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Starch graft copolymer coal-water slurry dispersants and preparation method thereof

A technology of starch grafting and dispersing agent, which is applied in the direction of liquid carbon-containing fuel, petroleum industry, fuel, etc., can solve the problems of high pulping cost and high price, and achieve easy biodegradation, reasonable structure and good universality Effect

Inactive Publication Date: 2012-08-08
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing polycarboxylate dispersants are expensive and the cost of pulping is high

Method used

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  • Starch graft copolymer coal-water slurry dispersants and preparation method thereof
  • Starch graft copolymer coal-water slurry dispersants and preparation method thereof
  • Starch graft copolymer coal-water slurry dispersants and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Add 8% cornstarch, 8% potassium persulfate and 60% distilled water into a three-neck flask according to the mass fraction, heat up to 90°C with stirring, stir at constant temperature for 30min, then cool down to 80°C, and adjust the pH to 5-6 get a mixed solution;

[0026] 2) adding mass fraction to the mixed solution is 10% sodium styrene sulfonate and 10% acrylic acid-polyethylene glycol monoester, 4% redox initiator ferrous chloride-hydrogen peroxide, wherein the reducing agent is added once, and the oxidizing agent Add dropwise with a constant pressure dropping funnel, and incubate at 80°C for 2 hours;

[0027] 3) cooling the reactants to room temperature, and adjusting pH=7-9 with sodium hydroxide with a mass concentration of 10%-35% to obtain a starch graft coal water slurry dispersant;

[0028] For the coal water slurry with a concentration of 68% and a dispersant dosage of 0.4% of the slurry, there is no hard precipitation after standing for 15 days.

[002...

Embodiment 2

[0033] 1) Add 20% tapioca starch, 2% oxidant ammonium persulfate and 50% deionized water into a three-necked flask according to the mass fraction, heat up to 90°C under stirring, stir at constant temperature for 20min, then cool down to 75°C, and adjust the pH to 5-6 to obtain a mixed solution;

[0034] 2) adding mass fraction to the mixed solution is 15.7% sodium styrene sulfonate, 10% itaconic acid-polyethylene glycol monoester and 2% redox initiator ferrous sulfate-hydrogen peroxide, wherein the reducing agent is added once, The oxidizing agent is added dropwise with a constant pressure dropping funnel, and after 1-2 hours of reaction, 0.3% of molecular mass regulator dodecyl mercaptan is added, and the reaction is kept at 80°C for 3 hours;

[0035] 3) cooling the reactants to room temperature, and adjusting pH=7-9 with sodium hydroxide with a mass concentration of 10%-35% to obtain a starch graft coal water slurry dispersant;

[0036] For the coal water slurry with a conc...

Embodiment 3

[0041] 1) Add 15% cornstarch, 5% oxidant hydrogen peroxide and 46.9% distilled water into a three-neck flask according to the mass fraction, heat up to 90°C under stirring, stir at constant temperature for 50min, then cool down to 78°C, and adjust the pH to 5-6 to obtain mixture;

[0042] 2) adding mass fraction in mixed solution is 12% sodium styrene sulfonate and 18% maleic acid-polyethylene glycol monoester and 3% redox initiator sodium bisulfite-potassium persulfate, wherein reducing agent One-time addition, the oxidant is added dropwise with a constant pressure dropping funnel, after 1-2 hours of reaction, add 0.1% molecular weight regulator dodecyl mercaptan, and keep the reaction at 80°C for 5 hours;

[0043] 3) cooling the reactants to room temperature, and adjusting pH=7-9 with sodium hydroxide with a mass concentration of 10%-35% to obtain a starch graft coal water slurry dispersant;

[0044] For the coal water slurry with a concentration of 68% and a dispersant dos...

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Abstract

The invention provides a preparation method of starch graft copolymer coal-water slurry dispersants. After oxidation modification of starch, in a redox system, sodium p-styrene sulfonate and a large monomer are introduced to a starch chain through free radical polymerization reaction to compound a series of coal-water slurry dispersants with excellent performance and unique characteristics. Chief constituents of the starch graft copolymer coal-water slurry dispersants are as follows, by mass: 8-20% of starch, 2-8% of oxidants, 10-30% of monomers and 2-4% of initiators. The starch graft copolymer coal-water slurry dispersants prepared by the method are brown sticky emulsion, the solid content is 26-38%, the pH value is 7-9, and the viscosity is 40-130mPa.s. The preparation method of the starch graft copolymer coal-water slurry dispersants exploits the advantages of strong dispersity of the sodium p-styrene sulfonate and carboxylate to the full and combines effects of hydrogen bond in water molecules and polyhydroxy on a starch straight chain and the space steric hindrance effect of a long chain of the large monomer to enable coal-water slurry to have good dispersion perfoamance and good storage stability. The dispersants can achieve biodegradation and have low toxicity, and raw materials of the dispersants are easy to obtain and low in cost.

Description

technical field [0001] The invention relates to a preparation method of a coal water slurry dispersant, and relates to a starch grafted coal water slurry dispersant and a preparation method thereof. Background technique [0002] CWS is an emerging industry in my country, and CWS dispersant is one of the additives to be used in large quantities in CWS combustion, gasification and transportation projects, especially for the preparation of CWS with high concentration and good stability. The role of additives is particularly critical. At present, CWS dispersants mainly include naphthalene-based, humic acid-based, lignin-based, polyolefin-based, acrylic-based and related compound products. Although naphthalene-based dispersants are cheap, have good dispersibility, and have a strong viscosity-reducing effect, they are prone to water separation and produce hard precipitates, and have certain toxicity. Lignosulfonate has poor performance and is generally used in combination with ot...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F212/14C08B31/18C10L1/24C10L1/32
Inventor 张光华赵方朱军峰李俊国
Owner SHAANXI UNIV OF SCI & TECH
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