Post-processing process of cotton-wood composite pulp

A composite pulp and wood pulp technology, applied in fiber raw material processing, pulp bleaching, natural cellulose pulp/paper, etc., can solve problems such as difficulty in large-scale production, discomfort, and poor product uniformity, and achieve easy implementation and use Convenience, the effect of overcoming poor uniformity

Inactive Publication Date: 2014-04-02
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 problems of poor uniformity of products produced by existing cotton linters, limited by the quality of cotton linters, difficulty in large-scale production and the fact that the existing bleaching process is not suitable for bleaching cotton and wood composite pulp, the present invention aims at cotton and wood composite pulp. According to the characteristics of the pulp itself, a post-treatment process for the production of viscose fiber pulp is proposed using the composite pulp of cotton linters and wood pulp as raw material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0048] In the selected cotton and wood composite pulp, cotton linters account for 99%, and wood pulp accounts for 1%.

[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 100g / m 3 , the amount of sodium hypochlorite used for bleaching is ...

Embodiment 2

[0066] Cotton linters and unbleached hardwood pulp as unbleached composite pulp

[0067] Among the selected cotton and wood composite pulp, cotton linters account for 85%, and wood pulp accounts for 15%.

[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 the bleaching time is 18 minutes. Add hypochlorite according to t...

Embodiment 3

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

[0086] In the selected cotton and wood composite pulp, cotton linters account for 80%, and wood pulp accounts for 20%.

[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 content is 80g / m 3 , the amount of sodium hypochlorite used for bleac...

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Abstract

The invention provides a post-processing process using composite pulp of cotton linters and wood pulp as raw materials to produce viscose pulp by aiming at characteristics of cotton-wood composite pulp. The post-processing process of the cotton-wood composite pulp includes the steps of chlorination, bleaching, washing and papermaking. In the post-processing process, the selected cotton linters accounts for 70-99% of the cotton-wood composite pulp while the wood pulp accounts for 1-30% of the cotton-wood composite pulp, and the composite pulp has the parameter indexes: alpha cellulose>=91%, degree of polymerization<=1200, ash content<=0.13, whiteness>=91%, viscosity<=13 and iron<=30ppm. The pulp feeding concentration in the post-processing process ranges from 3% to 5%, the pulp is acidized firstly in a pre-acidizing pool to enable a pH (potential of hydrogen) value to be regulated to 1-3 at the normal temperature, then the acidized pulp is fed to a chlorination tower, and the bleaching temperature ranges from 30 DEG C to 65 DEG C. Equipment and operation are simple in the whole process procedure, and the post-processing process is convenient to 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 the chlorination-bleaching-washing-papermaking post-processing technology of the composite pulp of cotton pulp and wood pulp 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. . [0003] With the development of my country's viscose fiber industry, domestic enterprises mostly use cotton pulp as the raw material for visc...

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 薛勤徐发祥刘爱兵陈昌明谢鹏蒲运龙杨大平王江
Owner YIBIN GRACE GROUP CO LTD
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