• 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:
    method for inhibiting the formation and deposition of silica encrustation in aqueous systems this invention relates to an improved method for inhibiting the formation and deposition of silicate and silica compounds in an aqueous system; in particular, the method includes the addition of a relatively low molecular weight anionic and organic polymer; the polymer preferably has a methacrylic acid or acrylic acid functionality and is preferably selected from one or more acrylic acid homopolymers, a methacrylic acid ether / polyethylene glycol allyl copolymer, a methacrylic acid homopolymer, a copolymer of polyethylene glycol ether / methacrylic acid ether, a copolymer of polyethylene glycol ether / acrylic acid, and a copolymer of sulfonic acid 1-allyloxy-2-hydroxypropane / acrylic acid, maleic anhydride homopolymers, maleic anhydride copolymers and ether ether. polyethylene glycol ally, and combinations thereof.
    公开号:BR112013016102B1
    申请号:R112013016102-7
    申请日:2011-12-21
    公开日:2020-02-11
    发明作者:Nathaniel T. Greene；Jasbir S. Gill；Martin R. Godfrey；Cheryl Williams
    申请人:Nalco Company；
    IPC主号:
    专利说明:

    METHOD FOR INHIBITING THE FORMATION AND DEPOSITION OF SILICA AND SILICATE COMPOUNDS IN AQUEOUS SYSTEMS.
    TECHNICAL FIELD [0001] The present invention relates, in general, to silica scale inhibitors. More specifically, the present invention relates to a method of inhibiting the formation and deposition of silicate and silica compounds in water systems with low molecular weight anionic polymers. BACKGROUND OF THE INVENTION [0002] In many parts of the world, amorphous silica inlays cause significant contamination problems when industrial waters contain high amounts of silica. In the vast majority, high amounts of silica mean that industrial waters contain at least 5 ppm and up to about 500 ppm of dissolved silica and may contain higher amounts of silica in dissolved, dispersed or colloidal forms.
    [0003] Silica solubility adversely limits the efficient use of water in industrial applications, such as cooling, boiler, geothermal, reverse osmosis and papermaking. Specifically, water treatment operations are limited, as the solubility of silica by about 150 ppm can be exceeded when minerals are concentrated during processing. This excess can result in the precipitation and deposition of silica and amorphous silicates with consequent loss of equipment efficiency. In addition, the accumulation of silica on the internal surfaces of water treatment equipment, such as boilers, cooling and purification systems, reduces heat transfer and fluid flow through the exchange tubes and membranes.
    Petition 870190076424, of 08/08/2019, p. 13/49
    2/17 heat.
    [0004] Since the silica scale is formed in the treatment equipment, its removal is very expensive and difficult. With water with a high amount of silica, therefore, cooling and reverse osmosis systems generally operate with low water use efficiency to ensure that the solubility of the silica is not exceeded. Under these conditions, however, reverse osmosis systems must limit their rate of recovery of pure water and cooling systems must limit water recycling. In both cases, the water discharge volumes are very large.
    [0005] Over the years, several additives have been used to inhibit the deposition of silica. Current technologies for controlling silica scale in industrial cooling systems involve the use of colloidal silica dispersants or silica polymerization inhibitors. Dispersant technologies have shown little activity, being able to stabilize only small increases in the total silica in a tower. For example, with the use of a dispersant, silica levels can increase from 130-200 to 180-220 ppm, which is usually an undetectable increase in silica cycles.
    [0006] On the other hand, silica polymerization inhibitors have been shown to be more effective against silica scale deposition. For example, U.S. Patent No. 4,532,047 to Dubin relates to the use of a low molecular weight, water-soluble, polypolar organic compound to inhibit the formation of amorphous silica scale on the surface in contact with industrial waters. Similarly,
    Petition 870190076424, of 08/08/2019, p. 14/49
    3/17 U.S. Patent No. 5,658,465 to Nicholas et al. refers to the use of polyoxazoline with a silica scale inhibiting technology. These polymerization inhibitors enabled increases in soluble silica of more than 300 ppm without the formation of scale.
    [0007] There is, therefore, an industrial need for fouling control agents that increase performance compared to those currently known in the art.
    SUMMARY OF THE INVENTION [0008] Consequently, the present disclosure presents a method for inhibiting the formation and deposition of silica and silicate compounds in a water system. The inventors have found that certain low molecular weight polymers are effective inhibitors of the polymerization of soluble silica and scale deposition in water systems. In one embodiment of the invention, the method includes adding an effective amount of inhibition of one or more anionic polymers of relatively low molecular weight to water in the water system. The polymer is preferably selected from a group consisting of acrylic acid homopolymers, methacrylic acid copolymer and polyethylene glycol ether, methacrylic acid homopolymers, acrylic acid copolymers and polyethylene glycol allyl ether and copolymers of acrylic acid and 1-allyl-2 hydroxy propane sulfonic acid, maleic anhydride homopolymers, maleic anhydride copolymers and polyethylene glycol allyl ether, and combinations thereof. Said polymers are disclosed, for example, in JP2138319 (A), Allyl Ether-Maleic Anhydride Copolymer, by Yasukochi Toru et al.
    Petition 870190076424, of 08/08/2019, p. 15/49
    4/17 [0009] It is an advantage of the invention to provide> 50% increase in the dispersion of polymeric and monomeric silicas of the present technique.
    [0010] Another advantage gives invention is that The chemistry disclosed works from way to reduce The self-curing of silica, keeping an part of silica in
    monomeric form.
    [0011] Another advantage of the invention is that it allows for easier and smoother removal of the existing silica scale.
    [0012] Another advantage of the invention is that the chemistry is thermally stable at a temperature above 300 ° C for more than 5 hours.
    [0013] Another advantage of the invention is that it can be connected to tracking features, making it compatible with fluorescent tracking technologies, such as TRASAE.® technology (made available by the Naico® Company, Naperville, Illinois, USA).
    [0014] The foregoing has generally described the characteristics and technical advantages of the present invention, so that the detailed description of the following invention can be better understood. Additional features and advantages of the invention will be described below, which form the subject of the claims of the invention. It should be noted by those skilled in the art that the specific design and configurations disclosed can readily be used as a basis for modifying or designing other configurations for the same purposes as the present invention. It should also be noted by those skilled in the art that the equivalent configurations do not deviate from the spirit and scope of the invention, as
    Petition 870190076424, of 08/08/2019, p. 16/49
    5/17 defined in the appended claims.
    DETAILED DESCRIPTION OF THE INVENTION [0015] Polymers for use in the disclosed invention are polymers of relatively low molecular weight and preferably have an average molecular weight ranging from about 5,000 to 200,000 as described in more detail below. The organic polymers of the present invention are preferably those polymers or copolymers that have the functionality of methacrylic acid or acrylic acid. Exemplary polymers include: homopolymers of acrylic acid containing an average molecular weight of about 5,000 to about 200,000; copolymers of methacrylic acid and polyethylene glycol ether ether containing average molecular weights of about 5,000 to about 7,000; homopolymers of methacrylic acid containing an average molecular weight of about 15,000; copolymers of acrylic acid and polyethylene glycol allyl ether containing an average molecular weight of about 5,000 to about 7,000; copolymers of acrylic acid and 1allyloxy-2-hydroxypropane sulfonic acid containing an average molecular weight of about 32,000, and combinations thereof.
    [0016] In one embodiment, the polymers of the invention are water-soluble homopolymers and copolymers that use carboxylated and alkoxylated monomers. Representative alkoxy groups include propoxy (propylene oxide), ethoxy (ethylene oxide) and hydroxyl substituted alkyl chains, and combinations thereof. In one embodiment, the polymers of the invention are water-soluble homopolymers and copolymers that use carboxylated and alkoxylated monomers. More specifically, the alkoxylated monomer can be derived from ethylene oxide, propylene oxide, or any of its
    Petition 870190076424, of 08/08/2019, p. 17/49
    6/17 combinations. The average substitution varies from about 4 to 20 mol percent.
    [0017] The average molecular weight (MW) of the polymers preferably ranges from about 5,000 Da to about 200,000 Da, with the polymer assets generally between about 25% - 100%. The dosage ranges for the invention are about 1-100 ppm.
    Representative polymers of the invention include water-soluble copolymers of acrylic acid, methacrylic acid or maleic anhydride and an ethoxylated monomer, where the monomer head is an acrylate, methacrylate or allyl part and ethoxylate appendix generally between 5-15 units. The monomer units in these copolymers can be provided from 90:10 to 10:90, respectively. Preferably, the proportion of the monomer units is between 40:60 and 60:40, respectively. Polymer assets generally exist in an upward direction of 100%, but due to viscosity limitations for certain applications (for example, pumping capacity for transport or dosing), most active levels of exemplary polymers have been positioned between 35% and 50% . The typical PM varies between about 10,000 Da and about 100,000 Da, based on manufacturing conditions and supplier quality, but the ideal PM is between about 20,000 Da and about 35,000.
    [0019] In one configuration, the polymer is a 2-propenoic acid, polymer with a-2-propen-1-yl-m-hydroxypoly (oxy-1,2-ethanedyl), sodium acetate, peroxydisulfuric acid ([ HO) S (O) 2] 2O2), sodium acetate (1: 2) initiated (CAS No. 137898-98-7).
    [0020] In one configuration, the polymer is a
    Petition 870190076424, of 08/08/2019, p. 18/49
    7/17 2-Propenoic acid, polymer with α-2propen-1-yl-m-hydroxypoly (oxy-1,2-ethanedyl) block copolymer (CAS No. 101081879-7).
    [0021] In one embodiment, the polymer is a 2-propenoic acid, polymer with a graft copolymer α-2propen-1-yl-m-hydroxypoly (oxy-1,2-ethanedyl) (CAS No. 18550687-0) .
    [0022] In the configurations, the polymer of the invention exists in several salt forms containing a counterion, such as sodium, potassium and ammonia.
    [0023] This invention presents methods for inhibiting the formation and deposition of silica and silicate compounds in water systems. The methods include adding an effective amount of inhibition of an amount of polymers to water in a water system, in accordance with the present invention.
    [0024] The precise effective dosages in which the polymers can be used will vary depending on the characterization of the water being treated. For example, an effective dosage (based on the total polymer) for cooling water treatment will generally be in the range of about 0.5 to about 500 ppm. In alternative configurations, dosage ranges from about 1 to about 100 ppm, or from about 5 to about 60 ppm can be used. In configurations, dosages between about 5 ppm and 50 ppm can also be used. Typical dosages for industrial system water treatment can range from about 10,000 to about 100,000 ppm. In the configurations, the polymers can be added directly to the water system, being treated as an aqueous solution intermittently or
    Petition 870190076424, of 08/08/2019, p. 19/49
    8/17 continuous.
    [0025] Industrial waters that require special treatment with the polymers of this invention are generally waters that contain silica in dissolved, suspended or colloidal form. Silica is present as silicic, dissolved species, silicates or as its complex ions and can also be present as colloidal or suspended silica. The total silica concentration in industrial waters is generally low. When it exceeds about 120-150 ppm in total concentration, the formation of amorphous silica scale becomes a problem. However, in the presence of common cations, such as Ca, Mg, Zn, Al, Se, etc., present in the water, much lower levels of silica can cause scale / deposition problems. Obviously, the higher the total silica concentration of all sources in these waters, the more difficult the problem created by the formation of amorphous silica scale.
    [0026] Industrial waters may be cooling waters, geothermal waters, salt water for desalination purposes, industrial waters being prepared for boiler treatment and steam generation, well waters for the recovery of crude oil, pulp waters and power plants. paper, mineral and mining processing waters, and the like. The problem of formation of amorphous silica scale on surfaces in contact with these industrial waters is particularly observed when the industrial waters are alkaline, containing a pH of at least 5.0 or higher, and containing at least 5 ppm of total silica like SiO2. The effective use of the polymers of the present invention occurs, preferably, with pHs of at least 5.0 or higher and with
    Petition 870190076424, of 08/08/2019, p. 20/49
    9/17 temperatures that can range from room temperatures to temperatures above 500 ° F. However, as can be seen by a person skilled in the art, the polymers of the present invention must also be effective in waters containing a pH less than 5.0.
    [0027] It is of particular importance to treat alkaline industrial water being used as cooling water, either on a direct basis or, particularly, in a recirculating cooling water system. When these alkaline cooling waters contain a sufficient amount of silica, the problem of the formation of amorphous silica scale on surfaces in contact with the cooling waters is exaggerated. As alkalinity increases, the problem of amorphous silica scale formation also increases. Therefore, the effectiveness of the polymers used in the present invention must also be demonstrated at a pH in excess of about 8.0.
    [0028] Although it is not necessary to implement the present invention, it is contemplated that the scale inhibiting polymers of the invention can be combined with one or more corrosion inhibitors, one or more other scale inhibitors, one or more fluorescent detectors, one or more more water treatment polymers, one or more polyalkoxy compounds, or any other suitable additional adjunct or component. Any such adjuncts can be part of an existing program for which the invention becomes an additional component or program. In alternative configurations, said adjuncts can be added simultaneously or sequentially with the polymers of the invention.
    [0029] It should be noted that the method, in
    Petition 870190076424, of 08/08/2019, p. 21/49
    10/17 certain configurations, can be combined with other utilities known in the industry. Representative utilities include sensors for measuring the content of various additives in the system; sensors for dissolved or particulate contaminants; other sensors based on resistance, capacitance, absorbance or spectroscopic transmission, colorimetric measurements and fluorescence; and mathematical tools for analyzing sensor / controller results (eg, multivariate analysis, chemometrics, dosing control on / off, dosing control PID, similar, and combinations thereof).
    [0030] In another configuration, an inert fluorescent detector is included in the synergistic mixture to provide a means of determining the dosage level. A known proportion of the fluorescent detector is added simultaneously or sequentially with the mixture. Effective inert fluorescent detectors include those substances that are chemically non-reactive with other components in the system and that are not significantly degraded over time. Said detectors must also be completely (or essentially completely) soluble in the mixture at all relevant levels of concentration and, preferably, the fluorescence intensity should be substantially proportional to its concentration and not significantly dimmed or, in any other way, decreased other components in the system. In addition, the inert fluorescent detector must not be significantly affected by any other chemicals in the system. The statement not significantly affected means that an inert fluorescent compound generally does not have a greater than 10% change in its fluorescent signal,
    Petition 870190076424, of 08/08/2019, p. 22/49
    11/17 under conditions normally found in ethanol fuel.
    [0031] The desired characteristics for an inert fluorescent detector preferably include: wavelengths of excitation / fluorescence emission that do not have a significant overlap with light-absorbing substances present in the system water, other additives, contaminants, etc .; high solubility; excellent chemical stability; suitable fluorescence properties at manageable wavelengths (for example, other components in the system should not interfere with the fluorescence properties at said wavelengths) and excitation / emission wavelengths that are separate from other fluorescent components that may be present in the system to avoid interference; and avoid negative impacts on system properties.
    Representative inert fluorescent detectors include fluorescein or its derivatives; rhodamine or its derivatives; naphthalene sulfonic acids (mono-, di-, tri-, etc.); pyrene sulfonic acids (mono-, di-, tri-, tetra-, etc.); stylbene derivatives containing sulfonic acids (including optical brighteners); biphenyl sulfonic acids; phenylalanine; tryptophan; tyrosine; vitamin B2 (riboflavin); vitamin B6 (pyridoxine); vitamin E (αtocopherols); ethoxyquin; caffeine; vanillin; condensation polymers of naphthalene sulfonic acid formaldehyde; condensates of phenyl sulfonic acid formaldehyde; sulfonic lignin acids; polycyclic aromatic hydrocarbons; aromatic (poly) cyclic hydrocarbons containing amine, phenol, sulfonic acid, carboxylic acid functionalities in any combination; Hydrocarbons
    Petition 870190076424, of 08/08/2019, p. 23/49
    12/17 aromatic (poly) heterocyclics containing N, O, or S; a polymer containing at least one of the following parts: naphthalene sulfonic acids; pyrene sulfonic acids, biphenyl sulfonic acids or stylonic sulfonic acids. Additional examples of said inert fluorescent detectors can be found in U.S. Patent Nos. 6,966,213 B2, entitled Rapid Method for Detecting Leaks of Hydraulic Fluids in Production .Plants and 7,169,236 B2, entitled Method of Monitoring Membrane Cleaning Process. These inert fluorescent detectors are commercially available, for example, under the trademark TRASAR, from the Naleo Company, or can be synthesized using techniques known to people of ordinary skill in the organic chemistry technique.
    [0033] Finally, the polymers of the present invention can be combined with other water treatment agents. For example, polymers can be used with water treatments, such as those used to inhibit corrosion and those treatments used to disperse or prevent scale formation of other types.
    [0034] Representative scale inhibitors include, but are not limited to, organic and inorganic polyphosphates, phosphonates and polycarboxylates. These inhibitors help to inhibit or disperse other scale, such as calcium carbonate, calcium sulfate, calcium phosphate, calcium fluoride, barium sulfate, calcium oxalate, and the like. Inhibition of scale helps the polymer reach its full potential to inhibit silica / silicate deposit.
    [0035] Inorganic polyphosphates include
    Petition 870190076424, of 08/08/2019, p. 24/49
    13/17 compounds formed by phosphate units linked by phosphoanhydride bonds, as shown in the following formula:
    Í9
    L C -n, where n
    2-20 [0036] Organic polyphosphates (organic polymeric phosphate) include polyphosphate ester, as shown in the following formula:
    where R is a substituted or unsubstituted alkyl or aryl and n = 2-20. Representative organic and inorganic polyphosphates include sodium tripolyphosphate, sodium hexametaphosphates, anionic silicone phosphate ester, alkyl phosphate ester, and the like.
    [0037] Phosphonates include compounds containing the structural part
    O
    GP- (OR) 2 where R is H or alkyl, or aryl, substituted or unsubstituted. Representative phosphonates include commercially available products including HEDP (1-hydroxy ethylidene 1,1diphosphonic acid and its salts), AMP (amino tri (methylene phosphonic acid) and its salts), PAPEMP (polyamino polyethylene phosphonic acid and its salts), and the like .
    [0038] Polycarboxylates comprise polymers composed of monomers containing a functional group of carboxylic acid or its salts, including, for example, acid
    Petition 870190076424, of 08/08/2019, p. 25/49
    14/17 acrylic, methacrylic acid, α-haloacrylic acid, maleic acid or anhydride, vinylacetic acid, arylacetic acid, fumaric acid, and β-carboxyethylacrylate and the like. Representative polycarboxylates include commercially available, low molecular weight, water-soluble polyacrylic acid, polymalleic acid, acrylic acid - AMP copolymers, and the like.
    [0039] Polyphosphates, phosphonates and polycarboxylates and their uses for scaling inhibition are known in the art. See, for example, U.S. Patents 4,874,527, 4,933,090 and 5,078,879.
    [0040] The foregoing can be better understood by reference to the following examples, which are presented for purposes of illustration and are not intended to limit the scope of the invention.
    Example 1: Stagnant Flask Study [0041] This test was conducted using a 300 ppm test solution formed by sodium silicate as SiO 2 , 80 ppm as magnesium sulfate Mg, 100 ppm as total alkalinity of sodium bicarbonate and 200 ppm as calcium chloride calcium. The pH of the test solution was adjusted between 8.5-9.0. These test solutions were dosed with varying amounts of silica inhibitors and a constant amount (2 ppm) of 2-phosphonobutane-1,2,4-tricarboxylic acid (generally called PBTC) as a calcium carbonate inhibitor. These samples were measured with a thermostat at 60 ° C. The samples were taken at different times and filtered through a 2.5 micron filter before the silica was analyzed, with a pH of 7-7.5. Sample 1 was 50/50 acrylic acid (AA) / polyethoxy methacrylate (HEMA) 40% active. Sample 2 was 40/60 AA / 40% active hydroxypolyethoxy ally AAE ether. THE
    Petition 870190076424, of 08/08/2019, p. 26/49
    15/17 sample 3 was 50/50 AA / AAE 40% active. Sample 4 was 60/40
    AA / AAE 40% active.
    Soluble Silica (ppm)
    Time White Sample 1 Sample 2 Sample 3 Sample 4 1 = 0 hrs 320 266 305 312 313 T = 24 Hrs 171 217 266 256 289
    Example 2: Pilot Cooling Tower Study [0042] The following water was used in this study: Calcium (Ca) 12 mg / L; Magnesium (Mg) 4.0 mg / L; Potassium (K) 2.5 mg / L 2.6 mg / L; Silica (S10c) 89 mg / L; Sodium (Na) 13 mg / L; Chloride (Cl) 4.3 mg / L; Nitrate (NO3) 1.6 mg / L; Sulfate (SO4) 2.4 mg / L; Chloride (CaCO3) 6.1 mg / L; Total Alkalinity (CaCO3) 71 mg / L; Conductivity at 25 ° C 150 pS / cm; and pH at 25 ° C 8.3 pH units.
    [0043] The water was dosed with 20 ppm of the silica inhibitor of the invention and 20 ppm of the calcium carbonate inhibitor (PBTC). The water was recirculated in several cycles of the heat exchanger and rejected by heat by means of a cooling tower. In this process, the water was concentrated between 3-3.5 times (concentration factor) of the original water chemistry. The pH recirculation cycle was recorded at -8.9. The delta temperature between the inlet and outlet of the heat exchanger was 10 ° F. The water chemistry was monitored in the recirculation cycle and the heat exchangers were monitored for any contamination.
    [0044] The results found that no observable deposition was found in the heat exchangers and there was a 97% recovery for all ions in the concentration cycle as a result of the silica inhibitor.
    [0045] All compositions and methods disclosed and claimed herein can be made and
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    16/17 executed without undue experimentation in the light of this disclosure. While this invention can be configured in many different ways, the preferred embodiments of the invention are described in detail. The present disclosure is an example of the principles of the invention and is not intended to limit the invention to the particular configurations illustrated. In addition, unless expressly stated otherwise, the use of the term one (a) includes at least one or one or more. For example, a device includes at least one device or one or more devices.
    [0046] Any ranges presented in absolute or approximate terms are intended to encompass both numbers, and any definitions used herein are intended to be enlightening and not limiting. Although the numerical ranges and parameters that define the broad scope of the invention are approximations, the numerical values defined in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contains certain errors that necessarily result from the standard deviation found in the respective test measurements. In addition, all ranges disclosed herein comprise any and all sub-ranges (including fractional and internal values) sub-summed up in the present.
    [0047] In addition, the invention encompasses any and all possible combinations of some or all of the various configurations described herein. Any and all patents, patent applications, scientific studies and other references cited in this application, as well as any references cited, are incorporated herein in full by reference. It should also be understood that several changes
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    17/17 and modifications to the preferred configurations described herein will be apparent to those skilled in the art. Said changes and modifications can be made without departing from the spirit and scope of the invention and without diminishing its intended advantages. It is therefore intended that the said changes and modifications are covered by the attached claims.
    权利要求:
    Claims (5)
    [1]
    1. METHOD FOR INHIBITING THE FORMATION AND DEPOSITION OF SILICA AND SILICATE COMPOUNDS IN AQUEOUS SYSTEMS, the method having the addition to water in the aqueous system of 1 to 100ppm of one or more anionic polymer (s) with low molecular weight characterized by one or more low molecular weight anionic polymer (s) to be (s) copolymer (s) of methacrylic acid and polyethylene glycol ether, having an average molecular weight of 5,000 to 7,000 Da with the active polymers between 25 % and 100%, where the water in the aqueous system contains dissolved silica and where the ratio of the monomer units is between 40:60 and 60:40.
    [2]
    2. METHOD FOR INHIBITING THE FORMATION AND DEPOSITION OF SILICA AND SILICATE COMPOUNDS IN AQUEOUS SYSTEMS, according to claim number 1, characterized in that the aqueous system is selected from water cooling systems, geothermal water systems, water desalination systems salt water, water boiler systems, well water systems for crude oil recovery, pulp water systems and the paper industry and water systems for mining and mineral processing.
    [3]
    3. METHOD FOR INHIBITING THE FORMATION AND DEPOSITION OF SILICA AND SILICATE COMPOUNDS IN AQUEOUS SYSTEMS, according to claim number 1, characterized in that the aqueous system is a water cooling system.
    [4]
    4. METHOD FOR INHIBITING THE FORMATION AND DEPOSITION OF SILICA AND SILICATE COMPOUNDS IN AQUEOUS SYSTEMS, according to claim number 1, characterized by the addition of one or more corrosion inhibitor (s), inhibitor (s) fouling or dispersant (s) to the system
    Petition 870190076424, of 08/08/2019, p. 30/49
    2/2 aqueous.
    [5]
    5. “METHOD FOR INHIBITING THE FORMATION AND DEPOSITION OF SILICA AND SILICATE COMPOUNDS IN AQUEOUS SYSTEMS, according to claim number 4, characterized in that dispersants or scale inhibitors are selected from the group consisting of: polyphosphates, phosphonates, organic polycarboxylates and inorganic compounds and combinations thereof.
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    同族专利:
    公开号 | 公开日
    ES2733739T3|2019-12-02|
    NZ612313A|2015-05-29|
    AU2011349183A1|2013-07-11|
    ZA201304655B|2014-03-26|
    AU2011349183B2|2016-07-07|
    CA2822608A1|2012-06-28|
    JP2014503352A|2014-02-13|
    EP2655270B1|2019-04-24|
    CN103380089B|2016-10-26|
    MX344645B|2017-01-04|
    SG191311A1|2013-07-31|
    EP2655270A2|2013-10-30|
    EP2655270A4|2014-07-30|
    BR112013016102A2|2016-09-20|
    KR20130114186A|2013-10-16|
    WO2012088240A2|2012-06-28|
    CA2822608C|2020-06-09|
    JP5686905B2|2015-03-18|
    MX2013007305A|2013-07-29|
    US20120161068A1|2012-06-28|
    CN103380089A|2013-10-30|
    US9221700B2|2015-12-29|
    WO2012088240A3|2012-10-26|
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    法律状态:
    2018-04-03| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|
    2019-06-11| B06T| Formal requirements before examination|
    2019-12-24| B09A| Decision: intention to grant|
    2020-02-11| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 21/12/2011, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US12/976,013|2010-12-22|
    US12/976,013|US9221700B2|2010-12-22|2010-12-22|Method for inhibiting the formation and deposition of silica scale in aqueous systems|
    PCT/US2011/066427|WO2012088240A2|2010-12-22|2011-12-21|Method for inhibiting the formation and deposition of silica scale in aqueous systems|
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