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Method for separating hemicellulose in high yield pulp waste liquor and use of hemicellulose separated thereby

A hemicellulose, high-yield technology, which is applied to the separation of hemicellulose in high-yield pulping waste liquid and the application field of hemicellulose, can solve the problems of complex structure, limited application and the like, and achieves simple process, Low-cost, easy-to-handle effects

Inactive Publication Date: 2009-05-20
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The total amount of hemicellulose accounts for 1 / 4 to 1 / 3 of plant fibers. Although hemicellulose is widely distributed in plants, its complex structure limits their application in industry.

Method used

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  • Method for separating hemicellulose in high yield pulp waste liquor and use of hemicellulose separated thereby
  • Method for separating hemicellulose in high yield pulp waste liquor and use of hemicellulose separated thereby
  • Method for separating hemicellulose in high yield pulp waste liquor and use of hemicellulose separated thereby

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The pH value of the alkaline hydrogen peroxide mechanical pulp waste liquid (solid content is 2%) is adjusted to 3 with concentrated sulfuric acid with a concentration of 98%, and it is left to stand in a constant temperature water bath at 45°C for 30min, so that the lignin in the waste liquid Separate out, filter after lignin precipitation completely and obtain clear liquid, at room temperature with 6mol / L sodium hydroxide solution, the pH value of gained clear liquid is adjusted to 5, and add the dehydrated alcohol of 3 times of volume (to clear liquid), in Stand still at 55°C for 30 minutes to completely precipitate the hemicellulose, filter with suction, and obtain a hemicellulose filter cake, which becomes white powdery hemicellulose after being vacuum-dried at 55°C for 24 hours.

[0021] Cationic modification of hemicellulose: the hemicellulose separated in Example 1 is dispersed into a mixed solution of absolute ethanol and water (the volume ratio of ethanol:water...

Embodiment 2

[0031] The application method of the cationic hemicellulose is the same as that of Example 1, except that the quaternary ammonium salt cationic hemicellulose pulp internal strengthening agent is added to the softwood pulp.

[0032] According to the national paper and cardboard physical property test method, the strength indexes of softwood pulp paper sheets are measured, see Table 2.

[0033] Table 2

[0034]

[0035] It can be seen from Table 2 that the quaternary ammonium salt cationic hemicellulose can significantly enhance the strength of softwood pulp paper.

Embodiment 3

[0037] The application method of the cationic hemicellulose is the same as that in Example 1, except that a quaternary ammonium salt cationic hemicellulose pulp internal strengthening agent is added to the OCC waste paper pulp.

[0038] The strength indexes of OCC waste paper pulp sheets were measured according to the national paper and board physical property test method, see Table 3.

[0039] table 3

[0040]

[0041] It can be seen from Table 3 that the quaternary ammonium salt cationic hemicellulose can significantly enhance the strength of the OCC waste paper pulp sheet.

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Abstract

The invention discloses a method for separating hemicellulose from high-production-yield waste pulping and an application thereof. The method comprises the steps of regulating the pH value of the waste pulping to 3 by a concentrated sulfuric acid under room temperture, standing for 30min in a water bath under the constant temperature of 45 DEG C, depositing lignin and carrying out extraction and filtering, neutralizing a filtrate to reach a pH value of 5 by 6mol / L sodium hydroxide, depositing with alcohol with 3 times of volume, filtering, washing by the alcohol and drying in vacuume till constant weight so as to obtain the hemicellulose. To be taken as an internal intensifier, the hemicellulose obtained from separation is modified by quaternary ammonium salt cation. The quaternary ammonium salt cation hemicellulose is taken as the internal intensifier for broadleaf pulp, conifer pulp and waste OCC pulp and reaches good intensification effect. The method has the advantages of simple technology, easy operation and lower processing cost and can reach the purpose of 'changing waste into treasures'.

Description

technical field [0001] The invention relates to a method for separating hemicellulose in high-yield pulping waste liquid and the application of the hemicellulose. Background technique [0002] Hemicellulose is one of the main chemical components in plants. The total amount of hemicellulose accounts for 1 / 4-1 / 3 of plant fibers. Although hemicellulose is widely distributed in plants, its complex structure limits its industrial application. Since hemicellulose is an inexhaustible and inexhaustible renewable resource, in recent years, the application research results of hemicellulose at home and abroad are mostly used in biopharmaceutical and food industries, and are also used as papermaking materials. However, the hemicellulose used as a paper-making strengthening agent is directly extracted from plant materials. [0003] In pulping raw materials, the hemicellulose content in softwood fiber accounts for 10%-15% of the dry weight of the fiber cell wall, and the hemicellulose c...

Claims

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Application Information

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IPC IPC(8): C08B37/14D21H21/18
Inventor 胡惠仁张继颖
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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