CN111139111A - Comb type coal water slurry additive and preparation method thereof - Google Patents
Comb type coal water slurry additive and preparation method thereof Download PDFInfo
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- CN111139111A CN111139111A CN201911340615.8A CN201911340615A CN111139111A CN 111139111 A CN111139111 A CN 111139111A CN 201911340615 A CN201911340615 A CN 201911340615A CN 111139111 A CN111139111 A CN 111139111A
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/32—Liquid carbonaceous fuels consisting of coal-oil suspensions or aqueous emulsions or oil emulsions
- C10L1/326—Coal-water suspensions
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- C10L1/10—Liquid carbonaceous fuels containing additives
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L10/00—Use of additives to fuels or fires for particular purposes
- C10L10/18—Use of additives to fuels or fires for particular purposes use of detergents or dispersants for purposes not provided for in groups C10L10/02 - C10L10/16
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/10—Liquid carbonaceous fuels containing additives
- C10L1/12—Inorganic compounds
- C10L1/1275—Inorganic compounds sulfur, tellurium, selenium containing compounds
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/10—Liquid carbonaceous fuels containing additives
- C10L1/12—Inorganic compounds
- C10L1/1283—Inorganic compounds phosphorus, arsenicum, antimonium containing compounds
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/10—Liquid carbonaceous fuels containing additives
- C10L1/14—Organic compounds
- C10L1/18—Organic compounds containing oxygen
- C10L1/188—Carboxylic acids; metal salts thereof
- C10L1/1881—Carboxylic acids; metal salts thereof carboxylic group attached to an aliphatic carbon atom
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/10—Liquid carbonaceous fuels containing additives
- C10L1/14—Organic compounds
- C10L1/18—Organic compounds containing oxygen
- C10L1/19—Esters ester radical containing compounds; ester ethers; carbonic acid esters
- C10L1/1905—Esters ester radical containing compounds; ester ethers; carbonic acid esters of di- or polycarboxylic acids
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/10—Liquid carbonaceous fuels containing additives
- C10L1/14—Organic compounds
- C10L1/24—Organic compounds containing sulfur, selenium and/or tellurium
- C10L1/2406—Organic compounds containing sulfur, selenium and/or tellurium mercaptans; hydrocarbon sulfides
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/10—Liquid carbonaceous fuels containing additives
- C10L1/14—Organic compounds
- C10L1/24—Organic compounds containing sulfur, selenium and/or tellurium
- C10L1/2431—Organic compounds containing sulfur, selenium and/or tellurium sulfur bond to oxygen, e.g. sulfones, sulfoxides
- C10L1/2437—Sulfonic acids; Derivatives thereof, e.g. sulfonamides, sulfosuccinic acid esters
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Abstract
The invention provides a comb type coal water slurry additive and a preparation method thereof, relating to the technical field of coal water slurry additives, wherein the raw materials of the coal water slurry additive comprise, by weight, 320 parts of sorbitol maleate monomer 210, 1-40 parts of 2-acrylamide-2-methylpropanesulfonic acid, 3-5 parts of α -methylstyrene sulfonic acid, 30-150 parts of acrylic acid, 1-5 parts of initiator and 1-8 parts of molecular weight regulator.
Description
Technical Field
The invention relates to the technical field of coal water slurry additives, in particular to a comb-type coal water slurry additive and a preparation method thereof.
Background
Energy has been a cornerstone of world progress and development, with coal, oil and gas being several conventional forms of energy. In the total energy consumption of China, 22.5 percent of petroleum, 72.9 percent of coal and 4.6 percent of other energy. China is a country with more coal and less oil, oil resources are relatively poor, coal resources are abundant, and in decades in the future, coal can continuously play a role of main energy in China, but the direct combustion utilization of coal causes lower utilization efficiency and serious climate deterioration and environmental pollution.
The comprehensive consideration of energy safety and environmental problems, and the clean utilization of coal resources are increasingly paid attention. The clean coal technology has been proposed for 30-40 years, and the following three improvements are mainly provided for further improving the utilization rate of coal, meeting the environmental protection standard and improving the economic utilization value of coal: the discharge amount of greenhouse gas carbon dioxide is reduced by improving the recycling of carbon; combustion technology is improved so as to improve the effective utilization rate of coal; and the emission of environmental pollutants such as sulfur dioxide, nitrogen oxides, solid particles and the like is controlled. In the current world facing the oil crisis, new energy substitutes are researched, and coal water slurry is one of the substitutes.
In recent years, many researches are made on coal water slurry additives at home and abroad, and a series of competitive products are produced. The research and application of the coal water slurry dispersing agent are prominent in foreign Nippon oil ester company, Kao corporation, and the Across corporation. A series of good dispersants such as sodium polystyrene sulfonate (PSS), naphthalene sulfonate polymer (NSF), etc. have been developed by japanese researchers and have been used in industrial production. The national brewing company of America synthesizes a nonionic dispersant as the water-coal-slurry dispersant, which can lead the concentration of the prepared water-coal-slurry to reach 70 percent and has ideal stability and fluidity. The coal water slurry NDF dispersant developed by Nanjing university at home is suitable for wide coal types and has good performance. The water coal slurry additive synthesized by Kunzhan fine chemical company of Kunzhan city, Jiangsu province has certain performance even exceeding that of similar Japanese products. HNF developed by Huainan mining group synthetic material Limited liability company can simultaneously give consideration to the dispersibility and stability of the coal water slurry.
The total amount of coal resources in China is rich, the resource reserves of coal in China are 15663.1 hundred million tons, and the low-rank coal accounts for more than 50 percent. In the existing pulping technology, low-rank coal is difficult to prepare high-concentration coal water slurry. And the dispersant used for the coal water slurry mainly comprises a naphthalenesulfonic acid formaldehyde condensate, a lignin system, a humic acid system, a sulfonated acetone formaldehyde condensate, a nonionic dispersant and the like. However, most of these dispersants are produced from petroleum products, which are expensive and easily cause environmental pollution. And the pulp concentration of the coal is not high, and the pulp concentration of the coal is between 59 and 61 by using low-rank coal and immature coal generally.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a comb-type coal water slurry additive and a preparation method thereof. The dispersant has the advantages of easily available raw materials, environmental protection, low price, good dispersibility and the like, and the slurry concentration in low-rank coal samples in certain areas reaches 63-67 percent, which is 2-3 percent higher than that in the market.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme:
the comb type coal water slurry additive comprises, by weight, 320 parts of sorbitol maleate monomer 210, 1-40 parts of 2-acrylamide-2-methylpropanesulfonic acid, 3-5 parts of α -methylstyrene sulfonic acid, 30-150 parts of acrylic acid, 1-5 parts of an initiator and 1-8 parts of a molecular weight regulator.
Further, the initiator is one or two of ammonium persulfate and potassium persulfate which are mixed in any proportion.
Further, the molecular weight regulator is one or two of sodium hypophosphite, potassium hypophosphite, sodium bisulfite, thioglycolic acid, mercaptopropionic acid and mercaptoethanol which are mixed in any proportion.
Further, the preparation method of the maleic acid sorbitol ester monomer comprises the following steps: adding maleic anhydride and sorbitol into a reaction kettle, adding a catalyst, vacuumizing, stirring by using a magnetic stirrer, slowly heating to 80-95 ℃, reacting at a constant temperature for 2-6h, detecting the esterification degree every 30min, cooling after the esterification degree meets the requirement, and finishing the reaction to obtain the sorbitol maleate monomer.
Further, the mass ratio of the maleic anhydride to the sorbitol is 1-3: 1.
further, the catalyst is one or more of sulfuric acid, phosphoric acid and p-toluenesulfonic acid, and the amount of the catalyst is 2-3.0% of the mass of maleic anhydride.
The preparation method of the comb-type coal water slurry additive comprises the following steps of adding a sorbitol maleate monomer, 2-acrylamide-2-methylpropanesulfonic acid and α -methylstyrene sulfonic acid into a reaction kettle at 65-85 ℃ to prepare an aqueous solution with a certain concentration, dissolving and stirring uniformly, dropwise adding an aqueous solution of acrylic acid, an initiator and a molecular weight regulator into the reaction kettle to perform free radical copolymerization, preserving heat after the reaction is finished, and finally adjusting the pH value with an aqueous solution of sodium hydroxide to obtain the coal water slurry additive.
(III) advantageous effects
The invention provides a comb type coal water slurry additive and a preparation method thereof, and the comb type coal water slurry additive has the following beneficial effects:
1. the reaction condition of the coal water slurry additive is room temperature free radical polymerization, the reaction condition is easy to control, the production process is simple, and no three wastes are discharged.
2. The coal water slurry additive has better dispersibility under lower mixing amount.
3. The coal water slurry additive can obviously improve the concentration of coal water slurry.
4. The coal water slurry additive can prolong the slurry stabilization time and has good stability.
5. The coal water slurry additive is especially suitable for coal types with high volatile components.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the comb type coal water slurry additive comprises the following components, by weight, 320 parts of sorbitol maleate monomer, 1 part of 2-acrylamide-2-methylpropanesulfonic acid, 3 parts of α -methyl styrene sulfonic acid, 30 parts of acrylic acid, 2.5 parts of ammonium persulfate, 1 part of mercaptopropionic acid aqueous solution, and,
The preparation method of the maleic acid sorbitol ester monomer comprises the following steps: adding 200 parts of maleic anhydride and 100 parts of sorbitol into a reaction kettle, adding 6 parts of p-toluenesulfonic acid, vacuumizing, stirring by using a magnetic stirrer, slowly heating to 90 ℃, reacting at a constant temperature for 4 hours, detecting the esterification degree every 30min, cooling after the esterification degree meets the requirement, and finishing the reaction to obtain the sorbitol maleate monomer.
The preparation method of the comb-type coal water slurry additive comprises the following steps of adding a sorbitol maleate monomer, 2-acrylamide-2-methylpropanesulfonic acid and α -methylstyrene sulfonic acid into a reaction kettle at 65-85 ℃ to prepare an aqueous solution with a certain concentration, dissolving and stirring uniformly, dropwise adding an aqueous solution of acrylic acid, an initiator and a molecular weight regulator into the reaction kettle to perform free radical copolymerization, preserving heat after the reaction is finished, and finally adjusting the pH value with an aqueous solution of sodium hydroxide to obtain the coal water slurry additive.
Example 2:
the comb type coal water slurry additive comprises, by weight, 290 parts of sorbitol maleate monomer, 10 parts of 2-acrylamide-2-methylpropanesulfonic acid, 4 parts of α -methylstyrene sulfonic acid, 60 parts of acrylic acid, 2.5 parts of ammonium persulfate, 3 parts of thioglycolic acid, and a solvent,
The preparation methods of the sorbitol maleate monomer and the comb-type coal water slurry additive are the same as example 1.
Example 3:
the comb type coal water slurry additive comprises, by weight, 290 parts of sorbitol maleate monomer, 12 parts of 2-acrylamide-2-methylpropanesulfonic acid, 5 parts of α -methylstyrene sulfonic acid, 60 parts of acrylic acid, 2.5 parts of potassium persulfate and 5 parts of sodium hypophosphite.
The preparation methods of the sorbitol maleate monomer and the comb-type coal water slurry additive are the same as example 1.
Example 4:
the comb type coal water slurry additive comprises, by weight, 270 parts of sorbitol maleate monomer, 20 parts of 2-acrylamide-2-methylpropanesulfonic acid, 3 parts of α -methylstyrene sulfonic acid, 80 parts of acrylic acid, 4 parts of potassium persulfate, 7 parts of sodium hypophosphite and 1 part of sodium bisulfite.
The preparation methods of the sorbitol maleate monomer and the comb-type coal water slurry additive are the same as example 1.
Example 5:
the comb type coal water slurry additive comprises the following components, by weight, 250 parts of sorbitol maleate monomer, 20 parts of 2-acrylamide-2-methylpropanesulfonic acid, 3 parts of α -methyl styrene sulfonic acid, 100 parts of acrylic acid, 5 parts of ammonium persulfate, 2 parts of mercaptopropionic acid and 3 parts of sodium hypophosphite.
The preparation methods of the sorbitol maleate monomer and the comb-type coal water slurry additive are the same as example 1.
Example 6:
the comb type coal water slurry additive comprises, by weight, 230 parts of sorbitol maleate monomer, 40 parts of 2-acrylamide-2-methylpropanesulfonic acid, 3 parts of α -methylstyrene sulfonic acid, 120 parts of acrylic acid, 1 part of ammonium persulfate, 1 part of mercaptopropionic acid and 3 parts of sodium hypophosphite.
The preparation methods of the sorbitol maleate monomer and the comb-type coal water slurry additive are the same as example 1.
Example 7:
the comb type coal water slurry additive comprises, by weight, 210 parts of sorbitol maleate monomer, 30 parts of 2-acrylamide-2-methylpropanesulfonic acid, 3 parts of α -methylstyrene sulfonic acid, 150 parts of acrylic acid, 2 parts of ammonium persulfate, 2 parts of mercaptopropionic acid and 5 parts of sodium hypophosphite.
The preparation methods of the sorbitol maleate monomer and the comb-type coal water slurry additive are the same as example 1.
Test method and result analysis:
according to GB/T18856.5-2008 water coal slurry test method part 5, a loading method in stability measurement and the experience of ordinary experiments.
By adopting the coal water slurry additive synthesized in the embodiments 1 to 7 of the invention and the common coal water slurry additive sold in the market, the addition amount of the coal water slurry is 1.5 per mill of the total amount of dry coal, and the concentration, the viscosity, the fluidity (expansion degree) and the water precipitation rate are compared by using a small-sized ball mill wet grinding process. The specific experimental method is as follows.
Firstly, concentration experiment:
1. laboratory apparatus
Halogen moisture tester
2. Experimental procedure
① and switching on the power supply of the experimental instrument to dry the tray.
② A sample of 3-5g of coal water slurry was placed on the tray and the start button was pressed to initiate the test.
③ reading A, the concentration of water-coal-slurry is w 100% -A
II, viscosity experiment:
1. laboratory apparatus
BROOKEIELD bohler fly DV1 viscometer, 150ml beaker, usa.
2. Experimental procedure
① the power supply of the experimental instrument is switched on, the level is adjusted and the zero is automatically adjusted.
② the same amount of sample is placed in a 150ml beaker to ensure the temperature and quality of the sample to be measured the beaker is placed under the instrument and the rotor is brought into the sample until the graduation mark on the rotor and the test is started by pressing the start key.
③ the sample viscosity was measured using # 62 rotor at a shear rate of 20. the comparison of viscosity must be done at the same instrument, rotor, speed, vessel, temperature and test time.
Thirdly, fluidity experiment:
1. laboratory apparatus
a. Truncated cone circular die: the diameter of the upper opening is 36mm, the diameter of the lower opening is 60mm, the height is 60mm, and the inner wall of the metal product is smooth and has no seam;
b. glass plates (400X 400mm, thickness 5 mm);
c. straightedge made of steel (300mm)
d. A scraper;
2. experimental procedure
① the glass plate is placed in a horizontal position and wetted with a wet cloth, the truncated cone round mold, the stirrer and the stir pan without water stain.
② the truncated cone circular mold was placed in the center of the glass plate and covered with a wet cloth until use.
③ the water-coal-slurry is quickly poured into the truncated cone mould, and then it is scraped by scraper, and the truncated cone mould is lifted vertically until the water-coal-slurry flows on the glass plate, and the maximum diameters of the two mutually perpendicular directions of the flowing part are measured by a ruler, and the average value is taken as the fluidity of the water-coal-slurry.
Fourthly, water precipitation rate:
1. an experimental instrument: a colorimetric cylinder and a hundredth balance.
2. Test procedure
Putting the prepared coal water slurry into a 100ml colorimetric tube to obtain the quality A of the coal water slurry, standing the coal water slurry for a certain time (t), sucking surface water separation by using a rubber head dropper to obtain the water separation quality B, and calculating the water separation rate according to the following formula.
The water precipitation rate is B/A multiplied by 100%
Selecting blended coal respectively consisting of one or more of magadius coal, black-bang Turke coal, Samonte coal, Xinjiang coal and inner Mongolia coal. The coal quality characteristics and results are shown in tables 1, 2 and 3 below.
Table 1:
table 2:
table 3:
as shown in tables 1 to 3, the coal water slurry additives prepared in examples 1 to 7 have better coal type adaptability, generally higher dispersion ability, low viscosity, good stability and good fluidity, compared with the common coal water slurry additives (naphthalenesulfonic acid-formaldehyde condensate and lignosulfonate) sold in the market, and can be used for preparing high-concentration coal water slurry, wherein examples 2 and 3 have more excellent performance and are most worth popularizing.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. The comb type coal water slurry additive is characterized in that raw materials of the coal water slurry additive comprise, by weight, 320 parts of sorbitol maleate monomer 210-containing, 1-40 parts of 2-acrylamide-2-methylpropanesulfonic acid, 3-5 parts of α -methylstyrene sulfonic acid, 30-150 parts of acrylic acid, 1-5 parts of an initiator and 1-8 parts of a molecular weight regulator.
2. The comb-type coal water slurry additive according to claim 1, wherein the initiator is one or two of ammonium persulfate and potassium persulfate which are mixed in any proportion.
3. The comb-type coal water slurry additive according to claim 1, wherein the molecular weight regulator is one or two of sodium hypophosphite, potassium hypophosphite, sodium bisulfite, thioglycolic acid, mercaptopropionic acid and mercaptoethanol which are mixed in any proportion.
4. The comb-type coal water slurry additive of claim 1, wherein the sorbitol maleate monomer is prepared by the following steps: adding maleic anhydride and sorbitol into a reaction kettle, adding a catalyst, vacuumizing, stirring by using a magnetic stirrer, slowly heating to 80-95 ℃, reacting at a constant temperature for 2-6h, detecting the esterification degree every 30min, cooling after the esterification degree meets the requirement, and finishing the reaction to obtain the sorbitol maleate monomer.
5. The comb-type coal water slurry additive according to claim 4, wherein the mass ratio of the maleic anhydride to the sorbitol is 1-3: 1.
6. the comb-type coal water slurry additive according to claim 4, wherein the catalyst is one or more of sulfuric acid, phosphoric acid and p-toluenesulfonic acid, and the amount of the catalyst is 2-3.0% by mass of maleic anhydride.
7. The preparation method of the comb-type coal water slurry additive of any one of claims 1 to 6, which is characterized by comprising the following steps of adding a sorbitol maleate monomer, 2-acrylamide-2-methylpropanesulfonic acid and α -methylstyrene sulfonic acid into a reaction kettle at the temperature of 65-85 ℃ to prepare an aqueous solution with a certain concentration, dissolving and stirring uniformly, dropwise adding an aqueous solution of acrylic acid, an initiator and a molecular weight regulator into the reaction kettle to perform free radical copolymerization reaction, preserving heat after the reaction is finished, and finally adjusting the pH value by using an aqueous solution of sodium hydroxide to obtain the coal water slurry additive.
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| CN109608593A (en) * | 2018-12-04 | 2019-04-12 | 山西佳维新材料股份有限公司 | A kind of preparation method of polyethers synthesis water reducing type polycarboxylate water-reducer |
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