Technique for preparing cotton pulp with high-degree of polymerization for cellulose ether

A technology with high degree of polymerization and production process, applied in fiber raw material processing, textiles and papermaking, etc., can solve the problems of reduced degree of polymerization, environmental pollution, obsolete equipment, etc., and achieve the effect of controlling fiber length and freeness

Active Publication Date: 2008-10-29
山东银鹰化纤有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, when domestic cotton pulp enterprises produce high-polymerization cotton pulp, most of them use traditional technology to strengthen caustic soda cooking conditions, do not add cooking aids, high-temperature bleaching, and strengthen bleaching strength; the equipment is outdated, and the product polymerization degree Low, whiteness less than 80%, and high dust, low added value, can only produce low-grade, low-viscosity cellulose ether products, which cannot meet the needs of the international market, and in the existing process, it is useless before cooking The special dry impurity removal equipment-the impurity remover selects and removes impurities for the cotton linters, and only uses the cotton opener to do simple impurity removal. The black liquor produced during the cooking process has a high COD content, and the COD emission content is about 45000mg/l. The problem of polluting the environment. Difficult to manage
[0004] Chinese patent, the application number is: "2006100684849", the title of the disclosure is "a kind of cotton pulp with high polyme

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Material selection, cotton opening, dry impurity removal: the raw materials are made of class II cotton linters, cotton seed hulls, synthetic fibers and other impurities are few, no special-shaped fibers, maturity 79%, ash 1.5%, sulfuric acid insoluble 76%, Use a cotton opener to tear the cotton linters, and use a trash remover to select and remove impurities, and then send them to the spiral press and impregnation through the cyclone separator;

[0045] (2) Alkali preparation and dipping: the temperature of alkali preparation is controlled at 60℃, the relative absolute dry pulp amount of total alkali is 9% based on NaOH, the ratio of alkali liquor is 1:4.1, and the relative absolute dry pulp amount of HY-PA penetrant is 0.2 %, the relative absolute dry pulp content of sodium silicate is 4.0%, which is extruded by screw, fully penetrated and mixed with cotton linters, and conveyed by screw to the cooking process;

[0046](3) Steaming, carried out in a digester, the firs...

Embodiment 2

[0073] (1) Material selection, cotton opening, dry impurity removal: the raw materials are made of class II cotton linters, cotton seed hulls, synthetic fibers and other impurities are few, no special-shaped fibers, maturity 79%, ash 1.5%, sulfuric acid insoluble 76%, Use a cotton opener to tear the cotton linters, and use a trash remover to select and remove impurities, and then send them to the spiral press and impregnation through the cyclone separator;

[0074] (2) Alkali preparation and dipping: The temperature of alkali preparation is controlled at 61℃, the relative absolute dry pulp amount of total alkali is 9.5% based on NaOH, the ratio of alkali liquor is 1:4.2, and the relative absolute dry pulp amount of HY-PA penetrant is 0.22. %, the relative absolute dry pulp volume of sodium silicate is 4.1%, which is extruded by screw, fully infiltrated and mixed with cotton linters, and conveyed by screw to the cooking process;

[0075] (3) Steaming, carried out in a digester, the...

Embodiment 3

[0102] (1) Material selection, cotton opening, dry impurity removal: the raw materials are made of class II cotton linters, cotton seed hulls, synthetic fibers and other impurities are few, no special-shaped fibers, maturity 79%, ash 1.5%, sulfuric acid insoluble 76%, Use a cotton opener to tear the cotton linters, and use a trash remover to select and remove impurities, and then send them to the spiral press and impregnation through the cyclone separator;

[0103] (2) Alkali preparation and dipping: the temperature of alkali preparation is controlled at 62℃, the relative absolute dry pulp amount of total alkali is 9.8% based on NaOH, the ratio of alkali solution is 1:4.3, and the relative absolute dry pulp amount of HY-PA penetrant is 0.25 %, the relative absolute dry pulp content of sodium silicate is 4.2%, which is extruded by screw, fully penetrated and mixed with cotton linters, and conveyed by screw to the cooking process;

[0104] (3) Steaming, carried out in a digester, th...

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Abstract

The invention relates to a process for producing cellulose ether used high polymerised cotton pulp, in particular to a cotton pulp production process mainly used for manufacturing high-viscosity cellulose ethers products, such as carboxymethyl cellulose, hydroxypropyl methylcellulose, etc. by utilizing cotton linters as the raw materials. The process adopts low temperature cooking to prevent carcinogenic toxic substances such as dioxins, organic halides, etc. from being produced through adding chlorine dioxide, thereby having low toxicity, reducing the pollution to the environment, and producing the cotton pulp with high polymerization degree, uniform fiber length, less dust and high alphacellulose content. Besides, the COD discharge amount of the waste water in the practical production is low, and belongs to the low pollutant emission.

Description

Technical field [0001] The invention relates to a cotton pulp production process, in particular to a production process for using cotton linters as raw materials to produce a high degree of polymerization cotton pulp for cellulose ethers, and is mainly used for the production of high-viscosity carboxymethyl cellulose , Hydroxypropyl methyl cellulose and other cellulose ether products cotton pulp production process. Background technique [0002] High degree of polymerization cotton pulp is made of high-grade cotton linters. It is mainly used to make cellulose ether products such as ultra-high viscosity carboxymethyl cellulose and hydroxypropyl methyl cellulose. It is an urgently needed commodity in the international market. With the development of the petroleum industry, especially offshore oil exploration, and the needs of the construction industry, especially in the production of food, medicine and other industries, the quality index requirements of cotton pulp are not only high...

Claims

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Application Information

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IPC IPC(8): D21C5/00
Inventor 李桂荣毕立强陈忠国周竹林曹知朋朱永德刘玉方杨友强臧贻朋
Owner 山东银鹰化纤有限公司
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