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Coal water slurry dispersing agent made from black-liquor of straw pulping in paper-making and preparation thereof

A papermaking black liquor and dispersant technology, applied in chemical instruments and methods, dissolution, chemical/physical processes, etc., can solve the problems that restrict the popularization and application of lignin-based coal-water slurry dispersants, and the poor viscosity-reducing performance of coal-water slurry dispersion. , It is difficult to meet the production requirements and other problems, and achieve the effects of excellent dispersion and viscosity reduction performance, excellent slurry stability and low production cost.

Inactive Publication Date: 2008-12-17
SOUTH CHINA UNIV OF TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Naphthalene sulfonate condensation polymers of various substituents [CN1209439; US4282006; US4330301], the widely used naphthalene-based NDF products in China belong to this series, which has the advantage of strong ability to disperse and reduce viscosity, but poor slurry stability, It is easy to separate water and produce hard precipitation, and the price is high
(2) Lignosulfonate [CN1404912], mainly derived from papermaking waste liquid, its greatest advantage is abundant raw materials and low price, but its disadvantages are complex raw materials, unstable performance, and difficult to meet production requirements
(3) Humic acid salt series [such as CN1298927; CN1069759], its ability to disperse and reduce viscosity is good, but the stability of the slurry is poor, and it is easy to produce hard deposits
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
(5) Polycarboxylic acid series, which is formed by graft copolymerization of unsaturated carboxylic acid monomers such as (meth)acrylic acid, sodium maleate and other monomers. It is an efficient dispersant for coal water slurry, but the price higher
Because lignin has a spherical complex molecular structure and a wide range of molecular weight distribution, lignosulfonate prepared by traditional sulfonation has the disadvantages of low sulfonation degree and low molecular weight, and the prepared lignosulfonic acid with spherical structure The adsorption of salt on the surface of coal particles is not firm, and the dispersion and viscosity reduction performance of coal water slurry is not good
Therefore, the limitations of modification technology restrict the popularization and application of lignin-based CWS dispersants

Method used

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  • Coal water slurry dispersing agent made from black-liquor of straw pulping in paper-making and preparation thereof
  • Coal water slurry dispersing agent made from black-liquor of straw pulping in paper-making and preparation thereof
  • Coal water slurry dispersing agent made from black-liquor of straw pulping in paper-making and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]Get 15 grams of urea and dissolve it in 50 grams of water, join in 200 grams of wheat straw pulp concentrated black liquor (solid content 55%, wherein lignin content 26.5%, effective alkali content 24.6%, ash content 11.2%), add sodium hydroxide to adjust pH to 10.5, during which 20 g of formaldehyde was added dropwise, and then reacted at 80° C. for 1 hour to obtain an intermediate reaction solution A. Dissolve 25 grams of ammonium sulfite in 46.5 grams of water, add 15 grams of acetylacetone, after fully dissolved, add sulfuric acid to adjust the pH to 9, react at 50°C for 0.8 hours, add 10 grams of glyoxal, and react at 65°C for 1 hour , to obtain the intermediate reaction solution B. The intermediate reaction solution A and the intermediate reaction solution B were mixed, sodium hydroxide was added to adjust the pH to 11, 15 g of formaldehyde was added dropwise, and the polycondensation reaction was carried out at 85° C. for 3 hours. After the reaction is completed,...

Embodiment 2

[0037] Get 10 grams of dimethyl urea and dissolve it in 20 grams of water, join in 200 grams of straw pulp concentrated black liquor (solid content 55%, wherein lignin content 26.5%, effective alkali content 24.6%, ash content 11.2%), add sulfuric acid Adjust the pH to 10, add 20 g of acetaldehyde dropwise during this process, and then react at 90° C. for 1.5 hours to obtain an intermediate reaction solution A. Dissolve 50 grams of sodium metabisulfite in 120 grams of water, add 20 grams of acetone, add sodium hydroxide to adjust the pH to 11 after the dissolution is complete, react at 70°C for 0.5 hours, add 10 grams of formaldehyde, and react at 50°C for 0.7 hours to obtain Intermediate reaction solution B. The intermediate reaction solution A and the intermediate reaction solution B were mixed, sodium hydroxide was added to adjust the pH to 10.5, 10 g of formaldehyde was added dropwise, and the polycondensation reaction was carried out at 90° C. for 3 hours. After the reac...

Embodiment 3

[0039] Get 20 grams of acetone in 50 grams of water, join in 200 grams of wheat straw pulp concentrated black liquor (solid content 55%, wherein lignin content 26.5%, effective alkali content 24.6%, ash content 11.2%), add sodium hydroxide to adjust pH To 12, 20 grams of polyoxymethylene was added dropwise during this process, and then reacted at 75° C. for 2 hours to obtain an intermediate reaction solution A. Dissolve 15 grams of sodium bisulfite and 25 grams of sodium sulfite mixture in 80 grams of water, add 12 grams of acetophenone, add sulfuric acid to adjust the pH to 10.5 after the dissolution is complete, react at 85 ° C for 1 hour, add 10 grams of formaldehyde, at 55 The reaction was carried out at ℃ for 0.6 hours to obtain the intermediate reaction solution B. The intermediate reaction solution A and the intermediate reaction solution B were mixed, sodium hydroxide was added to adjust the pH to 11, 14 g of glutaraldehyde was added dropwise, and the polycondensation ...

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Abstract

The invention discloses a straw pulp papermaking black liquor water-coal slurry dispersant and a preparation method thereof. The prescription of the water-coal slurry dispersant is counted by mass portion and includes 20 portions of condensed straw pulp papermaking black liquor of 50 to 60 percent; 25 to 50 portions of aldehydes, 20 to 60 portions of carbonyl compounds and 25 to 50 portions of sulfonating agents. The preparation method thereof is to prepare the water-coal slurry dispersant by carrying out graft sulfonation and polycondensation on the condensed straw pulp papermaking black liquor, the aldehydes, the carbonyl compounds and a sulfonating agent. The materials of the invention have abundant sources and low cost; the production cost is low; the water-coal slurry dispersant prepared by the invention has excellent water solubility and surface activity as well as excellent slurry preparing performance to the water-coal slurry under a lower addition; the dispersing viscosity reduction performance of the water-coal slurry dispersant is far superior to lignin sulfonate; aiming at different coal varieties, the water-coal slurry dispersant achieves or exceeds the efficiency of naphthyl sulfonate formaldehyde condensate; besides, the anti-shearing performance of a slurry body is excellent; the application range to the coal varieties is broad; the water-coal slurry dispersant is novel, effective and environment-friendly.

Description

technical field [0001] The invention relates to a coal-water slurry dispersant, in particular to a high-efficiency coal-water slurry dispersant for straw pulp papermaking black liquor and a preparation method thereof. Specifically, a black liquor coal-water slurry dispersant with high molecular weight and high sulfonation degree is prepared by grafting sulfonation and polycondensation reaction under normal pressure using the concentrated black liquor of straw pulp alkaline papermaking as raw material. Background technique [0002] Coal water slurry is a coal-based fluid fuel prepared by physical methods. It is prepared from coal with a certain particle size (about 60% to 70%), water (about 30% to 40%) and a small amount of dispersant. The dispersant is the key to the preparation of high-concentration coal-water slurry. A small amount of dispersant is adsorbed on the coal-water interface to disperse the hydrophobic coal particles in the water, so that the coal-water slurry ha...

Claims

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Application Information

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IPC IPC(8): B01F17/50C08H5/02C09K23/50
Inventor 邱学青周明松杨东杰楼宏铭欧阳新平
Owner SOUTH CHINA UNIV OF TECH
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