A post-treatment process of cotton wood bamboo composite pulp

A composite pulp and wood pulp technology, applied in fiber raw material processing, pulp bleaching, natural cellulose pulp/paper, etc., can solve the problems of poor product uniformity, discomfort, and difficulty in large-scale production, and achieve the goal of overcoming poor uniformity, Ease of use, targeted effects

Inactive Publication Date: 2014-10-22
YIBIN GRACE GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the poor uniformity of the products produced by the existing cotton linters, the limitation of the quality of the cotton linters, the difficulty in large-scale production and the fact that the existing bleaching process is not suitable for the bleaching of cotton, wood, and bamboo composite pulp, the present invention aims at cotton, wood, and bamboo composite pulp. Based on the characteristics of wood and bamboo composite pulp, a post-treatment process for the production of viscose pulp is proposed using cotton linters, wood pulp and bamboo pulp composite pulp as raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Cotton linters, unbleached hardwood pulp and unbleached bamboo pulp as unbleached composite pulp

[0048] Among the selected cotton, wood and bamboo composite pulps, cotton linters account for 30%, wood pulp accounts for 40%, and bamboo pulp accounts for 30%.

[0049] Composite pulp has the following parameters: methyl fiber ≥ 91%, polymerization degree ≤ 1200, ash content ≤ 0.13%, whiteness ≥ 91%, viscosity ≤ 13, iron content ≤ 30ppm.

[0050] The slurry concentration is controlled at 3% according to the weight percentage of the slurry. At room temperature, add hydrochloric acid to the pre-acid pool until the pH value is 3, and then enter the chlorination tower. The amount of chlorine gas is 0.6%, and the chlorination time is 0.5 hours. Pool, add caustic soda until the alkali content is the slurry volume ratio of 80g / m 3 ;

[0051] Enter the bleaching tank, heat up the steam to 65°C, stop the steam, add caustic soda to adjust the alkali, until the alkali content is 1...

Embodiment 2

[0066] Cotton linters, unbleached hardwood pulp and bleached bamboo pulp as unbleached composite pulp

[0067] Among the selected cotton, wood and bamboo composite pulps, cotton linters accounted for 1%, wood pulp accounted for 60%, and bamboo pulp accounted for 39%.

[0068] Composite pulp has the following parameters: methyl fiber ≥ 91%, polymerization degree ≤ 1200, ash content ≤ 0.13%, whiteness ≥ 91%, viscosity ≤ 13, iron content ≤ 30ppm.

[0069] The slurry concentration is controlled at 5% according to the weight percentage of the slurry. At room temperature, add hydrochloric acid to the pre-acid pool until the pH value is 3, and then enter the chlorination tower. Pool, add caustic soda until the alkali content is the slurry volume ratio 60g / m 3 ;

[0070] Enter the bleaching tank, heat up the steam to 3°C, stop the steam, add caustic soda to adjust the alkali, until the alkali content is 50g / m 3 , the amount of sodium hypochlorite used for bleaching is 0.7g / l, and t...

Embodiment 3

[0085] Cotton linters, bleached hardwood pulp and unbleached bamboo pulp as unbleached composite pulp

[0086] Among the selected cotton, wood and bamboo composite pulps, cotton linters account for 20%, wood pulp accounts for 30%, and bamboo pulp accounts for 50%.

[0087] Composite pulp has the following parameters: methyl fiber ≥ 91%, polymerization degree ≤ 1200, ash content ≤ 0.13%, whiteness ≥ 91%, viscosity ≤ 13, iron content ≤ 30ppm.

[0088] The concentration of the slurry is controlled at 3% according to the weight percentage of the slurry. At room temperature, add hydrochloric acid to the pre-acid tank until the pH value is 2, enter the chlorination tower, use 0.5% chlorine gas, and enter the alkalization after 1.5 hours of chlorination time. Pool, add caustic soda until the alkali content is the slurry volume ratio of 80g / m 3 ;

[0089] Enter the bleaching pool, heat up the steam to 30°C, stop the steam, add caustic soda to adjust the alkali, until the alkali cont...

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Abstract

Aiming at the self characteristics of wool, wood and bamboo compound pulp, the invention provides a posttreatment process which is used for manufacturing viscose fibre pulp from compound pulp of cotton linter, wood pulp and bamboo pulp used as a raw material. The posttreatment process comprises the process steps of: chlorination, bleaching, washing and manufacturing. The cotton linter, the wood pulp and the bamboo pulp selected by the posttreatment process provided by the invention can be compounded according to any proportion; and the compound pulp has the following parameter indexes that methyl fibre is greater than or equal to 91%, the polymerization degree is less than or equal to 1200, the ash is less than or equal to 0.13%, the whiteness is greater than or equal to 91%, the viscosity is less than or equal to 13, and the iron matter is less than or equal to 30 ppm. The pulp inlet concentration of the treating process provided by the invention is 3%-5%, the pulp is subjected to acid treatment in a pre-acid pool to adjust the pH value to 1-3 at room temperature, the pulp is then fed into a chlorination tower, and the bleaching temperature is 30-65 DEG C. The whole technological process is simple in equipment and operation, convenient for use, high in production efficiency and stable in product quality.

Description

technical field [0001] The invention belongs to the post-treatment process link in the production process of denaturing composite pulp into viscose fiber pulp, and is especially suitable for chlorination-bleaching-washing-making of composite pulp of cotton pulp, wood pulp and bamboo pulp post-processing technology field. Background technique [0002] Viscose fiber is a kind of commonly used chemical fiber, and its production process is as follows: pulping→preparation of spinning solution→spinning→post-processing→finished product, among which viscose pulp is obtained through pulping. Traditional viscose pulp is prepared from wood and cotton linters through a series of processes such as material selection, material preparation, physical processing or chemical pretreatment, cooking, bleaching, acid treatment, washing and papermaking. . In recent years, there is also a production method of carrying out the above-mentioned series of operations on raw materials such as bamboo an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H11/00D21C9/10D21C9/12D21F11/00
Inventor 薛勤于渭东刘爱兵陈昌明谢鹏黄俊杨大平王江
Owner YIBIN GRACE GROUP CO LTD
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