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Amphiprotic humic acid grafted copolymer coal water slurry dispersing agent as well as preparation and application thereof

A technology of graft copolymer and humic acid, which is applied in the direction of liquid carbon-containing fuel, petroleum industry, fuel, etc., can solve the problems of poor hydrophilicity, poor stability, and good dispersibility, so as to reduce surface free energy and achieve good adsorption effect , the effect of increasing the relative molecular mass

Inactive Publication Date: 2014-12-10
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to previous research results, it was found that when humic acid is used as a coal-water slurry dispersant, it has the problem of good dispersibility but poor hydrophilicity and stability. The focus of the research

Method used

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  • Amphiprotic humic acid grafted copolymer coal water slurry dispersing agent as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Add 30g of humic acid and 70g of water into a three-necked flask equipped with a stirrer, condenser, dropping funnel and thermometer, then add 30% sodium hydroxide to adjust the pH to 9-10, and stir to dissolve.

[0020] (2) Dissolve 4g of allyl polyethylene glycol-400 in 40g of water, add 12g of sodium allyl sulfonate, 4g of methacryloxyethyltrimethylammonium chloride, stir and dissolve to obtain a mixed monomer solution ;

[0021] (3) when the humic acid aqueous solution of step (1) is warming up to 80 ℃, start to drop 20g mass fraction and be the mixed monomer solution that the potassium persulfate solution of 10% and step (2) prepare, control its rate of addition After 1 hour of dripping, keep the reaction for 2.5 hours after the dropwise addition.

[0022] (4) Cool the reactant to room temperature, filter and discharge the product, dry and pulverize the product to obtain a powdery amphoteric humic acid-based graft copolymer solid.

Embodiment 2

[0024] (1) Add 60 g of humic acid and 140 g of water into a three-necked flask equipped with a stirrer, condenser, dropping funnel, and thermometer, then add 30% sodium hydroxide to adjust the pH to 9-10, and stir to dissolve.

[0025] (2) Dissolve 6g of allyl polyethylene glycol-1000 in 40g of water, add 12g of sodium methacrylate, 2g of methacryloxyethyltrimethylammonium chloride, stir and dissolve to obtain a mixed monomer solution ;

[0026] (3) When the humic acid aqueous solution of step (1) is warming up to 75 DEG C, start to drop 24g mass fraction and be the ammonium persulfate solution of 10% and the mixed monomer solution prepared by step (2), control the rate of addition for 1h After dropping, keep warm for 4 hours after dropping.

[0027] (4) Cool the reactant to room temperature, filter the material, and dry and pulverize the product to obtain a powdery amphoteric humic acid-based graft copolymer solid.

Embodiment 3

[0029] (1) Add 30g of humic acid and 70g of water into a three-necked flask equipped with a stirrer, condenser, dropping funnel and thermometer, add 30% sodium hydroxide to adjust the pH to 9-10, and stir to dissolve.

[0030] (2) Dissolve 7.5g of allyl polyethylene glycol-800 in 40g of water, add 18g of sodium acrylate, 4.5g of methacryloxyethyltrimethylammonium chloride, stir and dissolve to obtain a mixed monomer solution;

[0031] (3) When the humic acid aqueous solution of step (1) is warming up to 75 DEG C, start to drop 36g mass fraction and be the ammonium persulfate solution of 10% and the mixed monomer solution prepared by step (2), control the rate of addition for 1h After dropping, keep warm for 4 hours after dropping.

[0032] (4) Cool the reactant to room temperature, filter the material, and dry and pulverize the product to obtain a powdery amphoteric humic acid-based graft copolymer solid.

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Abstract

The invention discloses a method for preparing an amphiprotic humic acid grafted copolymer coal water slurry dispersing agent. The method comprises the following steps: adding an 30% humic acid aqueous solution into a three-necked flask in which a stirrer, a condenser pipe, a dropping funnel and a thermometer are arranged, regulating the pH value to 9-10 by using an alkaline regulator, stirring and dissolving; raising the temperature to 65-85 DEG C, respectively dropping an initiator solution and a mixed monomer solution consisting of an anionic monomer, a cationic monomer and a polyether macromonomer, controlling the dropping rate until the dropping operation is finished within 1-1.5 hours, and preserving the temperature and reacting for 3-5 hours after the operation is ended; and finally, cooling the reactant to room temperature, filtering, discharging, drying and grinding. The dispersing agent prepared by the method has the characteristics of good dispersing effect, high stability and low cost and can be used for preparing various kinds of high-concentration coal water slurry.

Description

technical field [0001] The invention belongs to the technical field of coal-water slurry dispersant, in particular to an amphoteric humic acid graft copolymer coal-water slurry dispersant and its preparation and application. Background technique [0002] Coal-water slurry is a low-pollution liquid fuel developed in the late 1970s and early 1980s that replaces oil and coal with coal, and its combustion efficiency can reach more than 99%. It is a slurry made of about 70% coal, about 30% water, and a small amount of chemical additives through physical processing. It has the same fluidity and stability as heavy oil; it can be pumped, atomized and ignited stably; its calorific value is about half that of fuel oil. The development of coal water slurry technology in my country is of great significance. Firstly, coal water slurry can replace fuel oil, which has remarkable economic benefits and great strategic significance; As the gasification fuel of the Texaco furnace, it is used ...

Claims

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Application Information

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IPC IPC(8): C08F291/12C08F291/08C08F220/06C08F228/02C08F212/14C08F220/34C10L1/32
Inventor 张光华葛磊李俊国朱军锋
Owner SHAANXI UNIV OF SCI & TECH
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