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A kind of extraction and quaternization modification method of hemicellulose in viscose fiber production waste liquid

A quaternized ammonium modification and hemicellulose technology, applied in the chemical industry, can solve the problems of difficult processing and serious pollution, and achieve the effects of low processing cost, good social benefits, and maintaining biodegradability

Inactive Publication Date: 2016-01-20
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the production of viscose fiber, a large amount of waste liquid containing hemicellulose is produced, which has high utilization value. However, because the waste liquid contains a large amount of alkali at the same time, the processing is difficult and the pollution is serious. Its treatment is a problem in the viscose fiber industry today. technical challenge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The viscose fiber production waste liquid with a hemicellulose content of 45g / L and an alkali content of 206g / L is pretreated by a filter, and the filtration area is 0.8m 3 The membrane separation device has an operating temperature of 50°C, an inlet pressure of 6bar, and an outlet pressure of 4bar. Add 4 times the volume of water, continue diafiltration, to obtain alkali-containing hemicellulose concentrate, the final hemicellulose content in the concentrate reaches 112.7g / L, and the alkali content in the concentrate reaches 3.4g / L. In the obtained alkali-containing hemicellulose, the alkali content is 3% of the mass percentage of the hemicellulose.

[0024] Taking the alkali-containing hemicellulose extracted from the waste liquid of viscose fiber production as the raw material, adding 2,3-epoxypropyltrimethylammonium chloride, alkali-containing hemicellulose and 2,3-epoxypropyltrimonium chloride The molar ratio of methyl ammonium chloride is 1:1, stir, heat up to 60℃, r...

Embodiment 2

[0027] The viscose fiber production waste liquid with a hemicellulose content of 45g / L and an alkali content of 206g / L is pretreated by a filter, and the filtering area is 0.8m 3 The membrane separation device has an operating temperature of 50°C, an inlet pressure of 6bar, and an outlet pressure of 4bar. Add 3.5 times the volume of water, continuous diafiltration, to obtain alkali-containing hemicellulose concentrate, the final hemicellulose content in the concentrate reaches 102.9g / L, and the alkali content in the concentrate reaches 5.2g / L. In the obtained alkali-containing hemicellulose, the alkali content is 5% of the mass percentage of the hemicellulose.

[0028] Taking the alkali-containing hemicellulose extracted from the waste liquid of viscose fiber production as the raw material, adding 2,3-epoxypropyltrimethylammonium chloride, alkali-containing hemicellulose and 2,3-epoxypropyltrimonium chloride The molar ratio of methyl ammonium chloride is 1:1, stir, warm up to 80°...

Embodiment 3

[0031] The viscose fiber production waste liquid with a hemicellulose content of 45g / L and an alkali content of 206g / L is pretreated by a filter, and the filtration area is 0.8m 3 The membrane separation device has an operating temperature of 50°C, an inlet pressure of 6bar, and an outlet pressure of 4bar. Add 3.5 times the volume of water, continuous diafiltration, to obtain alkali-containing hemicellulose concentrate, the final hemicellulose content in the concentrate reaches 102.9g / L, and the alkali content in the concentrate reaches 5.2g / L. In the obtained alkali-containing hemicellulose, the alkali content is 5% of the mass percentage of the hemicellulose.

[0032] Taking the alkali-containing hemicellulose extracted from the waste liquid of viscose fiber production as the raw material, adding 2,3-epoxypropyltrimethylammonium chloride, alkali-containing hemicellulose and 2,3-epoxypropyltrimonium chloride The molar ratio of methyl ammonium chloride is 1:2, stir, warm up to 70...

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Abstract

The invention relates to an extraction method and a quaternarization modification method for semi-cellulose in waste viscose fiber production liquor. The extraction method comprises the step of: performing separation and extraction to semi-cellulose and alkali liquor in the waste viscose fiber production liquor through membrane separation, wherein concentrated liquor is alkaliferous semi-cellulose; the modification method comprises the step of: directly etherifying raw material which is alkaliferous semi-cellulose extracted from the waste viscose fiber production liquor in the presence of 2,3-epoxypropyltrimethylammonium chloride serving as an etherifying agent to obtain quaternarized semi-cellulose. According to the extraction method and the quaternarization modification method, the semi-cellulose and alkali liquor in the waste viscose fiber production liquor can be effectively utilized, the addition of catalyst in the modification technology can be simplified, the operation is easy, the production cost is low, the hydrophilicity of the modified semi-cellulose is greatly improved, the application performance is good, and the waste liquor pollution and the semi-cellulose plant resource reutilization problems can be reasonably solved.

Description

Technical field [0001] The invention belongs to the technical field of chemical industry, and specifically relates to a method for extracting and quaternizing hemicellulose in the waste liquid of viscose fiber production. Background technique [0002] Hemicellulose is an inexhaustible renewable plant resource. After entering the 21st century, with the rapid reduction of the world’s forest area and the increase in wood prices, hemicellulose, as a biodegradable natural polymer material, has been included in the national key scientific and technological research plan as a new industrial product and has become a An important research direction of renewable resources in green chemical industry. [0003] Hemicellulose has a complex chemical structure and molecular structure, such as branched, amorphous, different types of monosaccharides and different types of functional groups, such as hydroxyl, acetyl, carboxyl, methoxy, etc. These different types of polysaccharides It exhibits diffe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B37/14
Inventor 张林雅于捍江冯薇
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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