• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a process for removing extractives in the production of pulp, characterized in that a cellulosic material is heated in the presence of cooking liquor formed by adding cooking liquid. also provides a cooking liquor comprising white liquor and soap oil to an inventive soap oil for use in the manufacture of pulp and in addition a resinous pulp prepared by removing extractives in the presence of soap oil. The use of soap oil for resin control, i.e. for removing extraction solvents, in the invention. The invention further relates to a process for producing resin resin, characterized by the steps of adding a cellulosic material to a digester, mixing soap oil with cooking liquid and carrying out heating of said cellulosic material in the presence of a mixture of soap oil and cooking liquid.
    公开号:SE1050325A1
    申请号:SE1050325
    申请日:2010-04-01
    公开日:2010-10-04
    发明作者:Kenneth Winberg；Tero Virkkala；Simon Fagerudd；Teuvo Pietilae；Kaj Nordbaeck；Sven Westin
    申请人:Upm Kymmene Oyj；
    IPC主号:
    专利说明:

    Extractants are partly soluble in water and partly in organic solvents. In hardwood the amount of extractives is about 3-8% by weight and in softwood about 5-10% by weight. The content of extractives that are soluble in organic solvents is on average about 2-10% by weight, depending on the type of wood. During the sulphate boiling, most of the extractives present in the wood in the aqueous solution, such as resins, are saponified and released.
    Extractives in softwood are released relatively easily, but extractives, especially in hardwood, often remain due to their low saponification. The extraction content of bleached birch cellulose is usually from 0.3 to 1.0% by weight per tonne of air-dried pulp, but depends on, for example, the chemicals used for bleaching. If ozone is used as a bleaching agent, the content of extractives can be as low as 0.2% by weight per tonne of air-dried pulp.
    These extractives that remain in the fibers run through all stages of the process, such as boiling, washing, screening, o-delignification and bleaching, thus causing problems especially in paper machines, in which extractives block sieves and blankets and can also reduce the brightness of the pulp. . In addition, extractives cause dirt particles, so-called stickies or sticky components, in the paper web, especially when hardwood, such as birch, is used as a raw material. Pulp with a high resin content can possibly lead to paper damage, such as breaks, holes and dots.
    It has extractives in the production of pulp. A number of different approaches have been proposed for the removal of Four types of commonly used basic resin control approaches are dispersion, adsorption, flocculation and release. Upon dispersion, the resin particles are stabilized by adding dispersants to protect the colloidal activity. Finally, the resin particles are washed from the system. When adsorbed, resin particles are adsorbed using inorganic minerals. The adsorbed resin will be passed through the systems as part of the product. In flocculation, the resin particles are flocculated by using resin binders. Here, the resin particles in the product are preserved during drainage.
    Upon release, the resin particles are dissolved by means of surfactants, solvents or a combination of surfactants and solvents. The resin content is reduced and the deposition of resin is minimized. How extractives form soap pans, how they are released and how they consume other extractives affects the reaction rate that depends on available reaction surfaces. The reaction rates are also affected by the concentration, temperature, alkalinity and the resulting degree of saponification.
    The problems with cooking hardwood have often been avoided by using crude tall oil to release extractives. A mixture called tall oil soap, ie soaps of resin and fatty acids and neutral, ie unsaponified, material obtained from softwood cooking, can be separated from the black liquor and used for the production of crude tall oil. However, the consumption of sulfuric acid in the acidification of crude pine oil poses an increasing problem for modern pulp mills. The crude pine oil soap can also be used for ejaculation. The crude pine oil soap is easily obtained from, for example, an evaporation plant for black liquor when boiling softwood.
    The handling, in particular the pumping of the tall oil soap, causes problems due to the poor ventilation and strong foaming properties of the tall oil soap. For this reason, the dosage accuracy achieved is poor.
    In addition, resin acids can be used as effective auxiliary removal agents, but since resin acids are derived from crude tall oil by distillation, production costs are high and production can also be a bottleneck for the process as a whole. For example, US 2006/0231791 discloses a wood cooking aid comprising a mixture of fatty acids and resin acids and / or salts thereof obtained by distilling crude tall oil. FI 811605 discloses black liquor soap which is fortified with resin acid soap which is substantially free of fatty acid soaps.
    Patent application WO 2004/015195 describes the use of alkyl alkoxylate surfactants which promote wetting, emulsification and dispersion of the resinous materials in the wood structure. Other proposed methods are the use of black liquor from pine boiling or the use of talc for adsorption of extractives.
    In addition, it is also generally known that storage of the raw material for long periods, several months, reduces the content of extractives in the wood raw material.
    There is still a need to improve the agents (agents) used in pulp removal processes, as many of the agents are expensive and / or difficult to prepare, use or dispense.
    The present invention provides an effective process for removing extractives in the production of pulp without the need for the tall oil soap to be refined into crude tall oil or even further and thereby to avoid the use of sulfuric acid. SUMMARY OF THE INVENTION The present invention relates to a process for removing extractives in the production of pulp. The process comprises heating a cellulosic material, for example wood chips, in the presence of cooking liquor formed by adding soap oil to a cooking liquid. The present invention also relates to a cooking liquor, comprising white liquor and pine soap for use in the production of pulp.
    The present invention also relates to the use of soap oil for resin control. An object of the invention is to provide a method for replacing the use of tall oil for resin control purposes. This is achieved by using soap oil during the cooking stage in the production of pulp.
    A significant advantage of the present invention is the reduced amount of sulfuric acid required, compared to the use of crude tall oil, for the removal of extra active ingredients in sulfate boiling.
    Crude tall oil is usually produced in two steps, i.e. by a first acidification of tall oil soap with an acid which does not contain sulfur, such as, for example, carbon dioxide (carbonic acid), formic acid or acetic acid, and by a second acidification by using sulfuric acid. The amount of sulfuric acid needed is relatively large, usually 180-250 kg of acid per tonne of tall oil, or even up to 250-300 kg of acid per tonne of crude tall oil in batch processes. As the sulfidity rises to an undesirable level and sodium sulfate must be removed, this also leads to increased sodium losses, chemical costs and energy costs for recycling. When crude tall oil is added to the pulp boil, it is saponified back into soap and also consumes a large amount of alkali in the cooking process, i.e. uses relatively large amounts of the cooking chemical (eg NaOH).
    The sulfur intake in that chemical extraction is therefore less if you use soap oil instead of crude tall oil.
    Furthermore, the production of soap oil instead of tall oil directly affects production capacity, especially where the capacity of the tall oil plant can be a bottleneck as tall oil is produced in an integrated industrial plant, optionally with at least two lines and with both softwood and hardwood pulp production. This is especially true for hydrodesulphurization (HDS) processes with gravitational separation of the crude tall oil from the mother liquor. The soap oil is easier to produce because it is an intermediate product. The present invention further relates to a resinous pulp prepared by using soap oil for removing extractives in the production of pulp.
    The process comprises adding soap oil to a cooking liquid and heating a cellulosic material, for example wood chips, in the presence of the cooking cloth thus formed. Paper or board made from the resulting resinous pulp is also encompassed by the present invention.
    The present invention further relates to a process for producing resinous pulp, characterized by the steps of adding a cellulosic material to a digester, mixing soapy oil with a cooking liquid, heating the cellulosic material in the presence of a mixture of soap oil and cooking liquid, and optionally washing the cooked wood pulp. (brown stock) and / or perform one or more bleaching stages and then recover a dehydrated pulp.
    BRIEF DESCRIPTION OF THE FIGURES Fig. 1 shows a schematic flow diagram representing an example of the process for producing resinous pulp.
    DETAILED DESCRIPTION OF THE INVENTION The present invention provides a process for removing extractives in the production of pulp by using soap oil in the boiling stage. By using soap oil for resin control, the resin content is reduced and the resin deposition is minimized. Compared to the use of crude tall oil, the use of sulfuric acid and energy use in recycling decreases.
    The following terms used in the present description and in the present claims have the meaning defined below.
    The term "extractives" is used for varying amounts of components, derived from wood or non-woody materials by extraction. They are soluble in water or organic solvents. The most common extractive groups are resin acid groups, triglyceride groups, sterol ester and steryl ester groups, and the extractives also include phenolic compounds, such as flavonoids and ligans. Wood extract substances mainly appear as complex mixtures of tannins, flavonoids, stilbenes, resin and fatty acids, waxes, sterols and simple sugars and they cause operational and quality problems in the production of pulp and paper. 10 15 20 25 30 35 6 The term “resin” is used for both wood extractants and the deposits caused by these extractives during the cooking and papermaking processes.
    Agglomerates of undissolved extractives are sticky and clog wires and machine blankets and adhere to the press and dryer cylinders during pulp drying and in paper machines.
    The term “ce | u | osamateria |” refers to non-woody and woody cellulosic materials that lived / I "pulpwood" refers to both hardwood and coniferous wood and mixtures thereof. Examples for use are used as raw material in the production of pulp. The term or hardwood and coniferous is birch, pine, spruce, aspen, alder, eucalyptus, acacia, poplar, spruce, larch and hemlock. The non-woody material used as a feedstock for cooking includes e.g. residues from agriculture, grasses and other plant substances. The non-woody material can be straw, leaves, bark, fruit, seeds and flowers or for example bamboo or bagasse.
    The term "resinized pulp" used for the pulp obtained by the present invention refers to a low resin pulp from which extractives have been removed. The "softening stage" means the stage at which wood extracts are removed from the pulp.
    The term "soap oil" is used for the intermediate tall oil obtained as an intermediate in the production of tall oil. Soap oil is made from crude tall oil soap by exposing it to contact with carbon dioxide (or carbon dioxide) to form a mixture comprising partially oxygenated soap, sodium bicarbonate and water. Formic acid or acetic acid can also be used. Soap oil has a pH of about 8.
    The term "active amount" is used for the amount of soap oil which is sufficient to remove extractives in order to obtain a desired level of extractants in the washed and bleached pulp.
    The term "cooking liquid" refers to the cooking chemical used to release the lignin. In the case of sulphate cooking, for example, hardwood chips of hardwood and / or softwood are boiled in the presence of an alkaline cooking liquor, usually white liquor, the main active components of which consist of sodium hydroxide and sodium sulphide.
    The term "cooking liquor" refers to a liquid mixture comprising at least one cooking liquid and soap oil. 10 15 20 25 30 35 7 The term "tall oil" or crude tall oil, also called liquid resin, refers to the acidified tall oil soap comprising resins, unsaponifiable sterols, resin acids (mainly abietic acid and its isomers), fatty acids (mainly palmitic oleic acid, oleic acid) and , some sterols and other alkyl hydrocarbon derivatives. The crude tall oil can be distilled to obtain tall oil resin, pine fatty acids, distilled tall oil, tall oil heads and tall oil pitch.
    The term "boiling phase" is used for the heating of cellulosic material in the presence of cooking liquid.
    The term "ton" as used in the specification and claims refers to the metric ton (tonne).
    An object of the present invention is to provide a process for the removal of extractives from the cellulosic material in which an active amount of soap oil is added to the cooking phase during the pulp cooking. The cellulosic material is heated in the presence of a mixture of cooking liquid and soap oil. The amount of extractives remaining in the pulp before and after bleaching is reduced.
    According to the present invention, soap oil is added to the cooking liquid before the soap oil is exposed to contact with the cellulosic material. The saponification of the soap oil is improved by the alkaline cooking liquid. In an advantageous embodiment of the invention, the cellulosic material consists of wood, advantageously of hardwood or a mixture of hardwood. Most advantageously, the pulpwood consists of birch or a mixture of birch and other hardwood.
    The wood chips or wood pulp can also be derived from birch, pine, spruce, aspen, alder, eucalyptus, acacia, poplar, spruce, larch and hemlock or the like.
    The soap oil used in the present invention is prepared according to an advantageous embodiment of the invention by acidifying tall oil soap with carbon dioxide. The tall oil soap used is obtained, for example, from black liquor during conifer boiling. According to an advantageous embodiment of the invention, the excess free carbon dioxide gas is removed by venting said soap oil mechanically and / or by vacuum treatment.
    The soap oil is ventilated in an intermediate tank after the carbon dioxide treatment and then preheated to remove the excess carbon dioxide. The residence time is typically 15-30 minutes and the temperature 75-95 ° C. The carbon dioxide content of the soap oil used is typically below 1% by weight (as free gas volume in the liquid), advantageously below 0.5% by weight, most advantageously below 0.2% by weight. The advantage of the ventilation and the low content of free carbon dioxide in the soap oil in accordance with the invention is that the formation of foam during boiling is reduced or eliminated. The foaming usually originates from the free carbon dioxide gas. In addition, the water content of the soap oil according to an embodiment of the invention is below 30% by weight, advantageously below 20% by weight or most advantageously below 10% by weight, either while the carbon dioxide content is below 1% by weight or deviating therefrom.
    In an advantageous embodiment of the invention, the preparation of pulp involves sulphate boiling and the cooking liquid consists of white liquor comprising sodium hydroxide and sodium sulphide as active main ingredients. According to a process for producing kraft pulp according to the present invention, the process comprises a dehumidifying step for removing extractives, wherein pulp or non-woody pulp is exposed to contact with a cooking liquor comprising soap oil and cooking liquid, for example white liquor.
    To obtain a desired level of extractives in the washed and bleached pulp, an active amount of soap oil is added in the preparation of the pulp. An amount of soap oil sufficient for sulphate boiling to remove extractives is according to an embodiment of the invention 10-40 kg, advantageously 15-35 kg, most advantageously 20-30 kg of soap oil per ton of air-dried pulp in the preparation of the pulp. For birch, the amount of extractives remaining in the pulp after bleaching is advantageously 0.15-0.3% by weight, advantageously <0.15%, most advantageously <0.1% per tonne of air-dry pulp.
    According to the preferred embodiment of the present invention, the curing phase is carried out during the boiling phase as a continuous flow or as one is advantageously added to both the boiling phase. The impregnation temperature is advantageously 100 ° C - 120 ° C and the boiling temperature is advantageously 140 ° C - 170 ° C and the pressure is advantageously 4 - 8 bar (e).
    The cooking is carried out advantageously for 2 - 4 hours, advantageously for 2.5 - 3.5 hours. batch cooking process. Thus the oil impregnation and pulp prepared according to the present invention can be used without further treatment or subjected to the washing, delignification and / or bleaching stages.
    The pulp can be delignified or bleached in a chlorine-free (TCF) or elemental chlorine-free (ECF) delignification or bleaching stage. Delignification or bleaching can be performed with ozone, peroxide, peracetic acid or similar chemicals. According to an advantageous embodiment, at least ozone is used as bleaching agent in the bleaching or in the bleaching sequence.
    The present invention also relates to a cooking liquor comprising white liquor and soap oil for use in the manufacture of pulp. Since the alkalinity of white liquor is high, the soap molecules deprotonate, leading to a better saponification. This is due to the fact that the soap oil reacts more actively in this way. The carbon dioxide content of the soap oil used is typically below 1% by weight (as free gas volume in the liquid), advantageously below 0.5% by weight, most advantageously below 0.2% by weight. At the same time as the carbon dioxide content is below 1% by weight or deviating from it, the water content in the soap oil is below 30% by weight, advantageously below 20% by weight, most advantageously below 10% by weight / o.
    Furthermore, according to an embodiment of the invention, a resinous pulp is prepared by removing extractives in the production of pulp by heating the cellulosic material in the presence of a cooking liquor comprising cooking liquid and soap oil. The carbon dioxide content of the soap oil is typically reduced in accordance with what has been stated above. According to an advantageous embodiment, a paper or board is produced from the resinous pulp described above.
    In the present invention, soap oil is used for resin control, that is, for removing extractives in the production of pulp. Advantageously, the soap oil is obtained by reacting tall oil soap with carbon dioxide and / or carbon dioxide.
    The process for producing resinous pulp typically comprises the steps of adding a cellulosic material to a digester, mixing soap oil with a cooking liquid, and performing heating of the cellulosic material in the presence of the mixture of soap oil and cooking liquid. According to an advantageous embodiment, the process further comprises one or a plurality of the steps for washing the cooked wood pulp (brown stock), carrying out one or a plurality of delignification and / or bleaching phases and for recovering the resinous pulp.
    According to an advantageous embodiment of the invention, a ventilated soap oil is formed by reacting tall oil soap with carbon dioxide, removing the excess carbon dioxide from the soap oil by ventilating the soap oil during intermediate storage and by intermediate heating of the soap oil.
    The cooking liquid used in an advantageous embodiment is white liquor. The cellulosic material used is advantageous wood pulp, most advantageously hardwood or a mixture of hardwoods. The active amount of soap oil or ventilated soap oil added is typically 10-40 kg, advantageously 15-35 kg, most advantageously 20-30 kg of soap oil per ton of air-dry pulp in the production of the pulp. According to an advantageous embodiment of the invention, ozone is used as bleaching agent during one or more bleaching steps. The following examples are intended to illustrate the invention in more detail and are not intended to limit the scope thereof. Based on the above description, one skilled in the art can modify the invention in many ways to provide an effective resin control process in pulping.
    Comparative Example 1 Resin pulp prepared with tall oil Birch wood chips (90 BDt / h) were fed into a continuous steam phase boiler with a pre-impregnation vessel. The wood chips were steamed for 10 min. at 1.5 bar and 120 ° C. Then the material was impregnated with impregnating liquid (white liquor 6% EA / BDt + black liquor with an L / W ratio of 4.5 for 30 minutes and 120 ° C), after which the impregnated material was boiled with an alkaline cooking liquor comprising white liquor (15% EA / BDt wood and black liquor with an L / W ratio of 4,5) and 25 kg of crude tall oil per tonne of air-dry pulp (Scandinavian quality, acid number 150 mg / kg) at a boiling temperature of 115 ° C / 145 ° C and 8 bar / 4 bar pressure in two steps. Cooking was continued for a total of 5 hours.
    The resulting boiled wood pulp was separated from the black liquor by filtration, and the cellulosic fibers, i.e. the brown stock, were washed with water during the simultaneous 6 phase washing stages to remove soluble extractants. The wood mass was filtered, after which the bleaching sequence used was O / O - A - ZD - Eop - D - Ep, in which O / O denotes oxygen treatment, A denotes acid treatment, ZD denotes ozone treatment enhanced with CIOZ, Eop denotes NaOH treatment enhanced with O 2 and NaZOZ, D denotes CIOZ treatment and Ep denotes NaOH treatment enhanced with NaZOZ.
    The amount of extractives in the pulp after bleaching was 0.20 - 0.35% by weight per ton of air-dry pulp. The amount of extractives was about 0.6% by weight when the bleaching was started.
    Example 2 Resin mass produced with soap oil Fig. 1 shows a schematic flow diagram of a process for producing resin mass. The process comprises treatment of soap oil 1 in an intermediate tank 2.
    Soap oil 1 was prepared by conventional acidification of tall oil soap with carbon dioxide. The ventilation of the soap oil was continued by preheating the soap oil for 30 minutes. at 85 ° C to remove excess carbon dioxide. 10 15 20 25 11 Birch wood chips (90 BDt / h) 3 were fed into a continuous steam phase boiler 4 with a pre-impregnation vessel. The wood chips were steamed for 10 minutes at 1.5 bar and 120 ° C.
    The material was then impregnated with impregnating liquid 5 (white liquor 5.5% EA / BDt + black liquor with an L / W ratio of 4.5) for 30 minutes. at 120 ° C, after which the impregnated material was boiled with alkaline cooking liquor 8 comprising white liquor 6 (15% EA / BDt wood + black liquor with an L / W ratio of 4.5) and 25 kg of ventilated soap oil 7 (the water content was about 20 ° / o) per tonne of air-dry pulp at a boiling temperature of 115 ° C / 145 ° C and 8/4 bar pressure in two steps. Cooking was continued for a total of 5 hours.
    The resulting boiled wood pulp was separated from the black liquor by filtration, and the cellulosic fibers, i.e. the brown stock, were washed with water during the simultaneous 6 phase washing stages 9 to remove soluble extractives. The wood mass was screened, after which the bleaching sequence 10 used was O / O - A - ZD - Eop - D - Ep.
    In this softened pulp 11, the amount of extractives in the pulp after bleaching was 0.2 - 0.35% by weight per ton of air-dry pulp. The amount of extractives was about 0.6% by weight when the bleaching was started.
    The preparation of birch pulp according to Examples 1 and 2 above is compared in Table 1.
    The amount of chemicals, extraction and energy needed for the production and soap oil are compared for the two processes for the use of tall oil and the production of 300,000 air-dry tonnes of birch pulp per year.
    Table 1 Tailoija in birch cooking soap oil in birch cooking Dosage tall oil / soap oil 25 25 kg / ADt birch production, ADt / year 300,000 300,000 C02, kg / h, crude tall oil 70 70 H2so4, kg / h crude tall oil 150 Dumping Na2SO4, t / year 1630 Energy in the recovery boiler, 6900 Gj (gigajoule) / year white liquor,% EA / BDt wood 21 20.5 ADt = air dried ton of pulp, air-dried ton of pulp BDt = bone dry ton, absolutely dry ton 10 15 12 The comparison shows that considerable benefits can be achieved when using soap oil instead of tall oil. This is due to chemical savings, ie the relatively large amounts of sulfuric acid required for the production of crude tall oil are not needed and in addition less white liquor is consumed due to the lower acidity of the soap oil. The pH of crude tall oil is usually around pH 4 or slightly lower, while the pH of the soap oil is typically around 8 and therefore less alkaline cooking liquid is needed.
    Neutralization of soap oil consumes only 0.03 kg of alkali (NaOH) per kg of soap oil when saponified to pH 12.5, while crude tall oil consumes 0.1 kg of alkali per kg of tall oil.
    In addition, the use of sulfuric acid leads to dumping costs for sodium sulphate, which increases sodium losses. In addition, the conversion of sulphate to sulphide in the extraction process is endothermic and consumes a lot of energy in the recovery boiler, which leads to energy losses. When using soap oil, removal of sodium sulfate can be avoided.
    The present invention has been described herein with reference to particular embodiments. However, it is obvious to a person skilled in the art that the process (s) can be varied within the scope of the claims.
    权利要求:
    Claims (1)
    [1]
    A process for removing the extractives in the production of pulp, characterized by the steps of a. Adding soap oil to a cooking liquid to form a cooking liquor, and b. Heating cellulosic material in the presence of said koklut. Process according to claim 1, characterized in that said soap oil is obtained by reacting tall oil soap with carbon dioxide. Method according to claim 1 or 2, characterized in that the excess carbon dioxide is removed from said soap oil by ventilating said soap oil mechanically and / or by vacuum treatment. Process according to any one of the preceding claims, characterized in that intermediate heating is used to remove the excess carbon dioxide from said soap oil. Process according to one of the preceding claims, characterized in that the carbon dioxide content of the soap oil is below 1% by weight, more advantageously below 0.5% by weight, most advantageously below 0.2% by weight. Process according to one of the preceding claims, characterized in that the water content of the soap oil is below 30% by weight, more advantageously below 20% by weight, most advantageously below 10% by weight. Process according to any one of the preceding claims, characterized in that said production of pulp consists of a sulphate process and said cooking liquid consists of white liquor. Method according to one of the preceding claims, characterized in that the cellulosic material is wood, advantageously hardwood or a mixture of hardwood. Method according to one of the preceding claims, characterized in that said wood mass consists of birch or a mixture of birch and other hardwood. Process according to any one of the preceding claims, characterized in that an active amount of soap oil is added in said preparation of maSSa. 10 15 20 25 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 14 Process according to one of the preceding claims, characterized in that 10-40 kg is added, advantageously 15-35 kg , most advantageously 20-30 kg of soap oil per ton of air-dry pulp in said pulp production. Process according to one of the preceding claims, characterized in that ozone is used for delignification and / or bleaching. Boiling cloth, comprising white liquor and soap oil for use in the production of pulp. Cooking cloth according to claim 13, characterized in that said soap oil is obtained by reacting tall oil soap with carbon dioxide. Boiling cloth according to one of Claims 13 or 14, characterized in that the carbon dioxide content of the soap oil is below 1% by weight, advantageously below 0.5% by weight, most advantageously below 0.2% by weight. Boiling cloth according to one of Claims 13 to 15, characterized in that the water content of the soap oil is below 30% by weight, advantageously below 20% by weight, most advantageously below 10% by weight. Resin pulp prepared by the process according to claim 1. Paper or board made from the resin pulp according to claim 17. Use of soap oil for removal of extractives in the production of pulp. The use according to claim 19, characterized in that the carbon dioxide content of the soap oil is below 1% by weight, advantageously below 0.5% by weight, most advantageously below 0.2% by weight. Process for producing resinous pulp, characterized by the steps of a. Adding a cellulosic material to a digester, b. Mixing soap oil with a cooking liquid, and c. Performing heating of said cellulosic material in the presence of said mixture of soap oil and cooking liquid. Process according to claim 21, characterized in that said process further comprises one or a plurality of steps for a. Washing the cooked wood pulp, b. Performing one or more bleaching steps, and c. recovering a resinous pulp. Process according to any one of claims 21 or 22, characterized in that said soap oil is produced by reacting tall oil soap with carbon dioxide. Process according to any one of claims 21-23, characterized in that the excess carbon dioxide is removed from said soap oil by venting said vacuum treatment and / or with such oil mechanically, with intermediate heating of said soap oil. Process according to any one of claims 21-24, characterized in that said cooking liquid consists of white liquor. Process according to any one of claims 21-25, characterized in that said cellulosic material consists of wood pulp, advantageous hardwood or a mixture of hardwood, most advantageously birch or a mixture of birch and other hardwood. Process according to any one of claims 21-26, characterized in that an active amount of soap oil is added in said pulp production. Process according to any one of claims 21-27, characterized in that 10-40 kg, advantageously 15-35 kg, most advantageously 20-30 kg of soap oil per ton of air-dry pulp are added during said production of pulp. Process according to one of Claims 21 to 28, characterized in that ozone is used for delignification and / or bleaching.
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    同族专利:
    公开号 | 公开日
    RU2500688C2|2013-12-10|
    RU2010112495A|2011-10-10|
    FI20095367A0|2009-04-03|
    FI123012B|2012-09-28|
    SE534973C2|2012-03-06|
    FI20095367A|2010-10-04|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US7081183B2|2002-07-23|2006-07-25|Nalco Company|Method of deresinating pulp using alkyl alcohol alkoxylate surfactants|
    FI121382B|2002-12-23|2010-10-29|Arizona Chemical B V|Additives for boiling wood pulp, as well as the manufacture and use thereof|
    US7504478B2|2007-01-26|2009-03-17|Nalco Company|Additives for increasing the separation yield of tall oil soap from black liquors|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FI20095367A|FI123012B|2009-04-03|2009-04-03|Process for controlling extractive substances in pulp production, pulp so produced and its use|
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