derivative thereof.
[032] In some embodiments, step (d) comprises the formation of a foam or an airgel that includes the nanocellulose material, or a derivative thereof.
[033] In some embodiments, step (d) comprises combining the nanocellulose material, or a derivative thereof, with one or more materials to form a composite. For example, the other material can include a polymer selected from polyolefins, polyesters, polyurethanes, polyamides, or combinations thereof. Alternatively, or in addition, the other material may include carbon in various forms.
[034] The nanocellulose material incorporated into a product containing nanocellulose can be at least partially hydrophobic by depositing at least part of the lignin on a surface of the cellulose-rich solids during step (b). Furthermore, the nanocellulose material can be at least partially hydrophobic by depositing at least part of the lignin onto a surface of the nanocellulose material during step (c) or step (d).
[035] In some embodiments, step (d) comprises the formation of a film comprising the nanocellulose material, or a derivative thereof. The film is optically transparent and flexible in certain embodiments.
[036] In some embodiments, step (d) comprises the formation of a coating or coating precursor comprising the nanocellulose material, or a derivative thereof. In some embodiments, the nanocellulose-containing product is a paper coating.
[037] In some embodiments, the nanocellulose-containing product is configured as a catalyst, catalyst substrate, or co-catalyst. In some embodiments, the nanocellulose-containing product is electrochemically configured to carry or store an electrical current or voltage.
[038] In some embodiments, the product containing nanocellulose is incorporated into a filter, membrane, or other separation device.
[039] In some embodiments, the nanocellulose-containing product is incorporated as an additive in a coating, a paint, or an adhesive. In some embodiments, the nanocellulose-containing product is incorporated as a cement additive.
[040] In some embodiments, the product containing nanocellulose is incorporated as a thickening agent or rheological modifier. For example, the nanocellulose-containing product can be an additive in a drilling fluid, such as (among others) an oil recovery fluid and/or a gas recovery fluid.
[041] The present invention also provides nanocellulose compositions. In some variations, a nanocellulose composition comprises nanofibrillated cellulose having a cellulose crystallinity of about 70% or greater. The nanocellulose composition can include lignin and sulfur.
[042] In some variations, a nanocellulose composition comprises nanofibrillated cellulose and nanocrystalline cellulose, wherein the nanocellulose composition is characterized by an overall cellulose crystallinity of about 70% or more. The nanocellulose composition can include lignin and sulfur.
[043] In some variations, a nanocellulose composition comprises nanocrystalline cellulose with a cellulose crystallinity of about 80% or greater, wherein the nanocellulose composition comprises lignin and sulfur.
[044] In some embodiments, the crystallinity of cellulose is about 75% or greater, such as about 80% or greater, or about 85% or greater. In several embodiments, the nanocellulose composition is not derived from tunicates.
[045] The nanocellulose composition of some embodiments is characterized by an average degree of cellulose polymerization from about 100 to about 1000, such as from about 300 to about 700, or from about 150 to about 250. In certain embodiments, the nanocellulose composition is characterized by a cellulose polymerization degree distribution having a single peak. In certain embodiments, the nanocellulose composition is enzyme free.
[046] Other variations provide a hydrophobic nanocellulose composition with a cellulose crystallinity of about 70% or more, wherein the nanocellulose composition contains nanocellulose particles having a surface concentration of lignin that is greater than an internal concentration (internal particles ) of lignin. In some embodiments, there is a coating or thin film of lignin on nanocellulose particles, but the coating or film need not be uniform.
[047] The hydrophobic nanocellulose composition may have a cellulose crystallinity of about 75% or greater, about 80% or greater, or about 85% or greater. The hydrophobic nanocellulose composition can additionally include sulfur.
[048] The composition of hydrophobic nanocellulose may or may not be derived from tunicates. The hydrophobic nanocellulose composition can be enzyme free.
[049] In some embodiments, the hydrophobic nanocellulose composition is characterized by an average degree of cellulose polymerization from about 100 to about 1500, such as from about 300 to about 700, or from about 150 to about 250. The nanocellulose composition can be characterized by a cellulose polymerization degree distribution having a single peak.
[050] A product containing nanocellulose can include any of the disclosed nanocellulose compositions. Many products containing nanocellulose are possible. For example, a nanocellulose-containing product can be selected from the group consisting of a structural object, a foam, an airgel, a polymer composite, a carbon composite, a film, a coating, a coating precursor, a current carrier, or strain, a filter, a membrane, a catalyst, a catalyst substrate, a coating additive, a paint additive, an adhesive additive, a cement additive, a paper coating, a thickening agent, a rheological modifier, a additive to a drilling fluid, and combinations or derivatives thereof.
[051] Some variations provide a nanocellulose material produced by a process comprising: (a) the provision of a lignocellulosic biomass feedstock; (b) fractionating the raw material in the presence of an acid, a solvent for lignin, and water, to generate cellulose-rich solids and a liquid containing hemicellulose and lignin; (c) mechanical treatment of cellulose rich solids to form cellulose fibrils and/or cellulose crystals, thereby generating a nanocellulose material having a crystallinity of at least 60%; and (d) the recovery of the nanocellulose material.
[052] Some embodiments provide a polymer-nanocellulose composite material produced by a process comprising: (a) the provision of a lignocellulosic biomass feedstock; (b) fractionating the raw material in the presence of an acid, a solvent for lignin, and water, to generate cellulose-rich solids and a liquid containing hemicellulose and lignin; (c) mechanical treatment of cellulose rich solids to form cellulose fibrils and/or cellulose crystals, thereby generating a nanocellulose material having a crystallinity of at least 60%; (d) recovery of the nanocellulose material; (e) the fermentation of hemicellulose derived sugars from hemicellulose to produce a monomer or precursor thereof; (f) polymerizing the monomer to produce a polymer; and (g) combining the polymer and the nanocellulose material to form the polymernanocellulose composite.
[053] Some variations provide a nanocellulose material produced by a process comprising: (a) the provision of a lignocellulosic biomass feedstock; (b) the fractionation of the raw material in the presence of sulfur dioxide, a solvent for lignin, and water, to generate solids rich in cellulose and a liquid containing oligomers of hemicellulose and lignin, in which the crystallinity of solids rich in cellulose is at least 70%, wherein the SO2 concentration is from about 10% by weight to about 50% by weight, the fractionating temperature is from about 130°C to about 200°C, and the fractionation time is about 30 minutes to about 4 hours; (c) mechanical treatment of cellulose rich solids to form cellulose fibrils and/or cellulose crystals, thereby generating a nanocellulose material having a crystallinity of at least 70%; and (d) the recovery of the nanocellulose material.
[054] Some variations provide a hydrophobic nanocellulose material produced by a process comprising: (a) the provision of a lignocellulosic biomass feedstock; (b) the fractionation of the raw material in the presence of an acid, a solvent for lignin, and water, to generate cellulose-rich solids and a liquid containing hemicellulose and lignin, in which a portion of the lignin deposits on a surface of the solids cellulose-rich solids, thereby making the cellulose-rich solids at least partially hydrophobic; (c) the mechanical treatment of cellulose-rich solids to form cellulose fibrils and/or cellulose crystals, thus generating a hydrophobic nanocellulose material having a crystallinity of at least 60%; and (d) recovering the hydrophobic nanocellulose material.
[055] Some variations provide a product containing nanocellulose produced by a process comprising: (a) the provision of a lignocellulosic biomass feedstock; (b) fractionating the raw material in the presence of an acid, a solvent for lignin, and water, to generate cellulose-rich solids and a liquid containing hemicellulose and lignin; (c) mechanical treatment of cellulose rich solids to form cellulose fibrils and/or cellulose crystals, thereby generating a nanocellulose material having a crystallinity of at least 60%; and (d) incorporating at least a portion of the nanocellulose material into a nanocellulose-containing product.
[056] A product that includes the nanocellulose material may be selected from the group consisting of a structural object, a foam, an airgel, a polymer composite, a carbon composite, a film, a coating, a coating precursor, a current or voltage carrier, a filter, a membrane, a catalyst, a catalyst substrate, a coating additive, a paint additive, an adhesive additive, a cement additive, a paper coating, a thickening agent, a rheological modifier, an additive to a drilling fluid, and combinations or derivatives thereof. BRIEF DESCRIPTION OF THE FIGURES
[057] Figure 1 illustrates the production of nanocellulose materials from biomass, according to some embodiments of the invention.
[058] Figure 2 illustrates the production of nanocellulose materials from biomass, according to some embodiments of the invention.
[059] Figure 3 illustrates the production of nanocellulose materials from biomass, according to some embodiments of the invention.
[060] Figure 4 illustrates the production of nanocellulose materials from biomass, according to some embodiments of the invention.
[061] Figure 5 is a graph showing the degree of experimental polymerization of nanocellulose versus fractionation time, in some embodiments.
[062] Figure 6 is a graph showing nanocellulose experimental Kappa number versus fractionation time, in some embodiments.
[063] Figure 7 is a scanning electron microscopy image of nanofibrils, in some embodiments.
[064] Figure 8 is a scanning electron microscopy image of nanocrystals, in some embodiments.
[065] Figure 9 is a transmission electron microscopy image of nanocrystals (whiskers), in some embodiments. DETAILED DESCRIPTION OF SOME ACHIEVEMENTS
[066] The description will allow a person skilled in the art to make and use the invention, and describe various embodiments, adaptations, variations, and describe various embodiments, adaptations, variations, alternatives, and uses of the invention. These and other embodiments, features, and advantages of the present invention will become more apparent to one skilled in the art when taken with reference to the following detailed description of the invention in conjunction with any accompanying drawings.
[067] As used in this specification and the appended claims, the singular forms “a”, “an”, and “the” include plural referents, unless the context clearly indicates otherwise. Unless defined otherwise, all technical and scientific terms used in this document have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. All composition numbers and percentage-based ranges are percentages by weight unless otherwise noted. All ranges of numbers or conditions are intended to encompass any specific value contained within the range, rounded to any appropriate decimal point.
[068] Unless otherwise indicated, all numbers expressing parameters, reaction conditions, concentrations of components, and so on, used in the specification and claims shall be understood to be modified in all cases by the term "about" . Therefore, unless otherwise indicated, the numerical parameters set forth in the following specification and appended claims are approximations that may vary depending on at least one specific analytical technique.
[069] The term "comprising", which is synonymous with "including", "containing", or "characterized by" is inclusive, or open, and does not exclude unquoted elements or additional method steps. “Understanding” is a technical term used in claims language, which means that the elements cited in the claim are essential, but other claims elements can be added and still form a construct within the scope of the claim.
[070] As used herein, the term “consisting of” excludes any element, step, or ingredient not specified in the claim. When the expression “consists of” (or variations thereof) appears in a clause in the body of a claim, rather than immediately following the preamble, it limits only the elements set out in that clause; other elements are not excluded from a claim as a whole. As used in this document, the term “consisting essentially of” limits the scope of a claim to specified elements or method steps, plus those that do not materially affect the basis and characteristic(s) of the matter claimed.
[071] In relation to the terms "comprising", "consisting of", and "consisting essentially of", where one of these three terms is used in this document, the present disclosed and claimed matter may include the use of either of the two other terms . Thus, in some realizations not explicitly recited otherwise, any instance of "comprising" may be replaced by "consisting of" or, alternatively, by "consisting essentially of".
[072] In general, it is beneficial to process biomass in a way that effectively separates the main fractions (cellulose, hemicellulose and lignin) from each other. Cellulose can undergo further processing to produce nanocellulose. The fractionation of lignocellulosics leads to the release of cellulosic fibers and opens the cell wall structure by dissolving lignin and hemicellulose between the cellulose fibrils. Fibers become more accessible for conversion to nanofibrils or nanocrystals. Hemicellulose sugars can be fermented into a variety of products, such as ethanol, or converted to other chemicals. Biomass lignin has value as a solid fuel and also as an energy feedstock to produce liquid fuels, synthesis gas, or hydrogen; and as an intermediate to make a variety of polymeric compounds. Furthermore, minor components such as proteins or rare sugars can be extracted and purified for special applications.
[073] This disclosure describes processes and apparatus to efficiently fractionate any lignocellulosic-based biomass into its major major components (cellulose, lignin, and, if present, hemicellulose) to teach that each can can be used in potentially distinct processes. An advantage of the process is that it produces cellulose-rich solids, while concurrently producing a liquid phase containing a high yield of both hemicellulose sugars and lignin, and low amounts of lignin and hemicellulose degradation products. The flexible fractionation technique allows multiple uses for the products. Cellulose is an advantageous precursor for producing nanocellulose, as will be described in this document.
[074] The present invention, in some variations, is premised on the discovery that nanocellulose and related materials can be produced under certain conditions, including process conditions and steps associated with the AVAP® process. It has surprisingly been found that very high crystallinity can be produced and maintained during the formation of nanofibers or nanocrystals, without the need for a separate enzymatic or acidic treatment step to hydrolyze the amorphous cellulose. High crystallinity can translate into mechanically strong fibers or good reinforcing properties, which is advantageous for composites, reinforced polymers, and high strength spun fibers and textiles, for example.
[075] A significant techno-economic barrier to the production of cellulose nanofibrils (CNF) is the high energy consumption and high cost. Using sulfur dioxide (SO2) and ethanol (or other solvent), the pretreatment disclosed in this document effectively removes not only hemicellulose and lignin from biomass, but also the amorphous regions of cellulose, providing a unique, highly crystalline product that requires minimal mechanical energy for conversion to CNF. The low mechanical energy requirement results from the fibrillated cellulose network formed during chemical pretreatment after removal of the amorphous regions of cellulose.
[076] As intended herein, "nanocellulose" is broadly defined to include a range of cellulosic materials, including, but not limited to, microfibrillated cellulose, nanofibrillated cellulose, microcrystalline cellulose, nanocrystalline cellulose, and particulate or fibrillated dissolving pulp. Typically, nanocellulose as provided herein will include particles having at least one dimension in length (e.g., diameter) on the nanometer scale.
[077] “Nanofibrillated cellulose” or, equivalently, “cellulose nanofibrils”, means cellulose fibers in regions that contain nanometer-sized particles or fibers, or both micrometer and nanometer-sized particles or fibers. “Nanocrystalline cellulose”, or, equivalently, “cellulose nanocrystals”, means cellulose particles, regions, or crystals that contain nanometer-sized domains, or both micrometer-sized and nanometer-sized domains. “Micrometric size” includes from 1 μm to 100 μm, and “nanometer size” includes from 0.01 nm to 1000 nm (1 μm) . Larger domains (including long fibers) may also be present in these materials.
[078] Certain exemplary embodiments of the invention will now be described. These embodiments are not intended to limit the scope of the invention as claimed. The order of steps can be varied, some steps can be omitted, and/or other steps can be added. References in this document to step one, step two, etc., are only for the purpose of illustrating some achievements.
[079] In some variations, the present invention provides a process for producing a nanocellulose material, the process comprising: (a) the provision of a lignocellulosic biomass feedstock; (b) fractionating the raw material in the presence of an acid, a solvent for lignin, and water, to generate cellulose-rich solids and a liquid containing hemicellulose and lignin; (c) mechanically treating the cellulose rich solids to form cellulose fibrils and/or cellulose crystals, thereby generating a nanocellulose material having a crystallinity (i.e., cellulose crystallinity) of at least 60%; and (d) the recovery of the nanocellulose material.
[080] In some embodiments, the acid is selected from the group consisting of sulfur dioxide, sulfurous acid, sulfur trioxide, sulfuric acid, lignosulfonic acid, and combinations thereof. In specific embodiments, the acid is sulfur dioxide.
[081] The biomass feedstock can be selected from hardwoods, resinous, forest residues, eucalyptus, industrial residues, pulp and paper residues, consumer residues, or combinations thereof. Some projects use agricultural residues, which include lignocellulosic biomass associated with food crops, annual grasses, energy crops, or other annually renewable raw materials. Exemplary agricultural wastes include, but are not limited to, corn straw, corn fiber, wheat straw, sugarcane bagasse, sugarcane straw, rice straw, oat straw, barley straw, Miscanthus, straw/waste from cane-energy, or combinations thereof. The process revealed in this document benefits from the flexibility of the raw material; it is effective for a wide variety of raw materials containing cellulose.
[082] As used herein, “lignocellulosic biomass” means any material containing cellulose and lignin. Lignocellulosic biomass may also contain hemicellulose. Mixtures of one or more types of biomass can be used. In some embodiments, the biomass feedstock comprises both a lignocellulosic component (such as one described above) plus a sucrose-containing component (e.g., sugarcane or energy cane) and/or a starch component ( eg corn, wheat, rice, etc.). Various moisture levels can be associated with starting biomass. Biomass feedstock does not need it, but it can be relatively dry. In general, biomass is in the form of a particulate or chip, but particle size is not critical in this invention.
[083] In some embodiments, during step (c), the cellulose-rich solids are treated with a total mechanical energy of less than about 1000 kilowatt-hours per ton of the cellulose-rich solids, such as less than about 950, 900, 850, 800, 750, 700, 650, 600, 550, 500, 450, 400, 350, 300, or 250 kilowatt hours per ton of the cellulose-rich solids. In certain embodiments, the total mechanical energy is about 100 kilowatt hours to about 400 kilowatt hours per ton of the cellulose-rich solids. Power consumption can be measured in other suitable units. An ammeter measuring the current drawn by a motor moving the mechanical treatment device is one way to get an estimate of the total mechanical energy.
[084] Mechanical treatment in step (c) can employ one or more known techniques, such as, among others, milling, grinding, beating, sonication, or any other means to form or release nanofibrils and/or nanocrystals in cellulose. Basically, any type of mill or device that physically separates the fibers can be used. Such mills are well known in the industry and include, but are not limited to, Valley beaters, single disc refiners, double disc refiners, conical refiners, including both wide angle and narrow angle, cylindrical refiners, homogenizers, microfluidizers, and other grinding or milling apparatus. crushing. See, for example, Smook, Handbook for Pulp & Paper Technologists, Tappi Press, 1992; and Hubbe et al., “Cellulose Nanocomposites: A Review,” BioResources 3(3), 929-980 (2008).
[085] The degree of mechanical treatment can be monitored during the process by any of several means. Certain optical instruments can provide continuous data regarding fiber length and % refinement distributions, either of which can be used to define endpoints for the mechanical treatment step. Time, temperature and pressure may vary during mechanical treatment. For example, in some embodiments, sonication for a time of about 5 minutes to 2 hours, at ambient temperature and pressure, can be used.
[086] In some embodiments, a portion of the cellulose-rich solids is converted to nanofibrils, while the remainder of the cellulose-rich solids is not fibrillated. In various embodiments, about 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, 99%, or substantially all cellulose-rich solids are fibrillated in nanofibrils.
[087] In some embodiments, a portion of the nanofibrils is converted to nanocrystals, while the remainder of the nanofibrils is not converted to nanocrystals. In various embodiments, about 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, 99%, or substantially all of the nanofibrils are converted to nanocrystals. During drying, it is possible for a small amount of nanocrystals to come together and form nanofibrils.
[088] After mechanical treatment, the nanocellulose material can be classified by particle size. A portion of material can be subjected to a separate process, such as separate hydrolysis to produce glucose. Such a material may have good crystallinity, for example, but may not have a desirable particle size or degree of polymerization.
[089] Step (c) may further comprise treating the cellulose-rich solids with one or more enzymes or one or more acids. When acids are employed, they may be selected from the group consisting of sulfur dioxide, sulfurous acid, lignosulphonic acid, acetic acid, formic acid, and combinations thereof. Acids associated with hemicellulose, such as acetic acid or uronic acids, can be used, alone or in conjunction with other acids. In addition, step (c) may include treating the cellulose rich solids with heat. In some embodiments, step (c) does not employ any enzyme or acid.
[090] In step (c), when an acid is employed, the acid can be a strong acid, such as sulfuric acid, nitric acid, or phosphoric acid, for example. Weaker acids can be used, under more severe temperature and/or weather. Enzymes that hydrolyze cellulose (ie, cellulases) and possibly hemicellulose (ie, with hemicellulase activity) can be employed in step (c), in place of the acids, or potentially in a sequential configuration before or after acid hydrolysis.
[091] In some embodiments, the process comprises enzymatic treatment of cellulose-rich solids to hydrolyze the amorphous cellulose. In other embodiments, either sequentially before or after the enzymatic treatment, the process may comprise acid treating the cellulose rich solids to hydrolyze amorphous cellulose.
[092] In other embodiments, the process additionally comprises the enzymatic treatment of nanocrystalline cellulose. In other embodiments, either sequentially before or after the enzymatic treatment, the process further comprises acid treating the nanocrystalline cellulose.
[093] If desired, an enzymatic treatment can be employed prior to, or possibly simultaneously with, mechanical treatment. However, in preferred embodiments, no enzymatic treatment is required to hydrolyze amorphous cellulose or weaken the fiber wall structure prior to insulating the nanofibers.
[094] After mechanical treatment, nanocellulose can be recovered. The separation of cellulose nanofibrils and/or nanocrystals can be performed using devices capable of disintegrating the ultrastructure of the cell wall while preserving the integrity of the nanofibrils. For example, a homogenizer can be employed. In some embodiments, aggregated cellulose fibrils having component fibrils in the range of 1 to 100 nm in width, where the fibrils have not been completely separated from one another, are recovered.
[095] The process may further comprise bleaching the cellulose rich solids prior to step (c) and/or as part of step (c). Alternatively, or additionally, the process may further comprise bleaching the nanocellulose material during step (c) and/or after step (c). Any known bleaching technology or sequence can be employed, including enzymatic bleaching.
[096] The nanocellulose material may include, or consist essentially of nanofibrillated cellulose. The nanocellulose material can include, or consist essentially of, nanocrystalline cellulose. In some embodiments, the nanocellulose material can include, or consist essentially of, nanofibrillated cellulose and nanocrystalline cellulose.
[097] In some embodiments, the crystallinity of cellulose-rich solids (ie, the nanocellulose precursor material) is at least 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67% , 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84 %, 85%, 86% or higher. In these other embodiments, the crystallinity of the nanocellulose material is at least 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86% or greater. Crystallinity can be measured using any known techniques. For example, X-ray diffraction and solid state 13C nuclear magnetic resonance can be used.
[098] It is notable that the nanocellulose precursor material has high crystallinity — which generally contributes to mechanical strength — however, very little mechanical energy consumption is required to separate the nanocellulose material into nanofibrils and nanocrystals. It is believed that since mechanical energy input is low, high crystallinity is essentially maintained in the final product.
[099] In some embodiments, the nanocellulose material is characterized by an average degree of polymerization of about 100 to about 1500, such as about 125, 150, 175, 200, 225, 250, 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, or 1400. For example, the nanocellulose material can be characterized by an average degree of polymerization of from about 300 to about 700, or from about 150 to about 250. The nanocellulose material, when in the form of nanocrystals, may have a degree of polymerization less than 100, such as about 75, 50, 25, or 10. Portions of the material may have a degree of polymerization that is greater that 1500, such as 2000, 3000, 4000 or 5000.
[0100] In some embodiments, the nanocellulose material is characterized by a polymerization degree distribution having a single peak. In some embodiments, the nanocellulose material is characterized by a degree of polymerization distribution having two peaks, such as one centered in the range 150 to 250 and another peak centered in the range 300 to 700.
[0101] In some embodiments, the nanocellulose material is characterized by an average particle length-to-width ratio of about 10 to about 1000, such as 15, 20, 25, 35, 50, 75, 100, 150, 200, 250, 300, 400, or 500. Nanofibrils are generally associated with greater proportions of shape than nanocrystals. Nanocrystals, for example, can have a length range of about 100 nm to 500 nm and a diameter of about 4 nm, which translates into a format ratio of 25 to 125. Nanofibrils can have a length of about 2000 nm and a diameter range from 5 to 50 nm, which translates to a shape ratio of 40 to 400. In some embodiments, the shape ratio is less than 50, less than 45, less than 40, less than 35, less than 30, less than 25, less than 20, less than 15, or less than 10.
[0102] Optionally, the process further comprises hydrolyzing the amorphous cellulose to glucose in step (b) and/or step (c), recovering the glucose, and fermenting the glucose to a fermentation product. Optionally, the process further comprises recovering, fermenting, or further treating hemicellulose sugars derived from hemicellulose. Optionally, the process further comprises recovering, burning, or further treating the lignin.
[0103] The glucose that is generated from the hydrolysis of amorphous cellulose can be integrated into a general process to produce ethanol, or another fermentation co-product. Thus, in some embodiments, the process further comprises hydrolyzing the amorphous cellulose to glucose in step (b) and/or step (c), and recovering the glucose. Glucose can be purified and sold. Or glucose can be fermented to a fermentation product such as, among others, ethanol. Glucose or a fermentation product can be recycled to the front-end, such as for hemicellulose sugar processing, if desired.
[0104] When hemicellulose sugars are recovered and fermented, they can be fermented to produce a monomer or a precursor thereof. The monomer can be polymerized to produce a polymer, which can then be combined with the nanocellulose material to form a polymer-nanocellulose composite.
[0105] In some embodiments, the nanocellulose material is at least partially hydrophobic through the deposition of at least part of the lignin onto a surface of the cellulose-rich solids during step (b). In these or other embodiments, the nanocellulose material is at least partially hydrophobic by depositing at least part of the lignin onto a surface of the nanocellulose material during step (c) or step (d).
[0106] In some embodiments, the process further comprises chemically converting the nanocellulose material into one or more nanocellulose derivatives. For example, nanocellulose derivatives can be selected from the group consisting of nanocellulose esters, nanocellulose ethers, nanocellulose ether esters, alkylated nanocellulose compounds, crosslinked nanocellulose compounds, acid-functionalized nanocellulose compounds, nanocellulose compounds functionalized in base, and combinations thereof.
[0107] Several types of functionalization or derivatization of nanocellulose can be used, such as functionalization using polymers, chemical surface modification, functionalization using nanoparticles (ie, nanoparticles other than nanocellulose), modification with inorganics or surfactants, or biochemical modification.
[0108] Certain variations provide a process for producing a nanocellulose material, the process comprising: (a) the provision of a lignocellulosic biomass feedstock; (b) the fractionation of the raw material in the presence of sulfur dioxide, a solvent for lignin, and water, to generate solids rich in cellulose and a liquid containing oligomers of hemicellulose and lignin, in which the crystallinity of solids rich in cellulose is at least 70%, wherein the SO2 concentration is from about 10% by weight to about 50% by weight, the fractionating temperature is from about 130°C to about 200°C, and the fractionation time is about 30 minutes to about 4 hours; (c) mechanical treatment of cellulose rich solids to form cellulose fibrils and/or cellulose crystals, thereby generating a nanocellulose material having a crystallinity of at least 70%; and (d) the recovery of the nanocellulose material.
[0109] In some embodiments, the concentration of SO2 is from about 12% by weight to about 30% by weight. In some embodiments, the fractionation temperature is from about 140°C to about 170°C. In some embodiments, the splitting time is from about 1 hour to about 2 hours. The process can be controlled such that, during step (b), a portion of the solubilized lignin intentionally deposits back onto a surface of the cellulose rich solids, thus making the cellulose rich solids at least partially hydrophobic.
[0110] A significant factor limiting the application of lightweight strength-enhancing nanocellulose in composites is the inherent hydrophobicity of cellulose. Surface modification of the surface of nanocellulose to impart hydrophobicity to allow uniform dispersion in a hydrophobic polymer matrix is an active area of study. It was discovered that, when preparing nanocellulose using the processes described in this document, lignin can condense in the pulp or under certain conditions, giving rise to an increase in the Kappa number and the production of a brown or black material. Lignin increases the hydrophobicity of the nanocellulose precursor material, and this hydrophobicity is retained during mechanical treatment, as long as the lignin is not removed through bleaching or other steps. (Some bleaching can still be carried out, either to adjust the lignin content or to attack a certain type of lignin, for example.)
[0111] In some embodiments, the present invention provides a process for producing a hydrophobic nanocellulose material, the process comprising: (a) the provision of a lignocellulosic biomass feedstock; (b) the fractionation of the raw material in the presence of an acid, a solvent for lignin, and water, to generate cellulose-rich solids and a liquid containing hemicellulose and lignin, in which a portion of the lignin deposits on a surface of the solids cellulose-rich, thus making the cellulose-rich solids at least partially hydrophobic; (c) mechanical treatment of cellulose rich solids to form cellulose fibrils and/or cellulose crystals, thereby generating a hydrophobic nanocellulose material having a crystallinity of at least 60%; and (d) recovering the hydrophobic nanocellulose material.
[0112] In some embodiments, the acid is selected from the group consisting of sulfur dioxide, sulfurous acid, sulfur trioxide, sulfuric acid, lignosulfonic acid, and combinations thereof.
[0113] In some embodiments, during step (c), the cellulose-rich solids are treated with a total mechanical energy of less than about 1000 kilowatt hours per ton of the cellulose-rich solids, such as less than about 500 kilowatts -hours per ton of cellulose-rich solids.
[0114] The crystallinity of the nanocellulose material is at least 70% or at least 80%, in various embodiments.
[0115] Nanocellulose material can include nanofibrillated cellulose, nanocrystalline cellulose, or both nanofibrillated and nanocrystalline cellulose. The nanocellulose material can be characterized by an average degree of polymerization of from about 100 to about 1500, such as from about 300 to about 700, or from about 150 to about 250, for example (without limitation).
[0116] Step (b) may include process conditions such as prolonged time and/or temperature (for example, see FIGURE 6), or lower solvent concentration for lignin, which tends to promote lignin deposition on fibers . Alternatively, or in addition, step (b) may include one or more washing steps that are adapted to deposit at least part of the lignin that has been solubilized during the initial fractionation. One approach is to wash with water rather than a water and solvent solution. Because lignin is generally not soluble in water, it will start to precipitate. Optionally, other conditions can be varied, such as pH and temperature, during the fractionation, washing or other steps, to optimize the amount of lignin deposited on the surfaces. It is observed that, for the surface concentration of lignin to be greater than the internal concentration, the lignin must first be pulled into solution and then redeposited; internal lignin (within nanocellulose particles) does not increase hydrophobicity in the same way.
[0117] Optionally, the process for producing a hydrophobic nanocellulose material can additionally include chemical modification of lignin to increase the hydrophobicity of the nanocellulose material. The chemical modification of lignin can be conducted during step (b), step (c), step (d), after step (d), or some combination.
[0118] High lignin loading rates have been achieved in thermoplastics. Even higher loading rates are achieved with well-known lignin modifications. The preparation of useful polymeric materials containing a substantial amount of lignin has been the subject of investigation for over thirty years. Typically, lignin can be blended into polyolefins or polyesters by extrusion at up to 25 to 40% by weight while satisfying the mechanical characteristics. To increase the compatibility between lignin and other hydrophobic polymers, different approaches have been used. For example, chemical modification of lignin can be accomplished through esterification with long-chain fatty acids.
[0119] Any known chemical modifications can be performed on lignin, to further enhance the hydrophobic nature of the lignin-coated nanocellulose material provided by the embodiments of this invention.
[0120] The present invention also provides, in some variations, a process to produce a product containing nanocellulose, the process comprising: (a) the provision of a raw material of lignocellulosic biomass; (b) fractionating the raw material in the presence of an acid, a solvent for lignin, and water, to generate cellulose-rich solids and a liquid containing hemicellulose and lignin; (c) mechanical treatment of cellulose rich solids to form cellulose fibrils and/or cellulose crystals, thereby generating a nanocellulose material having a crystallinity of at least 60%; and (d) incorporating at least a portion of the nanocellulose material into a nanocellulose-containing product.
[0121] The product containing nanocellulose includes the nanocellulose material, or a treated form thereof. In some embodiments, the nanocellulose-containing product consists essentially of the nanocellulose material.
[0122] In some embodiments, step (d) comprises the formation of a structural object that includes the nanocellulose material, or a derivative thereof.
[0123] In some embodiments, step (d) comprises the formation of a foam or an airgel that includes the nanocellulose material, or a derivative thereof.
[0124] In some embodiments, step (d) comprises combining the nanocellulose material, or a derivative thereof, with one or more materials to form a composite. For example, the other material can include a polymer selected from polyolefins, polyesters, polyurethanes, polyamides, or combinations thereof. Alternatively, or in addition, the other material may include carbon in various forms.
[0125] The nanocellulose material incorporated into a nanocellulose-containing product can be at least partially hydrophobic by depositing at least part of the lignin onto a surface of the cellulose-rich solids during step (b). Furthermore, the nanocellulose material can be at least partially hydrophobic by depositing at least part of the lignin onto a surface of the nanocellulose material during step (c) or step (d).
[0126] In some embodiments, step (d) comprises forming a film comprising the nanocellulose material, or a derivative thereof. The film is optically transparent and flexible in certain embodiments.
[0127] In some embodiments, step (d) comprises forming a coating or coating precursor comprising the nanocellulose material, or a derivative thereof. In some embodiments, the nanocellulose-containing product is a paper coating.
[0128] In some embodiments, the nanocellulose-containing product is configured as a catalyst, catalyst substrate, or co-catalyst. In some embodiments, the nanocellulose-containing product is electrochemically configured to carry or store an electrical current or voltage.
[0129] In some embodiments, the product containing nanocellulose is incorporated into a filter, membrane, or other separation device.
[0130] In some embodiments, the nanocellulose-containing product is incorporated as an additive in a coating, a paint, or an adhesive. In some embodiments, the nanocellulose-containing product is incorporated as a cement additive.
[0131] In some embodiments, the product containing nanocellulose is incorporated as a thickening agent or rheological modifier. For example, the nanocellulose-containing product can be an additive in a drilling fluid, such as (among others) an oil recovery fluid and/or a gas recovery fluid.
[0132] The present invention also provides nanocellulose compositions. In some variations, a nanocellulose composition comprises nanofibrillated cellulose having a cellulose crystallinity of about 70% or greater. The nanocellulose composition can include lignin and sulfur.
[0133] The nanocellulose material may additionally contain a certain amount of sulfonated lignin that is derived from sulfonation reactions with SO2 (when used as the acid in fractionation) during digestion of the biomass. The amount of sulfonated lignin can be about 0.1% by weight (or less), 0.2% by weight, 0.5% by weight, 0.8% by weight, 1% by weight, or more. Furthermore, without being bound by any theory, it is speculated that a small amount of sulfur may chemically react with the cellulose itself, in some embodiments.
[0134] In some variations, a nanocellulose composition comprises nanofibrillated cellulose and nanocrystalline cellulose, wherein the nanocellulose composition is characterized by an overall cellulose crystallinity of about 70% or more. The nanocellulose composition can include lignin and sulfur.
[0135] In some variations, a nanocellulose composition comprises nanocrystalline cellulose with a cellulose crystallinity of about 80% or more, wherein the nanocellulose composition comprises lignin and sulfur.
[0136] In some embodiments, the crystallinity of cellulose is about 75% or greater, such as about 80% or greater, or about 85% or greater. In several embodiments, the nanocellulose composition is not derived from tunicates.
[0137] The nanocellulose composition of some embodiments is characterized by an average degree of cellulose polymerization from about 100 to about 1000, such as from about 300 to about 700, or from about 150 to about 250. In certain embodiments, the nanocellulose composition is characterized by a cellulose polymerization degree distribution having a single peak. In certain embodiments, the nanocellulose composition is enzyme free.
[0138] Other variations provide a hydrophobic nanocellulose composition with a cellulose crystallinity of about 70% or more, wherein the nanocellulose composition contains nanocellulose particles having a surface concentration of lignin that is greater than an internal concentration (internal particles ) of lignin. In some embodiments, there is a coating or thin film of lignin on nanocellulose particles, but the coating or film need not be uniform.
[0139] The hydrophobic nanocellulose composition may have a cellulose crystallinity of about 75% or greater, about 80% or greater, or about 85% or greater. The hydrophobic nanocellulose composition can additionally include sulfur.
[0140] The composition of hydrophobic nanocellulose may or may not be derived from tunicates. The hydrophobic nanocellulose composition can be enzyme free.
[0141] In some embodiments, the hydrophobic nanocellulose composition is characterized by an average degree of cellulose polymerization of about 100 to about 1500, such as from about 300 to about 700, or from about 150 to about 250. The nanocellulose composition can be characterized by a cellulose polymerization degree distribution having a single peak.
[0142] A product containing nanocellulose may include any of the disclosed nanocellulose compositions. Many products containing nanocellulose are possible. For example, a nanocellulose-containing product can be selected from the group consisting of a structural object, a foam, an airgel, a polymer composite, a carbon composite, a film, a coating, a coating precursor, a current carrier, or strain, a filter, a membrane, a catalyst, a catalyst substrate, a coating additive, a paint additive, an adhesive additive, a cement additive, a paper coating, a thickening agent, a rheological modifier, a additive to a drilling fluid, and combinations or derivatives thereof.
[0143] Some variations provide a nanocellulose material produced by a process comprising: (a) the provision of a lignocellulosic biomass feedstock; (b) fractionating the raw material in the presence of an acid, a solvent for lignin, and water, to generate cellulose-rich solids and a liquid containing hemicellulose and lignin; (c) mechanical treatment of cellulose rich solids to form cellulose fibrils and/or cellulose crystals, thereby generating a nanocellulose material having a crystallinity of at least 60%; and (d) the recovery of the nanocellulose material.
[0144] Some embodiments provide a polymer-nanocellulose composite material produced by a process comprising: (a) the provision of a lignocellulosic biomass feedstock; (b) fractionating the raw material in the presence of an acid, a solvent for lignin, and water, to generate cellulose-rich solids and a liquid containing hemicellulose and lignin; (c) mechanical treatment of cellulose rich solids to form cellulose fibrils and/or cellulose crystals, thereby generating a nanocellulose material having a crystallinity of at least 60%; (d) recovery of the nanocellulose material; (e) the fermentation of hemicellulose derived sugars from hemicellulose to produce a monomer or precursor thereof; (f) polymerizing the monomer to produce a polymer; and (g) combining the polymer and the nanocellulose material to form the polymer-nanocellulose composite.
[0145] Some variations provide a nanocellulose material produced by a process comprising: (a) the provision of a lignocellulosic biomass feedstock; (b) the fractionation of the raw material in the presence of sulfur dioxide, a solvent for lignin, and water, to generate solids rich in cellulose and a liquid containing oligomers of hemicellulose and lignin, in which the crystallinity of solids rich in cellulose is at least 70%, wherein the SO2 concentration is from about 10% by weight to about 50% by weight, the fractionating temperature is from about 130°C to about 200°C, and the fractionation time is about 30 minutes to about 4 hours; (c) mechanical treatment of cellulose rich solids to form cellulose fibrils and/or cellulose crystals, thereby generating a nanocellulose material having a crystallinity of at least 70%; and (d) the recovery of the nanocellulose material.
[0146] Some variations provide a hydrophobic nanocellulose material produced by a process comprising: (a) the provision of a lignocellulosic biomass feedstock; (b) the fractionation of the raw material in the presence of an acid, a solvent for lignin, and water, to generate cellulose-rich solids and a liquid containing hemicellulose and lignin, in which a portion of the lignin deposits on a surface of the solids cellulose-rich, thus making the cellulose-rich solids at least partially hydrophobic; (c) mechanical treatment of cellulose rich solids to form cellulose fibrils and/or cellulose crystals, thereby generating a hydrophobic nanocellulose material having a crystallinity of at least 60%; and (d) the recovery of the hydrophobic nanocellulose material.
[0147] Some variations provide a product containing nanocellulose produced by a process comprising: (a) the provision of a raw material of lignocellulosic biomass; (b) fractionating the raw material in the presence of an acid, a solvent for lignin, and water, to generate cellulose-rich solids and a liquid containing hemicellulose and lignin; (c) mechanical treatment of cellulose rich solids to form cellulose fibrils and/or cellulose crystals, thereby generating a nanocellulose material having a crystallinity of at least 60%; and (d) incorporating at least a portion of the nanocellulose material into a nanocellulose-containing product.
[0148] A nanocellulose-containing product that contains nanocellulose material can be selected from the group consisting of a structural object, a foam, an airgel, a polymer composite, a carbon composite, a film, a coating, a coating precursor , a current or voltage carrier, a filter, a membrane, a catalyst, a catalyst substrate, a coating additive, a paint additive, an adhesive additive, a cement additive, a paper coating, a thickening agent , a rheological modifier, an additive to a drilling fluid, and combinations or derivatives thereof.
[0149] Some process variations can be understood by referring to FIGURES 1 through 4. Dotted lines denote optional flows. Several embodiments will now be described, without limitation as to the scope of the invention. These achievements are exemplary in nature.
[0150] In some embodiments, a first process step is "cooking" (similarly, "digest"), which fractionates the three lignocellulosic material components (cellulose, hemicellulose, and lignin) to allow for easy downstream removal. Specifically, hemicelluloses are dissolved and more than 50% is completely hydrolyzed; the cellulose is separated but remains resistant to hydrolysis; and the lignin part is sulfonated to water soluble lignosulfonates.
[0151] The lignocellulosic material is processed in a solution (cooking liquid) of aliphatic alcohol, water, and sulfur dioxide. The cooking liquid preferably contains at least 10% by weight, such as at least 20% by weight, 30% by weight, 40% by weight, or 50% by weight of a solvent for lignin. For example, the cooking liquid can contain about 30 to 70% by weight of solvent, such as about 50% by weight of solvent. The solvent for lignin can be an aliphatic alcohol, such as methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, isobutanol, 1-pentanol, 1-hexanol, or cyclohexanol. The solvent for lignin can be an aromatic alcohol such as phenol or cresol. Other lignin solvents are possible, such as, among others (among others) glycerol, methyl ethyl ketone, or diethyl ether. Combinations of more than one solvent can be used.
[0152] Preferably, sufficient solvent is included in the extraction mixture to dissolve the lignin present in the raw material. The solvent for lignin can be completely miscible, partially miscible, or immiscible with water, so that there can be more than one liquid phase. Possible process advantages arise when the solvent is miscible with water, and also when the solvent is immiscible with water. When the solvent is miscible with water, a single liquid phase is formed, so lignin mass transfer and hemicellulose extraction are improved, and the downstream process must only handle one liquid flow. When the solvent is immiscible in water, the extraction mixture readily separates to form liquid phases, so a separate separation step can be avoided or simplified. This can be advantageous if one liquid phase contains most of the lignin and the other contains most of the hemicellulose sugars, as this facilitates the recovery of lignin from the hemicellulose sugars.
[0153] The cooking liquid preferably contains sulfur dioxide and/or sulfurous acid (H2SO3). The cooking liquid preferably contains SO2 in dissolved or reacted form in a concentration of at least 3% by weight, preferably at least 6% by weight, more preferably at least 8% by weight, such as about 9% by weight. weight, 10% by weight, 11% by weight, 12% by weight, 13% by weight, 14% by weight, 15% by weight, 20% by weight, 25% by weight, 30% by weight or more. The cooking liquid can also contain one or more species, apart from SO2, to adjust the pH. The pH of the cooking liquid is typically around 4 or less.
[0154] Sulfur dioxide is a preferred acid catalyst because it can be easily recovered from solution after hydrolysis. Most of the SO2 in the hydrolyzate can be removed and recycled back to the reactor. Recovery and recycling translates to less time required compared to comparable sulfuric acid neutralization, less solids for disposal, and less separation equipment. The increased efficiency due to the inherent properties of sulfur dioxide means that fewer acidic or other total catalysts may be needed. This has cost advantages as sulfuric acid can be expensive. In addition, and very significantly, less acid usage will also translate into lower costs for a base (eg lime) to raise the pH after hydrolysis for downstream operations. In addition, less acid and less base will also mean substantially less generation of residual salts (eg gypsum) that might otherwise require disposal.
[0155] In some embodiments, an additive may be included in amounts from about 0.1% by weight to 10% by weight or more to increase the viscosity of the cellulose. Exemplary additives include ammonia, ammonium hydroxide, urea, anthraquinone, magnesium oxide, magnesium hydroxide, sodium hydroxide, and their derivatives.
[0156] Cooking is performed in one or more stages using batch or continuous digesters. Solid and liquid can flow concurrently or countercurrently, or in any flow pattern that achieves the desired fractionation. The cooking reactor can be internally stirred if desired.
[0157] Depending on the lignocellulosic material to be processed, cooking conditions are varied, with temperatures from about 65° to 190 °C, eg 75 °C, 85 °C, 95 °C, 105 °C, 115 °C, 125 °C, 130 °C, 135 °C, 140 °C, 145 °C, 150 °C, 155 °C, 165 °C or 170 °C, and corresponding pressures from about 1 atmosphere to about 15 atmospheres in liquid or vapor phase. The cooking time of one or more stages can be selected from about 15 minutes to about 720 minutes, such as about 30, 45, 60, 90, 120, 140, 160, 180, 250, 300, 360, 450 , 550, 600, or 700 minutes. In general, there is an inverse relationship between the temperature used during the digestion step and the time needed to obtain good fractionation of the biomass into its constituent parts.
[0158] The ratio of cooking liquid to lignocellulosic material can be selected from about 1 to about 10, such as about 2, 3, 4, 5 or 6. In some embodiments, biomass is digested in a pressurized vessel with low liquid volume (low cooking liquid to lignocellulosic material ratio) so that the cooking space is filled with ethanol and sulfur dioxide vapor in equilibrium with moisture. The biomass is washed in an alcohol-rich solution to recover the dissolved lignin and hemicelluloses, while the remaining pulp is further processed. In some embodiments, the process of fractionating the lignocellulosic material comprises steam cooking the lignocellulosic material with aliphatic alcohol (or other solvent for lignin), water, and sulfur dioxide. See, for example, U.S. Patent Nos. 8,038,842 and 8,268,125, which are incorporated by reference herein.
[0159] A portion or all of the sulfur dioxide may be present as sulfurous acid in the extraction liquid. In certain embodiments, sulfur dioxide is generated in situ by the introduction of sulfurous acid, sulfite ions, disulfide ions, combinations thereof, or a salt of any of the above. Excess sulfur dioxide after hydrolysis can be recovered and reused.
[0160] In some embodiments, sulfur dioxide is saturated in water (or aqueous solution, optionally with an alcohol) at a first temperature, and hydrolysis is then carried out at a second, generally higher temperature. In some embodiments, sulfur dioxide is undersaturated. In some embodiments, sulfur dioxide is supersaturated. In some embodiments, the sulfur dioxide concentration is selected to achieve a certain degree of lignin sulfonation, such as 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9% , or 10% of the sulfur content. SO2 chemically reacts with lignin to form stable lignosulphonic acids, which can be present in both solid and liquid phases.
[0161] The concentration of sulfur dioxide, additives, and aliphatic alcohol (or other solvent) in the solution and the cooking time can be varied to control the yield of cellulose and hemicellulose in the pulp. The sulfur dioxide concentration and cooking time can be varied to control the yield of lignin versus lignosulfonates in the hydrolyzate. In some embodiments, the sulfur dioxide concentration, temperature, and cooking time can be varied to control the yield of fermentable sugars.
[0162] Once the desired amount of both hemicellulose and solid phase lignin is reached, the liquid and solid phases are separated. The conditions for separation can be selected to minimize or improve reprecipitation of the extracted lignin onto the solid phase. Minimization of lignin reprecipitation is favored by conducting separation or washing at a temperature of at least the lignin glass transition temperature (about 120°C); on the other hand, the improvement of lignin reprecipitation is favored by conducting separation or washing at a temperature lower than the glass transition temperature of lignin.
[0163] Physical separation can be accomplished by transferring the entire mixture to a device that can perform separation and washing, or by removing only one of the reactor phases while keeping the other phase in place. The solid phase can be physically retained by appropriately sized screens through which a liquid can pass. The solid is retained on the screens and can be held there by successive wash cycles. Alternatively, the liquid can be trapped and the solid phase forced out of the reaction zone, with centrifugal or other forces that can effectively transfer the solids out of the suspension. In a continuous system, the countercurrent flow of solids and liquid can carry out physical separation.
[0164] Recovered solids will typically contain a quantity of lignin and sugars, some of which can be easily washed off. The wash liquid composition can be the same or different from the liquid composition used during fractionation. Several washes can be performed to increase effectiveness. Preferably, one or more washes are performed with a composition including a solvent for lignin to remove additional lignin from the solids, followed by one or more washes with water to displace residual solvent and sugars from the solids. Recycle streams, such as from solvent recovery operations, can be used to wash solids.
[0165] After separation and washing as described, a solid phase and at least one liquid phase are obtained. The solid phase contains substantially undigested cellulose. A single liquid phase is generally obtained when the solvent and water are miscible in the relative proportions that are present. In this case, the liquid phase contains, in dissolved form, most of the lignin originally in the lignocellulosic feedstock, as well as monomeric and oligomeric sugars formed in the hydrolysis of any hemicellulose that may have been present. Multiple liquid phases tend to form when solvent and water are completely or partially immiscible. Lignin tends to be contained in the liquid phase which contains most of the solvent. Hemicellulose hydrolysis products tend to be present in the liquid phase which contains most of the water.
[0166] In some embodiments, the hydrolyzate from the cooking step is subjected to pressure reduction. Pressure reduction can be done at the end of a cook in a batch digester, or in a flash tank after extraction from a continuous digester, for example. The flash vapor from the pressure reduction can be collected in a cooking liquid compounding vessel. Flash steam contains substantially all of the unreacted sulfur dioxide, which can be directly dissolved into fresh cooking liquid. The cellulose is then removed to be washed and further treated as desired.
[0167] A washing step of the process recovers the hydrolyzate from the cellulose. Washed cellulose is pulp that can be used for various purposes (eg paper or nanocellulose production). The weak washer hydrolyzate continues to the final reaction step; in a continuous digester, this weak hydrolyzate can be combined with the hydrolyzate extracted from the external flash tank. In some embodiments, washing and/or separating the hydrolyzate and cellulose-rich solids is conducted at a temperature of at least 100°C, 110°C or 120°C. Cellulose can also be used for glucose production through the hydrolysis of cellulose with enzymes or acids.
[0168] In another reaction step, the hydrolyzate can be further treated in one or multiple steps to hydrolyze oligomers into monomers. This step can be carried out before, during, or after removal of solvent and sulfur dioxide. The solution may or may not contain residual solvent (eg alcohol). In some embodiments, sulfur dioxide is added or allowed to pass to this step to aid in hydrolysis. In these or other embodiments, an acid such as sulfurous acid or sulfuric acid is introduced to aid hydrolysis. In some embodiments, the hydrolyzate is self-hydrolyzed by heating under pressure. In some embodiments, no additional acid is introduced, but lignosulfonic acids produced during initial cooking are effective to catalyze the hydrolysis of hemicellulose oligomers to monomers. In various embodiments, this step uses sulfur dioxide, sulfurous acid, sulfuric acid at a concentration of about 0.01% by weight to 30% by weight, such as about 0.05% by weight, 0.1% by weight. weight, 0.5% by weight, 1% by weight, 2% by weight, 5% by weight, 10% by weight, or 20% by weight. This step can be carried out at a temperature of about 100 °C to 220 °C, such as about 110 °C, 120 °C, 130 °C, 140 °C, 150 °C, 160 °C, 170 °C , 180°C, 190°C, 200°C, or 210°C. Heating can be direct or indirect to reach the selected temperature.
[0169] The reaction step produces fermentable sugars, which can then be concentrated by evaporation into a fermentation feedstock. Concentration by evaporation can be carried out before, during, or after treatment to hydrolyze oligomers. The final reaction step may optionally be followed by removing vapor from the resulting hydrolyzate to remove and recover sulfur dioxide and alcohol, and to remove possible fermentation inhibiting by-products. The evaporation process can be under vacuum or pressure, from about -0.1 atmospheres to about 10 atmospheres, such as about 0.1 atm, 0.3 atm, 0.5 atm, 1.0 atm, 1 .5 atm, 2 atm, 4 atm, 6 atm, or 8 atm.
[0170] The recovery and recycling of sulfur dioxide can use separations such as, but not limited to, vapor-liquid removal (eg, by flash), vapor removal, extraction, or combinations, or multiple stages thereof. Various recycling ratios can be practiced, such as 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 0.95, or more. In some embodiments, about 90 to 99% of the initially loaded SO2 is readily recovered by distillation from the liquid phase, with 1 to 10% remaining (eg, about 3 to 5%) of the SO2 primarily bound to the dissolved lignin as a lignosulfonates.
[0171] In a preferred embodiment, the evaporation step uses an alcohol scavenger and integrated evaporator. The evaporated steam streams can be segregated so as to have different concentrations of organic compounds in different streams. Evaporator condensate streams can be segregated so as to have different concentrations of organic compounds in different streams. Alcohol can be removed from the evaporation process by condensing exhaust steam and returning to the cooking liquid make-up bottle in the cooking step. Clean condensate from the evaporation process can be used in the washing step.
[0172] In some embodiments, an integrated evaporator and alcohol scavenger system is employed, in which the aliphatic alcohol is removed by vapor removal, the resulting scavenger product vapor is concentrated by evaporating the water from the vapor, and the vapor Evaporated is compressed using vapor compression and is reused to provide thermal energy.
[0173] The hydrolyzate from the evaporation and the final reaction step contains mainly fermentable sugars, but may also contain lignin, depending on the location of the lignin separation in the general process configuration. The hydrolyzate can be concentrated at a concentration of about 5% by weight to about 60% by weight, such as about 10% by weight, 15% by weight, 20% by weight, 25% by weight, 30% by weight. weight, 35% by weight, 40% by weight, 45% by weight, 50% by weight, or 55% by weight solids. The hydrolyzate contains fermentable sugars.
[0174] Fermentable sugars are defined as hydrolysis products of cellulose, galactoglycomannan, glycomannan, arabinoglucuronoxylans, arabinogalactan, and glucuronoxylans in their respective short chain oligomers and monomer products, i.e. glucose, mannose, galactose, xylose, and . Fermentable sugars can be recovered in purified form, such as a suspension of sugar or dry sugar solids, for example. Any known technique can be employed to recover a sugar suspension or dry the solution to produce dry sugar solids.
[0175] In some embodiments, fermentable sugars are fermented to produce biochemicals or biofuels such as (among others) ethanol, isopropanol, acetone, 1-butanol, isobutanol, lactic acid, succinic acid, or any other fermentation products. A certain amount of the fermentation product can be a microorganism or enzymes, which can be recovered if desired.
[0176] When fermentation employs bacteria, such as Clostridia bacteria, it is best to process and condition the hydrolyzate to raise the pH and remove residual SO2 and other fermentation inhibitors. Residual SO2 (ie, after removing most of it through removal) can be catalytically oxidized to convert sulphite ions to sulphate ions by oxidation. This oxidation can be accomplished by adding an oxidation catalyst, such as FeSO4^7H2O, which oxidizes sulphite ions to sulphate ions, which is a well known practice for acetone/butanol/ethanol (ABE) fermentation. Preferably, residual SO2 is reduced to less than about 100ppm, 50ppm, 25ppm, 10ppm, 5ppm or 1ppm.
[0177] In some embodiments, the process further comprises recovering lignin as a co-product. Sulphonated lignin can also be recovered as a co-product. In certain embodiments, the process further comprises combusting or gassing the sulfonated lignin, recovering the sulfur contained in the sulfonated lignin in a gas stream comprising recovered sulfur dioxide, and then recycling the recovered sulfur dioxide for reuse.
[0178] The lignin separation step of the process is for the separation of lignin from the hydrolyzate and can be located before or after the reaction and final evaporation step. If located later, then the lignin will precipitate from the hydrolyzate as the alcohol has been removed in the evaporation step. The remaining water-soluble lignosulfonates can be precipitated by converting the hydrolyzate to an alkaline condition (pH greater than 7) using, for example, an alkaline earth oxide, preferably calcium oxide (lime). The combined lignin and lignosulfonate precipitate can be filtered. The lignin and lignosulfonate filter cake can be dried as a co-product or burned or gassed for energy production. The hydrolyzate from filtration can be recovered and sold as a concentrated sugar solution product or further processed in a fermentation step, or other later step.
[0179] Native (unsulfonated) lignin is hydrophobic, while lignosulfonates are hydrophilic. Hydrophilic lignosulfonates may have a lesser propensity to clump, agglomerate, and adhere to surfaces. Even lignosulfonates that undergo some condensation and molecular weight increase will still have an HSO3 group that will contribute part of the solubility (hydrophilic).
[0180] In some embodiments, soluble lignin precipitates from the hydrolyzate after the solvent has been removed in the evaporation step. In some embodiments, reactive lignosulfonates are selectively precipitated from the hydrolyzate using excess lime (or other base, such as ammonia) in the presence of aliphatic alcohol. In some embodiments, hydrated lime is used to precipitate lignosulfonates. In some embodiments, some of the lignin is reactively precipitated, and the remainder of the lignin is sulfonated in water-soluble form.
[0181] The fermentation and distillation steps are intended for the production of fermentation products, such as alcohols or organic acids. After removal of cooking chemicals and lignin, and further treatment (oligomer hydrolysis), the hydrolyzate contains mainly fermentable sugars in the water solution, from which any fermentation inhibitors have preferably been removed or neutralized. The hydrolyzate is fermented to produce dilute alcohol or organic acids, concentration 1% by weight to 20% by weight. The diluted product is distilled or otherwise purified as is known in the art.
[0182] When alcohol is produced, such as ethanol, part of it can be used to make up the cooking liquid in the cooking step of the process. Also, in some embodiments, a distillation column flow, such as the bottom, with or without evaporator condensate, can be reused to wash cellulose. In some embodiments, lime can be used to dehydrate the product alcohol. By-products can be removed and recovered from the hydrolyzate. These by-products can be isolated by processing the vent from the final reaction step and/or the condensate from the evaporation step. By-products include furfural, hydroxymethyl furfural (HMF), methanol, acetic acid, and lignin-derived compounds, for example.
[0183] Glucose can be fermented into an alcohol, an organic acid, or other fermentation product. Glucose can be used as a sweetener or isomerized to enrich its fructose content. Glucose can be used to produce baker's yeast. Glucose can be catalytically or thermally converted to various organic acids and other materials.
[0184] When hemicellulose is present in the starting biomass, all or a portion of the liquid phase contains hemicellulose sugars and soluble oligomers. It is preferable to remove most of the lignin from the liquid, as described above, to produce a fermentation broth that will contain water, possibly some of the solvent for lignin, hemicellulose sugars, and various minor components of the digestion process. This fermentation broth can be used directly, combined with one or more other fermentation streams or further treated. Additional treatments may include concentration of sugar by evaporation; the addition of glucose or other sugars (optionally as obtained from saccharification of cellulose); addition of various nutrients, such as salts, vitamins, or trace elements; pH adjustment; and removing fermentation inhibitors such as acetic acid and phenolic compounds. The choice of conditioning steps must be specific to the product(s) and target microorganism(s) used.
[0185] In some embodiments, hemicellulose sugars are not fermented, instead they are recovered and purified, stored, sold, or converted into a special product. Xylose, for example, can be converted to xylitol.
[0186] A lignin product can be readily obtained from a liquid phase using one or more of several methods. A simple technique is to evaporate all the liquid, resulting in a solid lignin-rich residue. This technique would be especially advantageous if the solvent for lignin is immiscible with water. Another method is to make the lignin precipitate out of solution. Some of the ways to precipitate lignin include (1) removing the solvent for lignin from the liquid phase but not the water, such as selectively evaporating the solvent from the liquid phase until the lignin is no longer soluble; (2) dilute the liquid phase with water until the lignin is no longer soluble; and (3) adjust the temperature and/or pH of the liquid phase. Methods such as centrifugation can then be used to capture the lignin. Yet another technique to remove lignin is continuous liquid-liquid extraction to selectively remove lignin from the liquid phase, followed by removal of the extraction solvent to recover relatively pure lignin.
[0187] The lignin produced according to the invention can be used as a fuel. As a solid fuel, lignin is similar in energy content to coal. Lignin can act as an oxygenated component in liquid fuels to improve octane rating while meeting renewable fuel standards. The lignin produced in this document can also be produced as a polymeric material, and as a chemical precursor to produce lignin derivatives. Sulphonated lignin can be sold as a lignosulphonate product, or burned for fuel value.
[0188] The present invention also provides systems configured to carry out the disclosed processes, and compositions produced from them. Any stream generated by the disclosed processes can be partially or completely recovered, purified or further treated, and/or marketed or sold.
[0189] Certain products containing nanocellulose provide high transparency, good mechanical strength, and/or better gas barrier properties (eg O2 or CO2), for example. Certain nanocellulose containing products containing hydrophobic nanocellulose materials provided herein may be useful as anti-wetting and anti-freeze coatings, for example.
[0190] Due to the low input of mechanical energy, the products containing nanocellulose provided in this document can be characterized by fewer defects that normally result from intense mechanical treatment.
[0191] Some realizations provide nanocellulose containing products with applications for sensors, catalysts, antimicrobial materials, current carrying capabilities and energy storage. Cellulose nanocrystals have the ability to aid in the synthesis of metal and semiconductor nanoparticle chains.
[0192] Some embodiments provide composites containing nanocellulose and a material containing carbon, such as (among others) lignin, graphite, graphene, or carbon aerogels.
[0193] Cellulose nanocrystals can be coupled with the stabilizing properties of surfactants and explored for the manufacture of nanoarchitectures of various semiconductor materials.
[0194] The reactive surface of secondary -OH groups on nanocellulose facilitates the grafting of chemical species to achieve different surface properties. Surface functionalization allows adaptation of particle surface chemistry to facilitate self-assembly, controlled dispersion within a wide range of matrix polymers, and control of the bond strength of both particle-particle and particle-matrix. Composites can be transparent, have greater tensile strength than cast iron, and have a very low coefficient of thermal expansion. Potential applications include, among others, barrier films, antimicrobial films, clear films, flexible screens, polymer reinforcement fillers, biomedical implants, pharmaceuticals, drug delivery, fibers and textiles, models for electronic components, separation membranes, batteries , supercapacitors, electroactive polymers, and many others.
[0195] Other nanocellulose applications suitable for the present invention include reinforced polymers, high strength spun fibers and textiles, advanced composite materials, films for barrier and other properties, coating additives, inks, varnishes and adhesives, switchable optical devices, pharmaceuticals and drug delivery systems, bone replacement and tooth repair, improved role, packaging and construction properties, food and cosmetic additives, catalysts, and hydrogels.
[0196] Aerospace and transport composites can benefit from high crystallinity. Automotive applications include composites of nanocellulose with polypropylene, polyamide (eg Nylons), or polyesters (eg PBT).
[0197] The materials provided in this document are suitable as strength enhancing additives for renewable and biodegradable composites. Nanofibrillary cellulosic structures can function as a binder between two organic phases for improved fracture resistance and cracking prevention for application in packaging, building materials, appliances, and renewable fibers.
[0198] The nanocellulose materials provided in this document are suitable as transparent and dimensional stable strength enhancing additives and substrates for application in flexible screens, flexible circuits, printable electronics, and flexible solar panels. Nanocellulose is incorporated into substrate sheets formed by vacuum filtration, pressure dried and calendered, for example. In a sheet structure, nanocellulose acts as a glue between the filler aggregates. The formed calendered sheets are smooth and flexible.
[0199] The nanocellulose materials provided in this document are suitable for composites and cement additives, allowing for crack reduction and greater strength and strength. Foamed cellular nanocellulose-concrete hybrid materials allow lightweight structures with greater crack reduction and strength.
[0200] The strength improvement with nanocellulose increases both the bond area and the bond strength for application in high strength, high volume and high filler paper and board with better moisture and oxygen barrier properties. The pulp and paper industry, in particular, can benefit from nanocellulose materials provided in this document.
[0201] Nanofibrillated cellulose nanopaper has a higher density and greater tensile mechanical properties than conventional paper. It can also be optically transparent and flexible, with low thermal expansion and excellent oxygen barrier characteristics. The functionality of nanopaper can be further enhanced by incorporating other entities, such as carbon nanotubes, nanoclay, or a conductive polymeric coating.
[0202] Porous nanocellulose can be used for cell bioplastics, insulation and plastics and bioactive membranes and filters. Highly porous nanocellulose materials are generally of high interest in the fabrication of filtration media as well as for biomedical applications, eg in dialysis membranes.
[0203] The nanocellulose materials provided in this document are suitable as coating materials, as they are expected to have a high oxygen barrier and affinity to wood fibers for application in food packaging and paper printing.
[0204] The nanocellulose materials provided in this document are suitable as additives to improve ink durability, protect inks and varnishes from wear caused by UV radiation.
[0205] The nanocellulose materials provided in this document are suitable as thickening agents in food and cosmetic products. Nanocellulose can be used as a dimensionally stable thixotropic biodegradable thickener (stable against temperature and salt addition). The nanocellulose materials provided in this document are suitable as a Pickering-type stabilizer for emulsions and particle-stabilized foam.
[0206] The large surface area of these nanocellulose materials in combination with their biodegradability makes them attractive materials for mechanically stable porous aerogels. Nanocellulose aerogels exhibit a porosity of 95% or more, and they are ductile and flexible.
[0207] Drilling fluids are fluids used in drilling in the oil and natural gas industries, as well as other industries that use large drilling equipment. Drilling fluids are used to lubricate, provide hydrostatic pressure, and keep the bit cool, and the hole as clean as possible from drill cuttings. The nanocellulose materials provided in this document are suitable as additives for these drilling fluids. EXAMPLES EXAMPLE 1: PRODUCTION OF CELLULOSE NANOFIBRILS AND CELLULOSE NANOCRYSTALS.
[0208] Eucalyptus chips (30 grams wet; 46% by weight moisture) were cooked in a 250 ml reactor in a hot oil bath with 12% SO2, 56% by weight ethanol, and a liquid ratio for biomass of 6. The fractionation chemicals solution was composed of 49.2 g of 95% by weight ethanol solution, 23.5 g of distilled water, and 10.4 g of SO2. Time and temperature were varied to study the effect on the degree of polymerization, particle morphology, and mechanical energy consumption for the final fibrillation step.
[0209] The following conditions were studied: Fractionation temperature 145 °C, fractionation time 45 min Fractionation temperature 145 °C, fractionation time 60 min Fractionation temperature 165 °C, fractionation time 15 min Fractionation temperature 165° C, fractionation time 30 min Fractionation temperature 165 °C, fractionation time 45 min Fractionation temperature 165 °C, fractionation time 60 min Fractionation temperature 165 °C, fractionation time 75 min Fractionation temperature 165 °C, fractionation time 90 min
[0210] After fractionation, the pulp (cellulose-rich solids) was washed with 100 g of ethanol/water 50% by weight (twice) at 60 °C followed by 500 ml of distilled water (twice) at room temperature . Washed pulp (washed cellulose-rich solids) was analyzed for Kappa number and degree of polymerization.
[0211] The washed pulp was then bleached using a DEpD sequence. For example, the pulp washed after treatment at 145 °C and 45 min had a Kappa number of 8. In the first bleaching stage, chlorine dioxide was added at 0.65% by weight charge to a 10% pulp suspension. . In the second stage, sodium hydroxide was added at a 2.00% charge to a 12% suspension in the pulp, with “hydrogen peroxide at a 0.5% charge to the pulp. In the final stage, chlorine dioxide was added at 1% by weight charge to a 10% pulp suspension. The bleached pulp was analyzed for yield and degree of polymerization. It was found that the degree of polymerization slightly increased after bleaching as small cellulose fragments are removed.
[0212] For each treatment condition, a 0.65% by weight suspension of bleached pulp was made and passed through a Microfluidics (Westwood, Massachusetts, USA) M-110EH-30 microfluidizer processor for up to 30 passes using a combination of interaction chambers with internal diameters of 87 µm, 200 µm, and 400 µm, depending on the level of size reduction required. A constant pressure of up to 30 kpsi was supplied at a constant rate to the product flow. The interaction chamber's fixed geometry microchannels accelerate product flow at high speed. High shear and impact forces reduce particle size as the high velocity product flow impacts itself and wear resistant surfaces (polycrystalline diamond). A heat exchanger regulates the temperature. Samples were collected at each pass to observe particle morphology by SEM and TEM.
[0213] For example, using the material produced at 145 °C and fractionation time of 45 min, a single pass through the 400 μm chamber resulted in broken fibers. A single pass through the 200 µm and 87 µm chambers resulted in fibers and fibrils. Five passes through the 200 µm and 87 µm chambers resulted in fibrils as shown by SEM. More passes through chambers were made to show greater fibrillation. This result demonstrated that cellulose nanofibrils can be produced starting from the fractionation of 145° biomass, 45 min, and 12% SO2 in water and a solvent for lignin. Energy consumption was estimated at around 860 kWh/ton.
[0214] Using the material produced at 165 °C and fractionation time of 15 min, a single pass through the 400 μm and 200 μm chambers resulted in fibers and fibrils. Five or ten passes through the 200 µm and 87 µm chambers resulted in fibrils and whiskers. Thirty passes through the 200 μm and 87 μm chambers resulted in mostly whiskers, as observed by SEM.
[0215] Using the material produced at 165 °C and fractionation time of 90 min, five passes through the 200 μm chamber resulted in crystals. Five or thirty passes through the 200 µm and 87 µm chambers resulted in crystals. This result demonstrated that cellulose nanocrystals can be produced starting from 165° biomass fractionation, 90 min, and 12% SO2 in water and a solvent for lignin. Energy consumption has been estimated to be around 370 kWh/ton, although it is believed that less energy may be needed with fewer passes through the interaction chambers.
[0216] Figure 5 is a graph showing nanocellulose experimental polymerization degree versus fractionation time, in this Example 1. Figure 6 is a graph showing nanocellulose experimental Kappa number versus fractionation time, in this Example 1. SEM images confirmed that DP is a good predictor for type/length of nanomaterial after fibrillation, including mixtures of nanofibrils and nanocrystals.
[0217] Figure 7 is an exemplary scanning electron microscopy image of nanofibrils. Figure 8 is an exemplary scanning electron microscopy image of nanocrystals. Figure 9 is an exemplary transmission electron microscopy image of nanocrystals (whiskers). EXAMPLE 2: PRODUCTION OF NANOCELLULOSE MATERIALS FROM RESINSES.
[0218] The fractionation of softwoods is carried out at 165° for 60 minutes, with 12% by weight of SO2, 56% by weight of ethanol, and a liquid to biomass ratio of 6. Mechanical treatment includes ultrasonication for 10 minutes at 360 W to generate nanocellulose. The crystallinity of cellulose rich solids is estimated to be 86%. The crystallinity of nanocellulose is estimated to be 86%, showing high crystallinity of both the precursor material and nanocellulose, and little or no crystallinity during mechanical treatment. Nanocellulose particles are characterized by an average width of about 20 nm and a length range of about 300 nm to about 1000 nm or more. EXAMPLE 3: PRODUCTION OF NANOCELLULOSE MATERIALS FROM SUGAR CANE STRAW.
[0219] The fractionation of sugarcane straw is carried out at 165° for 60 minutes, with 12% by weight of SO2, 56% by weight of ethanol, and a liquid to biomass ratio of 6. Mechanical treatment includes ultrasonication for 10 minutes at 360 W to generate nanocellulose. The crystallinity of cellulose-rich solids is estimated to be above 80%. The crystallinity of nanocellulose is estimated to be above 80%, showing high crystallinity of both the precursor material and nanocellulose, and little or no crystallinity during mechanical treatment. Nanocellulose particles are characterized by an average width of about 20 nm and a length range of about 300 nm to about 1000 nm or more. EXAMPLE 4: PRODUCTION OF CELLULOSE NANOFIBRILLES COATED WITH LIGNIN
[0220] Eucalyptus chips (30 grams wet; 46% by weight moisture) were cooked in a 250 ml reactor in a hot oil bath at 145 °C for 45 minutes, with 12% SO2, 56% by weight of ethanol, and a liquid to biomass ratio of 6. The fractionation chemicals solution was composed of 49.2 g of 95% by weight ethanol solution, 23.5 g of distilled water, and 10.4 g of SO2. The pulp was washed with 500 ml of distilled water (twice) at room temperature. Dissolved unsulfonated lignin is insoluble in water and precipitates on the surface of the fibers. The measured Kappa number is about 14.5 compared to a Kappa number of 8.0 when the ethanol/water wash is performed (Figure 6). That is, washing with water only aids the deposition of lignin, which is desirable in this case.
[0221] The resulting material was microfluidized at 0.65% by weight, up to 20 passes, as described above. The nanocellulose product was recovered as a dilute solids suspension.
[0222] In this detailed description, reference has been made to multiple embodiments of the invention and non-limiting examples referring to how the invention can be understood and practiced. Other embodiments that do not provide all the features and advantages set forth in this document can be used without departing from the spirit and scope of the present invention. This invention incorporates routine experimentation and optimization of the methods and systems described in this document. Such modifications and variations are considered within the scope of the invention defined by the claims.
[0223] Further achievements and/or description of some of the achievements discussed above can be found in the Appendix to this document.
[0224] All publications, patents, and patent applications cited in this specification are hereby incorporated by reference in their entirety, as if each publication, patent, or patent application were specifically and individually presented in this document.
[0225] When methods and steps described above indicate certain events occurring in a certain order, those skilled in the art will recognize that the order of certain steps can be modified, and that such modifications are in accordance with variations of the invention. Furthermore, certain steps can be performed simultaneously in a parallel process when possible, as well as performed sequentially.
[0226] Therefore, to the extent that there are variations of the invention which are within the spirit of the disclosure or equivalent to the inventions found in the appended claims, the intent is that this patent will cover those variations as well. The present invention is to be limited only to what is claimed.

权利要求:
Claims (12)
[0001]
1. NANOCELLULOSE COMPOSITION, characterized by: (a) comprising nanofibrillated cellulose with a cellulose crystallinity of 70% or greater; and/or. (b) comprising nanofibrillated cellulose and nanocrystalline cellulose, wherein said nanocellulose composition has an overall cellulose crystallinity of 70% or more; and/or (c) comprising nanocrystalline cellulose having a cellulose crystallinity of 80% or more, wherein said nanocellulose composition comprises lignin and sulfur; and/or (d) be hydrophobic with a cellulose crystallinity of 70% or more, wherein the nanocellulose composition contains nanocellulose particles having a lignin surface concentration that is greater than the internal linin concentration, and that said concentration lignin surface includes precipitated lignin, wherein said cellulose is nanofibrillated, and/or nanocrystalline cellulose, and/or nanocellulose particles, and whose particle diameters range between 0.01 nm and 1000 nm.
[0002]
2. NANOCELLULOSE COMPOSITION, according to claim 1, characterized in that said cellulose crystallinity is 75% or higher.
[0003]
3. NANOCELLULOSE COMPOSITION, according to claim 2, characterized in that said cellulose crystallinity is 80% or higher.
[0004]
4. NANOCELLULOSE COMPOSITION, according to any one of claims 1 to 2, characterized in that said cellulose crystallinity is 85% or higher.
[0005]
5. NANOCELLULOSE COMPOSITION, according to claim 1, characterized in that it comprises lignin.
[0006]
6. NANOCELLULOSE COMPOSITION, according to claim 1, characterized in that it comprises sulfur.
[0007]
7. NANOCELLULOSE COMPOSITION, according to claim 1, characterized in that it is not derived from tunicates.
[0008]
8. NANOCELLULOSE COMPOSITION according to claim 1, characterized in that it comprises an average degree of cellulose polymerization of 100 to 1000, and/or an average degree of cellulose polymerization of 300 to 700, and/or a degree of medium cellulose polymerization from 150 to 250.
[0009]
9. NANOCELLULOSE COMPOSITION, according to claim 1, characterized in that it comprises a cellulose polymerization degree distribution having a single peak.
[0010]
10. NANOCELLULOSE COMPOSITION, according to claim 1, characterized in that it is free of enzymes.
[0011]
11. PRODUCT CONTAINING NANOCELLULOSE, characterized in that it comprises the composition of nanocellulose, as defined in claim 1.
[0012]
12. PRODUCT CONTAINING NANOCELLULOSE, according to claim 11, characterized in that said product containing nanocellulose is selected from the group consisting of a structural object, a foam, an airgel, a polymer composite, a carbon composite, a film, a coating , a coating precursor, a current or voltage carrier, a filter, a membrane, a catalyst, a catalyst substrate, a coating additive, a paint additive, an adhesive additive, a cement additive, a coating of paper, a thickening agent, a rheological modifier, an additive to a drilling fluid, and/or combinations or derivatives thereof.

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US10906994B2|2021-02-02|

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EP2925789B1|2018-07-04|

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EP2925788A1|2015-10-07|

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CN104955848B|2019-11-08|

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ZA201504665B|2016-11-30|

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CN110734582A|2020-01-31|

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RU2015122025A|2017-01-13|

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US20160237173A1|2016-08-18|

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US20190100604A1|2019-04-04|

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BR112014000862A2|2017-12-12|

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PT2925789T|2018-10-31|

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BR112014000864A2|2017-12-12|

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US10093748B2|2018-10-09|

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MY175459A|2020-06-29|

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JP2016500379A|2016-01-12|

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AU2013352015A1|2015-06-11|

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EP2925788A4|2016-06-08|

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CN104955849A|2015-09-30|

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法律状态:
2017-06-20| B11A| Dismissal acc. art.33 of ipl - examination not requested within 36 months of filing|

---

2017-08-15| B11N| Dismissal: publication cancelled [chapter 11.14 patent gazette]|

---

2018-03-06| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

---

2018-03-13| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

---

2018-03-20| B06I| Publication of requirement cancelled [chapter 6.9 patent gazette]|Free format text: ANULADA A PUBLICACAO CODIGO 6.6.1 NA RPI NO 2462 DE 13/03/2018 POR TER SIDO INDEVIDA. |

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2018-10-23| B08F| Application dismissed because of non-payment of annual fees [chapter 8.6 patent gazette]|Free format text: REFERENTE A 5A ANUIDADE. |

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2019-02-12| B08G| Application fees: restoration [chapter 8.7 patent gazette]|

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2019-02-19| B11A| Dismissal acc. art.33 of ipl - examination not requested within 36 months of filing|

---

2019-05-14| B04C| Request for examination: application reinstated [chapter 4.3 patent gazette]|

---

2020-01-07| B25D| Requested change of name of applicant approved|Owner name: GRANBIO INTELLECTUAL PROPERTY HOLDINGS, LLC (US) |

---

2020-01-28| B25G| Requested change of headquarter approved|Owner name: GRANBIO INTELLECTUAL PROPERTY HOLDINGS, LLC (US) |

---

2020-03-10| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

---

2020-10-06| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|

---

2021-03-02| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

---

2021-05-25| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 28/11/2013, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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US201361838985P| true| 2013-06-25|2013-06-25|

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US201361897156P| true| 2013-10-29|2013-10-29|

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