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Carboxymethylation modification method and applications of semi-cellulose in waste liquor from viscose fiber production

A technology of hemicellulose and viscose fiber, which is used in fiber raw material treatment, coating, paper coating and other directions to achieve the effect of good dispersion performance, easy operation, good adsorption and water solubility

Inactive Publication Date: 2014-03-05
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 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 glycans Exhibits different chemical behaviors, making its applications extremely limited

Method used

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  • Carboxymethylation modification method and applications of semi-cellulose in waste liquor from viscose fiber production
  • Carboxymethylation modification method and applications of semi-cellulose in waste liquor from viscose fiber production
  • Carboxymethylation modification method and applications of semi-cellulose in waste liquor from viscose fiber production

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Experimental program
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Effect test

Embodiment 1

[0026] Use the alkali-containing hemicellulose extracted from viscose fiber production waste liquid as raw material, add monochloroacetic acid, react at 70°C for 120 minutes, cool, let stand, the supernatant is washed with 90% ethanol, precipitated, and the crude product is obtained by suction filtration ; The crude product was dissolved in water and centrifuged; the supernatant was washed with 90% ethanol, precipitated, filtered, and vacuum-dried for 24 hours to obtain carboxymethyl hemicellulose products.

[0027] The raw material is alkali-containing hemicellulose extracted from viscose production waste liquid, wherein the alkali content is 10% of the hemicellulose mass percentage;

[0028] The etherifying agent is monochloroacetic acid;

[0029] The molar ratio of the material containing alkali hemicellulose and monochloroacetic acid is 1:1.5;

[0030] The carboxymethyl hemicellulose has a degree of substitution of 0.47.

[0031] The carboxymethyl hemicellulose dispersan...

Embodiment 2

[0036] Use alkali-containing hemicellulose extracted from viscose fiber production waste liquid as raw material, add monochloroacetic acid, react at 80°C for 150 minutes, cool, let stand, wash the supernatant with 90% ethanol, precipitate, and suction filter to obtain the crude product ; The crude product was dissolved in water and centrifuged; the supernatant was washed with 90% ethanol, precipitated, filtered, and vacuum-dried for 24 hours to obtain carboxymethyl hemicellulose products.

[0037] The raw material is alkali-containing hemicellulose extracted from viscose production waste liquid, wherein the alkali content is 15% of the hemicellulose mass percentage;

[0038] The etherifying agent is monochloroacetic acid;

[0039] The molar ratio of the material containing alkali hemicellulose and monochloroacetic acid is 1:2;

[0040] The carboxymethyl hemicellulose has a degree of substitution of 0.68.

[0041] The carboxymethyl hemicellulose dispersant obtained in the pre...

Embodiment 3

[0046] Use alkali-containing hemicellulose extracted from viscose fiber production waste liquid as raw material, add monochloroacetic acid, react at 80°C for 150 minutes, cool, let stand, the supernatant is washed with 90% ethanol, precipitated, and the crude product is obtained by suction filtration ; The crude product was dissolved in water and centrifuged; the supernatant was washed with 90% ethanol, precipitated, filtered, and vacuum-dried for 24 hours to obtain carboxymethyl hemicellulose products.

[0047] The raw material is alkali-containing hemicellulose extracted from viscose production waste liquid, wherein the alkali content is 20% of the hemicellulose mass percentage;

[0048] The etherifying agent is monochloroacetic acid;

[0049] The molar ratio of the material containing alkali hemicellulose and monochloroacetic acid is 1:2.5;

[0050] The carboxymethyl hemicellulose has a degree of substitution of 0.91.

[0051] The carboxymethyl hemicellulose dispersant ob...

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Abstract

The invention relates to a carboxymethylation modification method and applications of semi-cellulose in waste liquor from viscose fiber production. The modification method comprises the steps of: adding monochloroacetic acid in a raw material which is alkaliferous semi-cellulose extracted from the waste liquor from viscose fiber production, reacting for 120-180min at 70-90DEG C, cooling, standing, washing supernated liquor with 90% ethanol, precipitating, and performing suction filtration to obtain a crude product; dissolving the crude product into water, and performing centrifugal separation; washing supernated liquor with 90% ethanol, precipitating, filtering, performing vacuum drying for 24h to obtain a carboxymethyl semi-cellulose product. After being applied to dispersing agents of coating, printing and dyeing, industrial water treatment and the like, the modified carboxymethyl semi-cellulose product has good adsorportion property, is low in usage amount and good in dispersity. The alkaliferous semi-cellulose extracted from the waste viscose fiber production liquor is subjected to carboxymethylation modification, the carboxymethylation modification method is simple in technology, easy to operate and low in production cost, 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 in particular relates to a hemicellulose carboxymethylation modification method and application in viscose fiber production waste liquid. Background technique [0002] Hemicellulose is an inexhaustible renewable plant resource. After entering the 21st century, with the sharp reduction of the world's forest area and the increase of wood prices, hemicellulose, as a degradable natural polymer material, has been included in the national key scientific and technological research plan as a new industrial product development, and has become a sustainable An important research direction of renewable resources in green chemical industry. [0003] In the production of viscose fiber, a large amount of waste liquid containing hemicellulose is produced, which has high utilization value, but because the waste liquid contains a large amount of alkali at the same time, the processing is difficult,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/14C09D7/12D21H19/00
Inventor 张林雅于捍江葛艳蕊赵秀媛
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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