Modified lignin sulfosalt dispersant of water coal slurry

A lignosulfonate and dispersant technology, applied in chemical instruments and methods, liquid carbon-containing fuels, transportation and packaging, etc., can solve problems such as difficult to meet production requirements, strict coal type requirements, and naphthalene carcinogenicity, and achieve Low cost, good fluidity, anti-flocculation effect

Inactive Publication Date: 2003-03-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Anionic coal-water slurry dispersant: (1) Polynaphthalene sulfonate series: NDF and FDN, which are widely used in China, belong to this series. High, and naphthalene is carcinogenic
(2) Lignosulfonate: It mainly comes from the reprocessing of papermaking waste liquid. Its biggest advantage is that it is rich in raw materials, easy to process, and cheap in price. The disadvantage is that its performance is average and it is difficult to meet production requirements.
(3) Humic acid salt series: many characteristics are similar to lignin, and its dispersibility is better than that of lignosulfonate, but the stability of pulp is poor, and it is easy to produce hard deposits that are difficult to redisperse
(4) Polyolefin series such as: polystyrene sulfonate, sulfamic acid salt, polymer sodium salt of maleic acid and various cyclopentadiene, copolymer of acrylate, polydiene sulfonate isobutylene and cis Butenedioic anhydride polymer sodium salt, etc., they generally have a good dispersion and stabilization effect on low-ash coal-water slurry, but they need to strictly control the molecular weight and distribution, and the price is high, and the requirements for coal types are strict
Lignin molecules contain ether bonds, carbon-carbon double bonds, phenolic hydroxyl groups, carbonyl groups and benzene rings, etc., which have certain dispersion stability for coal-water slurry, but the performance is not ideal

Method used

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  • Modified lignin sulfosalt dispersant of water coal slurry
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  • Modified lignin sulfosalt dispersant of water coal slurry

Examples

Experimental program
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Effect test

Embodiment 1

[0032] First, take 3000 grams of lignosulfonate solution with a solid content of 40%, add 30 grams of KOH and 100 grams of acrylic acid, adjust the pH value to 10-11, then heat to 80 ° C while stirring, and then add the initiator FeCl 2 2.2 g, Cu(NO 3 ) 2 1.8 g and oxidant KMnO 4 30 grams, catalytic reaction for 8 hours; finally add 50 grams of polyacrylic acid (molecular weight: 2500) and 5 grams of silicone oil, stir rapidly for 30 minutes, obtain liquid dispersant product after cooling, and then dry to obtain powder.

Embodiment 2

[0034] First take 2500 grams of lignosulfonate solution with a solid content of 40%, add 30 grams of NaOH, 200 grams of formaldehyde, and 200 grams of benzylphenol, adjust the pH value to 9-10, and then heat to 60 ° C while stirring, Then add initiating catalyst FeCl 2 3 g and oxidizer H 2 o 2 30 grams, catalyzed reaction for 1 hour; finally add 50 grams of polyacrylic acid (molecular weight 2500) and 2 grams of silicone oil, stir rapidly for 30 minutes, after cooling, the liquid product of coal water slurry dispersant is obtained, and then dried to obtain powder.

Embodiment 3

[0036] First, take 2000 grams of lignosulfonate solution with a solid content of 50%, add 40 grams of NaOH and 60 grams of acrylic acid, adjust the pH value to 9-10.5, then heat to 80 ° C while stirring, and then add the initiator FeCl 2 1 g, FeSO 4 1 g and oxidizing agent H 2 o 2 30 grams, catalytic reaction for 3 hours; finally add 3 grams of butanol, stir rapidly for 30 minutes, after cooling, the liquid product of coal-water slurry dispersant is obtained, and then dried to obtain powder.

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Abstract

The preparation method of dispersing agent for water-coal slurry by using lignin sulfonate-by-product obtained by pulping for making paper includes the following steps: chemical modification, adding alkali in lignin sulfonate solution at 50-85 deg.c to regulate pH value of 8-11.5, adding catalyst, oxidant, anchor group and solvation chain and making them produce reaction for 1-10 hr., and compounding modification, adding modifying agent, stirring for 10-60 min. and cooling so as to obtain liquid product of the dispersing agent. Said invention can modify the lignin sulfonate into the additive with double action of dispersion and stabilization for water-coal slurry.

Description

technical field [0001] The invention relates to an additive for coal water slurry, more specifically, relates to making a low-cost coal water slurry dispersant by using lignin sulfonate, a by-product of pulp and papermaking. Adding a small amount of the dispersant can prevent the coal-water slurry from hard precipitation for 3-5 months, and it still has good fluidity and atomization when the coal powder content is as high as 73%. [0002] The invention also relates to a preparation method of the coal water slurry dispersant. Background technique [0003] Coal water slurry is a new type of coal-based fluid fuel that appeared in the early 1980s. It contains about 60-70% coal, about 1% chemical additives, and the rest is water. It transforms coal from a traditional solid fuel into a fluid fuel that can be pumped, atomized, stored and ignited stably like oil. Two tons of coal water slurry can replace one ton of oil. Since the price of coal-water slurry is only about 1 / 2 of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K23/50C10L1/32
Inventor 邱学青王卫星欧阳新平杨东杰
Owner SOUTH CHINA UNIV OF TECH
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