Dispersing agent containing composite long-short side chain polycarboxylate and RAFT (Reversible Addition-Fragmentation chain Transfer) synthesis method of aqueous solution thereof

A technology of chain polycarboxylate and synthesis method, applied in liquid carbon-containing fuel, petroleum industry, fuel and other directions, can solve the problems of unstable dispersion effect of dispersant, high water separation rate, unclear structure, etc., and achieve dispersibility. And the effect of good stability, good dispersion performance and clear structure

Inactive Publication Date: 2018-03-23
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the synthesis methods of dispersants adopt the method of free radical polymerization in aqueous solution, but the structure of the polymerized dispersant is not clear enough, and it is not possible to study the influence of dispersant on the performance of coal water slurry from the structure of the dispersant.
The structure of the existing coal water slurry dispersant is not clear, and the synthetic route of the dispersant cannot be effectively guided from the structural design
Moreover, the dispersion effect of some dispersants is unstable, the water separation rate is high, and the storage stability needs to be improved, which seriously affects its popularization.

Method used

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  • Dispersing agent containing composite long-short side chain polycarboxylate and RAFT (Reversible Addition-Fragmentation chain Transfer) synthesis method of aqueous solution thereof
  • Dispersing agent containing composite long-short side chain polycarboxylate and RAFT (Reversible Addition-Fragmentation chain Transfer) synthesis method of aqueous solution thereof
  • Dispersing agent containing composite long-short side chain polycarboxylate and RAFT (Reversible Addition-Fragmentation chain Transfer) synthesis method of aqueous solution thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] 1) First synthesize RAFT (reversible addition-fragmentation chain transfer) reagent BDATT (S-S'-bis(a,a'-dimethyl-a"-acetic acid)-trithiocarbonate): Put 30ml of petroleum Ether was added to a 500mL flask as a solvent, and the CS 2 (6.85g, 0.09mol), chloroform (26.88g, 0.225mol), acetone (13.08g, 0.225mol) and tetrabutylammonium bisulfate (0.6g, 1.775mmol) were mixed into the flask, under nitrogen protection Cool under tap water. In order to keep the temperature below 25°C, a 50% NaOH (50.4 g, 0.63 mol) aqueous solution was added dropwise over 90 minutes, and the reaction was stirred for 12 hours. Then add 225ml of water to dissolve the solid, then add 30ml of concentrated hydrochloric acid to acidify the liquid, stir for 30 minutes under the protection of nitrogen, and adjust the pH to about 7. The solid was obtained by filtration, washed with water, and dried to a constant weight to obtain a khaki product. Finally, it was purified by stirring in a solution of tolue...

Embodiment 2

[0044] 1) First synthesize RAFT (reversible addition-fragmentation chain transfer) reagent BDATT (S-S'-bis(a,a'-dimethyl-a"-acetic acid)-trithiocarbonate): Put 60ml of petroleum Ether was added to a 1000mL flask as a solvent, and the CS 2 (13.79g, 0.18mol), chloroform (53.75g, 0.45mol), acetone (26.15g, 0.45mol) and tetrabutylammonium bisulfate (1.205g, 3.55mmol) were mixed and added to the flask, under nitrogen protection Cool under tap water. In order to keep the temperature below 25°C, 50% NaOH (100.8 g, 1.26 mol) aqueous solution was added dropwise within 90 minutes, and the reaction was stirred for 12 hours. Then add 450ml of water to dissolve the solid, then add 60ml of concentrated hydrochloric acid to acidify the liquid, stir for 30 minutes under nitrogen protection, and adjust the pH to about 7. The solid was obtained by filtration, washed with water, and dried to a constant weight to obtain a khaki product. Finally, it was purified by stirring in a solution of tolue...

Embodiment 3

[0048] 1) First synthesize RAFT (reversible addition-fragmentation chain transfer) reagent BDATT (S-S'-bis(a,a'-dimethyl-a"-acetic acid)-trithiocarbonate): Put 30ml of petroleum Ether was added to a 500mL flask as a solvent, and the CS 2 (6.85g, 0.09mol), chloroform (26.88g, 0.225mol), acetone (13.08g, 0.225mol) and tetrabutylammonium bisulfate (0.6g, 1.775mmol) were mixed into the flask, under nitrogen protection Cool under tap water. In order to keep the temperature below 25° C., a 50% NaoH (50.4 g, 0.63 mol) aqueous solution was added dropwise over 90 minutes, and the reaction was stirred for 12 hours. Then add 225ml of water to dissolve the solid, then add 30ml of concentrated hydrochloric acid to acidify the liquid, stir for 30 minutes under the protection of nitrogen, and adjust the pH to about 7. The solid was obtained by filtration, washed with water, and dried to a constant weight to obtain a khaki product. Finally, it was purified by stirring in a solution of tol...

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Abstract

The invention discloses a dispersing agent containing composite long-short side chain polycarboxylate and an RAFT (Reversible Addition-Fragmentation chain Transfer) synthesis method of aqueous solution thereof. The RAFT synthesis method comprises the following steps: 1) firstly synthesizing an RAFT reagent BDATT; 2) adding APEGn monomers, sulfonic monomers and water into a beaker, then mixing water and a proper amount of RAFT reagent for dissolving, adding acrylic monomers into a mixture, dripping the mixture and a water-soluble initiator solution into the beaker at a constant speed, and afterthe dripping is finished, continuously stirring to react for about 4 to 5 hours at a constant temperature; 3) uniformly dripping the APEGm aqueous solution into a reaction product from the former step, simultaneously dripping an initiator solution, stirring to react for 4 to 5 hours after the dripping is finished, and regulating pH to 7.0 after reaction is ended to obtain a dispersing agent solution containing the composite long-short side chain polycarboxylate. The dispersing agent disclosed by the invention has the advantages that the dispersing property is excellent and the storage stability of prepared water coal slurry is higher.

Description

technical field [0001] The invention relates to the technical field of coal water slurry additives, in particular to a polycarboxylate dispersant containing composite long and short side chains and a RAFT synthesis method for its aqueous solution. Background technique [0002] Coal water slurry is a coal-water mixture composed of 50%-70% coal, 29%-49% water and 1% dispersant. It is a new clean fuel that can replace heavy oil and coal. In various industrial applications, coal water slurry has a combustion efficiency of over 99%, and can be used in industrial boilers, power plant boilers and industrial kilns instead of oil or coal and gas. Coal-water slurry does not pollute the environment during storage and transportation, and is non-flammable and non-explosive during storage and transportation, and is safe and reliable. The coal water slurry dispersant can disperse the coal particles uniformly in the coal water system, reduce the viscosity of the coal water slurry system an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02C08F283/06C08F212/14C08F228/02C08F220/58C08F220/06C08F220/18C08F212/08C10L1/198C10L1/238C10L1/24
CPCC10L1/198C10L1/238C10L1/2475C08F283/065C08G81/025C08F2438/03C08F220/585C08F212/14C08F220/18
Inventor 朱军峰王佩拓欢李俊国张万斌张光华
Owner SHAANXI UNIV OF SCI & TECH
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