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Method of preparing surfactant by alkali lignin by modification

A technology of surfactant and alkali lignin, applied in chemical instruments and methods, transportation and packaging, dissolution, etc., can solve the problems of long route and complicated reaction process, and achieve simple reaction process, easy reaction conditions and good industrial application foreground effect

Inactive Publication Date: 2014-04-30
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese invention patent CN103254882A prepares surfactant by oxidation, sulfonation, amination, and alkylation of alkali lignin. The reaction process is complex and the route is long. The sulfonation reaction needs to be carried out at high temperature (150-200°C).

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Add 8g of alkali lignin, 8g of dodecyl glycidyl ether, and 1.6g of N,N-dimethylbenzylamine into 160mL of dimethyl sulfoxide, raise the temperature to 120°C for 5 hours, and adjust with hydrochloric acid solution The pH value is 2, the dimethyl sulfoxide is removed by distillation under reduced pressure, the obtained product is washed with water and petroleum ether, and then dried at 60°C for 24 hours to obtain modified lignin;

[0019] (2) Dissolve 1 g of the above-mentioned modified lignin in 20 mL of dichloromethane to obtain a first solution, and dissolve 2 g of chlorosulfonic acid in 20 mL of dichloromethane to obtain a second solution. Control the temperature of the first solution to 0°C, add the second solution dropwise to the first solution for sulfonation reaction, adjust the pH to 8 with sodium hydroxide solution after reacting for 2 hours, and stir for 1 hour. Afterwards, it was dialyzed with a dialysis bag with a molecular weight cut-off of 3000 Da, and t...

Embodiment 2

[0022] (1) Add 8g of alkali lignin, 8g of dodecyl glycidyl ether, and 1.6g of N,N-dimethylbenzylamine into 160mL of dimethyl sulfoxide, raise the temperature to 110°C for 5 hours, and adjust with hydrochloric acid solution The pH value is 2, the dimethyl sulfoxide is removed by distillation under reduced pressure, the obtained product is washed with water and petroleum ether, and then dried at 60°C for 24 hours to obtain modified lignin;

[0023] (2) Dissolve 1 g of the above-mentioned modified lignin in 20 mL of dichloromethane to obtain a first solution, and dissolve 2 g of chlorosulfonic acid in 20 mL of dichloromethane to obtain a second solution. Control the temperature of the first solution to 0°C, add the second solution dropwise to the first solution for sulfonation reaction, adjust the pH to 8 with sodium hydroxide solution after reacting for 2 hours, and stir for 1 hour. Afterwards, it was dialyzed with a dialysis bag with a molecular weight cut-off of 3000 Da, and t...

Embodiment 3

[0026] (1) Add 8g of alkali lignin, 8g of dodecyl glycidyl ether, and 1.6g of N,N-dimethylbenzylamine into 160mL of dimethyl sulfoxide, raise the temperature to 120°C for 5 hours, and adjust with hydrochloric acid solution The pH value is 2, the dimethyl sulfoxide is removed by distillation under reduced pressure, the obtained product is washed with water and petroleum ether, and then dried at 60°C for 24 hours to obtain modified lignin;

[0027] (2) Dissolve 1 g of the above-mentioned modified lignin in 20 mL of dichloromethane to obtain a first solution, and dissolve 0.5 g of chlorosulfonic acid in 20 mL of dichloromethane to obtain a second solution. Control the temperature of the first solution to 0°C, add the second solution dropwise to the first solution for sulfonation reaction, adjust the pH to 8 with sodium hydroxide solution after reacting for 0.5 hours, and stir for 1 hour. Afterwards, it was dialyzed with a dialysis bag with a molecular weight cut-off of 3000 Da, a...

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Abstract

The invention relates to a method of preparing a surfactant by alkali lignin by modification, belonging to the technical field of lignin utilization. The method comprises the following steps: by taking waste alkali lignin in industrial production as a raw material, first, carrying out reaction with dodecyl glycidyl ether and N, N-dimethylbenzylamine in dimethylsulfoxide; and then carrying out reaction with chlorosulfonic acid and neutralizing and dialyzing the product to obtain the alkali surfactant. According to the method provided by the invention, waste alkali lignin in industrial production is effectively utilized to facilitate the environmental protection, and meanwhile, the reaction conditions are mild without high temperature and high pressure conditions, and the reaction conditions are easy to control and adjust, so that the reaction process is simple, the production equipment is relatively simple, the product is low in cost, and the method has a very good industrial application prospect. The surface tension of the lignin surfactant prepared by the method reaches 29.17mN / m, thereby satisfying the active demands on industrial production and daily washing.

Description

technical field [0001] The invention relates to a method for preparing a surfactant by modifying alkali lignin, which belongs to the technical field of lignin utilization. technical background [0002] As a renewable resource with abundant reserves in nature, lignin is the most abundant natural aromatic polymer with its annual output second only to cellulose. At present, lignin mainly comes from chemical pulping, bioethanol processing, and organic solvent pulping. In industrial processing, lignin mainly provides heat in the form of combustion, and its use value is low. If the waste liquid rich in lignin is discharged, it will waste resources, and the cost of wastewater treatment is huge. Through molecular design and structural modification, the properties of lignin can be changed, and chemicals with high added value can be prepared to realize efficient utilization of lignin, which not only has important ecological benefits, but also has significant economic benefits. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00B01F17/50C09K23/50
Inventor 李明飞陈昌洲边静孙润仓
Owner BEIJING FORESTRY UNIVERSITY
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