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Production process of cotton pulp for spinning-grade cellulose diacetate

A technology of cellulose diacetate and production process, which is applied in the direction of pulping of cellulose raw materials, post-processing of cellulose pulp, pulping with inorganic alkali, etc. requirements, the monopoly of the tobacco filter raw material market, and restrictions on the development of regenerated cellulose, to achieve the effects of stable polymerization degree, fast speed and high methyl fiber content

Active Publication Date: 2020-11-03
山东银鹰股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although my country's tobacco market is huge, the quality of cellulose diacetate tobacco filter materials has high requirements on the methylene chloride extract and reactivity of cotton fibers. At present, the performance of domestic cotton pulp products cannot meet the production requirements of tobacco filters, resulting in The tobacco filter raw material market is monopolized by foreign companies, which limits the development of my country's regenerated cellulose industry
[0005] The patent No. CN201910956956.1 discloses a production process of cotton pulp for quantitative and qualitative filter paper. In this production process, cotton linters are used as raw materials to produce cotton pulp for quantitative and qualitative filter paper. Although the degree of polymerization meets Tobacco tow cotton pulp requirements, but because of the addition of hydrogen peroxide in the cooking process, and the beating is too severe, it cannot meet the requirements of tobacco tow grade cotton pulp for rapid esterification reaction

Method used

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  • Production process of cotton pulp for spinning-grade cellulose diacetate
  • Production process of cotton pulp for spinning-grade cellulose diacetate

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Effect test

Embodiment 1

[0032] Embodiment 1: a kind of production technology of cotton pulp for spinning grade cellulose diacetate, specifically comprises the following steps:

[0033] 1) Material selection, cotton opening, and dry impurity removal: select 100% cotton linters with a maturity of 72% of the third category, and use a cotton opener to open the cotton linters. The opening thickness of the cotton linters is required to be ≤ 10cm, and put it into the cotton opener, the time of putting it into the cotton opener is ≥ 60min, and then send the cotton linters to the cleaning machine for selection and cleaning. The cotton linters of the miscellaneous machine are output in sequence, and sent to the screw through the cyclone separator for pressing.

[0034] 2) Alkali blending and impregnation: At a temperature of 60°C, the ratio of sodium hydroxide and water is 1:4.2. The concentration after alkali blending is required to be 45±2g / L. Before measuring the concentration of the alkali solution, it is ...

Embodiment 2

[0048] Embodiment 2: a kind of production technology of cotton pulp for spinning grade cellulose diacetate, specifically comprises the following steps:

[0049] 1) Material selection, cotton opening, and dry impurity removal: select 100% cotton linters with a maturity of 73% of the third category, and use an opener to open the cotton linters. The opening thickness of the cotton linters is required to be ≤ 10cm, and put it into the cotton opener, the time of putting it into the cotton opener is ≥ 60min, and then send the cotton linters to the cleaning machine for selection and cleaning. The cotton linters of the miscellaneous machine are output in sequence, and sent to the screw through the cyclone separator for pressing.

[0050] 2) Alkali blending and impregnation: At a temperature of 70°C, the ratio of sodium hydroxide and water is 1:4.4. The concentration after alkali blending is required to be 45±2g / L. Before measuring the concentration of the alkali solution, it is necess...

Embodiment 3

[0064] Embodiment 3: a kind of production technology of cotton pulp for spinning grade cellulose diacetate, specifically comprises the following steps:

[0065] 1) Material selection, cotton opening, and dry impurity removal: select 100% cotton linters with a maturity of 75% of the third category, and use a cotton opener to open the cotton linters. The opening thickness of the cotton linters is required to be ≤ 10cm, and put it into the cotton opener, the time of putting it into the cotton opener is ≥ 60min, and then send the cotton linters to the cleaning machine for selection and cleaning. The cotton linters of the miscellaneous machine are output in sequence, and sent to the screw through the cyclone separator for pressing.

[0066] 2) Alkali blending and impregnation: At a temperature of 60-80°C, the ratio of sodium hydroxide and water is 1:4.7. The concentration after alkali blending is required to be 45±2g / L. Before measuring the concentration of the alkali solution, it ...

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Abstract

The invention discloses cotton pulp for spinning-grade cellulose diacetate. A production process of the cotton pulp specifically comprises the following steps: (1) selecting materials, opening cotton,and removing impurities by a dry method, (2) preparing alkali, dipping the cotton, (3) injecting an additive, (4) cooking the cotton, (5) washing the cotton and feeding pulp, (6) carrying out pre-desanding, (7) carrying out pre-pulping, (8) bleaching the cotton, (9) carrying out post-desanding, (10) carrying out post-pulping and (11) carrying out papermaking. According to the invention, an auxiliary agent is added in a cooking section and three large-taper pulping is adopted, so that high alpha-cellulose content and stable polymerization degree of the cotton pulp finished product can be ensured, the length of the cotton pulp is controlled, and the production of tobacco tow-grade cellulose diacetate can be met.

Description

technical field [0001] The invention relates to a production process of cotton pulp, in particular to a process for producing cotton pulp for spinning-grade cellulose diacetate by using cotton linters as raw materials, which belongs to the production process of spinning-grade cotton pulp . Background technique [0002] Diacetate tow is used as cigarette filter material, which has good elasticity, non-toxicity, tasteless, good thermal stability, small suction resistance, remarkable interception effect, can selectively absorb harmful components in cigarettes, and at the same time retains a certain amount of smoke. Alkaline without losing the taste of cigarettes. [0003] At present, the annual demand for diacetate tow in the domestic tobacco industry is about 200,000 tons, and the market size has reached more than 2.5 billion yuan. The huge domestic tobacco market and enterprises reduce production costs, reduce various risks brought about by relying on imported raw materials...

Claims

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Application Information

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IPC IPC(8): D21H11/12D21C3/22D21C3/02D21C7/00D21D1/02D21C9/16
CPCD21H11/12D21C3/222D21C3/02D21C7/00D21D1/02D21C9/163Y02W30/64
Inventor 陈忠国曹知朋马伟良唐逢郑春友吕兴华李宗臻孙海龙刘宝强
Owner 山东银鹰股份有限公司
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