Preparation method of alkali lignin modified polycarboxylic acid-type coal water slurry dispersant

A technology based on alkali lignin and polycarboxylic acid is applied in the field of preparation of coal-water slurry dispersant, which can solve the problems of complex synthesis process, high dispersant dosage, complex preparation process, etc., and achieve simple production process, wide sources, Inexpensive effect

Active Publication Date: 2015-02-04
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The lignin-based dispersant has good pulping stability, less water separation, and only produces soft sediment. The disadvantage is that the pulping viscosity is relatively high and the flow pattern is rough, so it is often used in combination with other dispersants.
Chinese invention patent CN102161923A obtains a modified lignin-based coal-water slurry dispersant by reacting lignosulfonate with polyphosphate (sodium tripolyphosphate or sodium hexametaphosphate) and a polymer additive (also known as a stabilizer). The concentration of coal water slurry is improved, but the d

Method used

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  • Preparation method of alkali lignin modified polycarboxylic acid-type coal water slurry dispersant
  • Preparation method of alkali lignin modified polycarboxylic acid-type coal water slurry dispersant
  • Preparation method of alkali lignin modified polycarboxylic acid-type coal water slurry dispersant

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Experimental program
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Effect test

Embodiment 1

[0031] Dissolve 120g of methylbutenol polyoxyethylene ether, 3g of sodium 2-acrylamide-2-methylpropanesulfonate, and 18g of acrylic acid in water to prepare an aqueous solution with a mass concentration of 50%. When the temperature rises to 75°C, drop Add an aqueous solution with a mass concentration of 2% formed by 2g of initiator potassium persulfate, add dropwise for 2h, continue to keep warm for 2h after the dropwise addition, adjust the temperature to 45°C, add 6g of epichlorohydrin, and react for 0.5h. It is 11 to regulate pH with the NaOH that mass concentration is 30%, add the mass concentration that is made in the aqueous solution that is 11 by 80g wood pulp alkali lignin and be made into in the aqueous solution that pH is 11, be warming up to 75 ℃, add dropwise by 2g The mass solubility that potassium sulfate, 1g sodium sulfite is made into is the aqueous solution of 2%, reacts 2.5h, and the alkali lignin modified polycarboxylate high-efficiency coal-water slurry disp...

Embodiment 2

[0033] Dissolve 100g polyethylene glycol monomethyl ether, 6g sodium methacrylate, and 10g maleic anhydride in water to prepare an aqueous solution with a mass concentration of 50%. After the temperature rises to 50°C, add 2g of initiator dropwise Potassium sulfate is made into an aqueous solution with a mass concentration of 2%, and the dropwise addition time is 2h. After the dropwise addition, continue the heat preservation reaction for 2h, adjust the temperature to 50°C, add 6g of epichlorohydrin, and react for 0.5h with a mass concentration of 30%. NaOH is used to adjust the pH to 10, adding an aqueous solution having a mass concentration of 30% formed by dissolving 60g reed alkali lignin in an aqueous solution having a pH of 10, raising the temperature to 70°C, adding 2g ammonium cerium nitrate, 1g ammonium persulfate dropwise Prepare an aqueous solution with a mass solubility of 2%, react for 2 hours, and obtain an alkali-lignin modified polycarboxylic acid-based high-eff...

Embodiment 3

[0035] Dissolve 120g of propylene alcohol polyoxyethylene ether, 8g of sodium styrene sulfonate, and 12g of methacrylic acid in water to prepare an aqueous solution with a mass concentration of 50%. After the temperature rises to 80°C, add 3g of initiator ammonium persulfate dropwise Prepare the aqueous solution with a mass concentration of 2%, add it dropwise for 2 hours, continue to keep warm for 2 hours after the dropwise addition, adjust the temperature to 40°C, add 8g of epichlorohydrin, react for 1 hour, and adjust with NaOH with a mass concentration of 30%. When the pH is 12, add an aqueous solution with a mass concentration of 30% prepared by dissolving 90g of bamboo alkali lignin in an aqueous solution with a pH of 12, heat up to 80°C, and add dropwise a mixture of 2g of ammonium persulfate and 1g of sodium thiosulfate. The mass solubility is 2% aqueous solution, react for 2 hours, and the alkali lignin modified polycarboxylate high-efficiency coal-water slurry dispers...

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Abstract

The invention relates to a preparation method of an alkali lignin modified polycarboxylic acid-type high-efficiency coal water slurry dispersant. The method comprises the steps: at the temperature of 50-80 DEG C, carrying out a copolymerization reaction of a polyoxyethylene ether macromonomer, an unsaturated carboxylic acid monomer, an unsaturated sulfonate monomer and an initiator for 2-3 h in an aqueous solution, adjusting the temperature to 30-50 DEG C, adding epoxy chloropropane, carrying out a reaction for 0.5-1 h, adding an alkaline regulator, adjusting the pH value to 10-12, adding an alkali lignin solution with the mass concentration of 20-50%, adjusting the reaction temperature to 60-80 DEG C, dropwise adding a composite initiator aqueous solution with the mass concentration of 2%, carrying out a reaction for 1-3 h, and thus obtaining a liquid product. The product has the dispersion viscosity reduction performance on coal water slurry superior to that of a naphthalenesulfonate formaldehyde condensation compound, and has good dispersion stability on coal slurry; and while original dispersive ability and other characteristics of the polycarboxylic acid-type dispersant are maintained, the production cost is reduced, and the usage amount of non-renewable resources and toxic materials is lowered.

Description

technical field [0001] The invention relates to a preparation method of a coal-water slurry dispersant, in particular to a preparation method of an alkali lignin-modified polycarboxylic acid-based high-efficiency coal-water slurry dispersant, which is suitable for coal types of different coal ranks. Background technique [0002] Coal water slurry is a new type of fuel that uses physical methods to liquefy coal. It is prepared from coal (about 70%) with a certain particle size, water (about 30%) and a small amount of additives. In recent years, due to abundant coal resources, cheap price, simple processing method of coal water slurry, less investment and low cost compared with coal gasification and liquefaction, it has been widely valued as an oil substitute fuel by countries all over the world. CWS with industrial application value should have high concentration, low viscosity, good fluidity and stability. For this reason, an appropriate amount of chemical additives should ...

Claims

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Application Information

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IPC IPC(8): C08H7/00C08F283/06C08F220/58C08F220/06C08F222/06C08F212/14C08G81/02C10L1/32
Inventor 邱学青易聪华洪南龙杨东杰周明松李远
Owner SOUTH CHINA UNIV OF TECH
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