Preparation method of cotton pulp and preparation method of viscose fiber

A technology of viscose fiber and cotton pulp, which is applied in the direction of cellulose raw material pulping, fiber raw material treatment, pulping with inorganic alkali, etc., and can solve the problem of low cellulose content

Active Publication Date: 2017-01-04
ANHUI SNOW DRAGON FIBER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current alkaline cooking process is to cook at a high temperature of 160-170°C by adding alkali, but the obtained cotton pulp has a cellulose content of about 93% and a whiteness of only about 78-81%. , the quality of cotton pulp for viscose fiber needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] The invention provides a kind of preparation method of cotton pulp, comprises the following steps:

[0026] The cotton linters are sequentially subjected to dry impurity removal and wet impurity removal to obtain impurity-removed cotton linters;

[0027] Mix the impurity-removed cotton linters with the cooking liquid, heat up to 85-95°C, and keep warm for 50-70 minutes; continue to heat up to 110-125°C, and keep warm for 120-300 minutes to obtain the cooked slurry; the cooking liquid includes alkali and hydrogen peroxide;

[0028] The cooked pulp is sequentially subjected to beating, desanding, chloralkaliization, bleaching, acid treatment and papermaking to obtain cotton pulp.

[0029] In the present invention, the cotton linters are sequentially subjected to dry impurity removal and wet impurity removal, and then the impurity-removed cotton linters are cooked. In the present invention, the cotton linters are preferably sequentially passed through a cotton opener, a s...

Embodiment 1

[0058] 3.2 tons of cotton linters are successively passed through the cotton opener and the secondary opener to velvet and break the cotton linters, and then pass through the dry-type impurity removal unit for impurity removal; The short fluff is put into the hydraulic pulper for pulping and dispersion, the desander is used for desanding operation, and the thickener is used to concentrate to a concentration of 40%.

[0059] The temperature of alkali preparation is controlled at less than 25°C, the amount of alkali used is 20%, the bath ratio is 1:4.0, the amount of penetrant JFC is 0.4%, and the amount of hydrogen peroxide is 8%. Send into steamed balls.

[0060] For the first cooking, the temperature is raised for 40 minutes, the temperature is raised to 85°C, and the temperature is kept for 60 minutes, and then the temperature is raised for the second time for 40 minutes, the temperature is 125°C, and the temperature is kept for 300 minutes to complete the cooking.

[0061]...

Embodiment 2

[0067] 3.3 tons of cotton linters are successively passed through the cotton opener and the second cotton opener to velvet and break the cotton linters, and then pass through the dry-type impurity removal unit for impurity removal; The short fluff is put into the hydraulic pulper for pulping and dispersion, the desander is used for desanding operation, and the thickener is used to concentrate to a concentration of 45%.

[0068] The temperature of alkali preparation is controlled at less than 25°C, the amount of alkali used is 21%, the bath ratio is 1:4.0, the amount of penetrant JFC is 0.4%, and the amount of hydrogen peroxide is 9%. Send into steamed balls.

[0069] The first time of cooking is to heat up for 40 minutes, the temperature is raised to 90°C, and the temperature is kept for 50 minutes, and then the temperature is raised for the second time for 40 minutes, the temperature is 120°C, and the temperature is kept for 250 minutes to complete the cooking.

[0070] Wash...

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Abstract

The invention provides a preparation method of cotton pulp. The preparation method comprises the following steps: sequentially performing dry impurity removal and wet impurity removal on cotton linter to obtain impurity-removed cotton linter; mixing the impurity-removed cotton linter with cooking liquor, heating to 85-95 DEG C, and preserving heat for 50-70 min; continually heating to 110-125 DEG C, and preserving heat for 120-300 min to obtain a cooked slurry; sequentially pulping, desanding, chlorinating and alkalizing, bleaching, performing acid treatment and a papermaking process on the cooked slurry to obtain the cotton pulp, wherein the cooking liquor comprises alkali and hydrogen peroxide. By the preparation method, hydrogen peroxide is added in the cooking process, and cooking is carried out by two stages at low temperature, so that a role of hydrogen peroxide in destroying colored groups of cotton fiber is fully played, the initial whiteness of the cooked slurry is improved, and the alpha cellulose content of the cotton pulp is increased; meanwhile, by the preparation method, the quality of the cotton pulp is greatly improved, and paper pulp pollution of the cotton pulp is reduced. The invention further provides a preparation method of viscose fiber.

Description

technical field [0001] The invention belongs to the technical field of cotton pulp, and in particular relates to a preparation method of cotton pulp and a preparation method of viscose fiber. Background technique [0002] Cotton pulp is an important raw material for the production of chemical products such as pulp and viscose fiber. Among them, the degree of polymerization of cotton pulp used in the production of viscose fiber is required to be kept in a low range, between 400 and 800, and it needs to have a high A cellulose content and higher whiteness. [0003] At present, the production process of cotton pulp for viscose fiber is mainly through alkaline cooking, and then papermaking after beating, sand removal, chloralkaliization and bleaching to obtain cotton pulp for viscose fiber. However, the current alkaline cooking process is to cook at a high temperature of 160-170°C by adding alkali, but the obtained cotton pulp has a cellulose content of about 93% and a whitenes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21C3/22D21H11/12D01F2/06
CPCD01F2/06D21C3/02D21C3/222D21H11/12
Inventor 陶振家常寿吴保杰尚韧
Owner ANHUI SNOW DRAGON FIBER TECH
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