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Production technology of cotton pulp for manufacturing cellulose nitrate

A cellulose nitrate ester and production process technology, applied in multi-stage pulping process, fiber raw material treatment, papermaking, etc., can solve the problems of cumbersome cooking process and bleaching process, difficult to treat highly polluted wastewater, and maximize product benefits, etc., to achieve The degree of polymerization is stable, the content of methyl fiber is high, and the strength is good.

Active Publication Date: 2020-01-07
山东银鹰股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing bleaching process of ordinary cotton pulp production, sodium hypochlorite and chlorine gas are used for multi-stage bleaching of cotton pulp, which causes damage to fibers and reduces fiber strength
And the COD of cooking black liquor is about 45000mg / L, there is a problem of highly polluted wastewater that is difficult to treat
[0005] Chinese patent, application number CN200810016759.3 discloses a title "a cotton pulp production method", in which cotton linters are used as raw materials to produce nitrated cotton pulp, but the cooking process and bleaching process are too cumbersome , which is not conducive to the control of the overall body and the maximization of product benefits

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In the embodiment of the present invention, a kind of cotton pulp production process for manufacturing cellulose nitrate, the process comprises the following steps:

[0037] (1) Material selection, cotton opening, and dry impurity removal: select 100% second-class cotton linters with a first-level maturity of 79-81%, use a cotton opener to tear the linters, and use an impurity remover to select After removing impurities, it is sent to screw press and impregnation through cyclone separator.

[0038] (2) Alkali preparation and impregnation: prepare lye at room temperature, control the temperature of lye at 15°C, the concentration of lye: 42g / L, the amount of lye: 17800L / ball, the ratio of lye (water to sodium hydroxide Proportion) 1:3.6, and then through the screw extrusion of the screw conveyor, the prepared lye and cotton linters are fully infiltrated and mixed. After the mixing is completed, they are transported to the cooking process by the screw conveyor.

[0039] (...

Embodiment 2

[0057] A kind of cotton pulp production process for manufacturing cellulose nitrate, the process comprises the following steps:

[0058] (1) Material selection, cotton opening, and dry impurity removal: select 100% second-class cotton linters with a first-level maturity of 79-81%, use a cotton opener to tear the linters, and use an impurity remover to select After removing impurities, it is sent to screw press and impregnation through cyclone separator.

[0059] (2) Alkali blending and impregnation: Alkali blending at room temperature, the temperature is controlled at 25°C, the concentration of alkali blending: 44g / L, the amount of alkali blending: 18000L / ball, the ratio of alkali liquid: 1:3.8, through screw extrusion, and cotton short The velvet is fully infiltrated and mixed, and conveyed to the cooking process by a screw.

[0060] (3) Injection aid: the aid is H 2 o 2 Specific additives, in the process of filling the ball with H 2 o 2 The standard H with the amount of...

Embodiment 3

[0075] A kind of cotton pulp production process for manufacturing cellulose nitrate, the process comprises the following steps:

[0076] (1) Material selection, cotton opening, and dry impurity removal: select 100% second-class cotton linters with a first-level maturity of 79-81%, use a cotton opener to tear the linters, and use an impurity remover to select After removing impurities, it is sent to screw press and impregnation through cyclone separator.

[0077] (2) Alkali blending and impregnation: Alkali blending at room temperature, the temperature is controlled at 35°C, the concentration of alkali blending: 46g / L, the amount of alkali blending: 18200L / ball, the ratio of alkali liquid: 1:4, through screw extrusion, and cotton short The velvet is fully infiltrated and mixed, and conveyed to the cooking process by a screw.

[0078] (3) Injection aid: the aid is H 2 o 2 Specific additives, in the process of filling the ball with H 2 o 2 The standard H with the amount of 5...

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Abstract

The invention discloses a production technology of a cotton pulp for preparing cellulose nitrate. The cotton pulp has the following indicators: the polymerization degree is 930-980, the whiteness is greater than or equal to 88%, the iron content is less than or equal to 15 ppm, the ash content is less than or equal to 0.08%, the fiber length is 23-32%, the alpha-cellulose content is greater than or equal to 97.5%, the water content is 6-9%, the content of small dusts is less than or equal to 15 mm<2> / 500 g, and the content of B-type dusts is less than or equal to 2 mm<2> / 500 g. The cotton pulpfor cellulose nitrate, prepared by the method, has the advantages of high fiber brooming degree, good strength, high alpha-cellulose content, stable polymerization degree and few dusts, and can be well applied to production of industries of novel medical fillers such as microcrystalline cellulose and explosive nitrocotton, high-grade nitrolacquers and architectural coatings.

Description

technical field [0001] The present invention relates to a production process of cotton pulp, in particular to a production process of cotton pulp for the manufacture of cellulose nitrate, which is used for the production of various colored celluloid, film, nitro lacquer flakes and explosives, and various spray paints. , typing stencil, varnish, bottle cover, etc., belonging to the technical field of cotton pulp. Background technique [0002] In recent years, in the domestic and foreign markets, explosives with strong explosive force and strong action have been manufactured and used as vasodilators in medicine. They are made into 0.3% nitroglycerin tablets and administered sublingually. The effect is rapid and short-lived, and the effect is extremely strong. . Therefore, the demand for nitrocellulose products is also increasing, which provides a favorable condition for the research and development of this variety of cotton pulp. [0003] my country is a big cotton producing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/26D21C7/00D21D1/02D21D1/30
CPCD21C3/26D21C7/00D21D1/02D21D1/30
Inventor 陈忠国曹知朋马伟良唐逢郑春友吕兴华李宗臻孙海龙
Owner 山东银鹰股份有限公司
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