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Salix mongolica sulfate pulp bleaching process

A kraft pulp and kraft process technology, applied in pulp bleaching, textile and papermaking, fiber raw material processing and other directions, can solve the problems of poor bleaching performance, affecting the application of Salix kraft pulp, low strength performance indicators, etc. Impregnation penetration, avoid excessive cutting and disintegration, improve the effect of reactivity

Inactive Publication Date: 2011-09-14
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Salix kraft pulp has the disadvantages of poor bleaching performance and low strength performance index, which seriously affects the application of Salix kraft pulp in high-end products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] After the three-year-old Salix wood chips are cooked and washed by sulfuric acid method, the pulp performance is Kappa number 19.8, whiteness 29.8%ISO, and then bleached according to the following steps:

[0030] 1. Xylanase pretreatment, slurry concentration 10%, the enzyme used is xylanase AU-PE89, the pretreatment conditions are: temperature 48-50°C, time 60min, pH value 6.5-7, enzyme dosage 10IU / g dry pulp,

[0031] 2. The slurry pretreated in the above step 1 is washed, then bleached with chlorine dioxide, and the thickness of the slurry is 8%. With respect to the quality of the absolute dry pulp, the consumption and process conditions of chlorine dioxide are: ClO 2 0.8%, the initial pH value is 3-5, the temperature is 70-80°C, the time is 150 min, and the final pH value is 5-6;

[0032] 3. Carry out the second stage of enzyme treatment on the bleached pulp in step 2. The pulp concentration is 10%. The enzyme used is cellulase. The treatment conditions are: tempe...

Embodiment 2

[0036] After the three-year-old Salix wood chips are cooked and washed by sulfuric acid method, the pulp performance is 18.9 Kappa value and 30.3% ISO whiteness, and then bleached according to the following steps:

[0037] 1. Xylanase pretreatment, pulp concentration 10%, the enzyme used is xylanase AU-PE89, the pretreatment conditions are: temperature 48-50 ℃, time 60min, pH value 6.5-7, enzyme dosage 11IU / g dry pulp,

[0038] 2. The slurry pretreated in above-mentioned step 1 is washed, then bleached with chlorine dioxide, and the thickness of the slurry is 8%. With respect to the quality of the dry pulp, the consumption and process conditions of chlorine dioxide are: ClO 2 1.0%, the initial pH value is 3-5, the temperature is 70-80°C, the time is 150 min, and the final pH value is 5-6;

[0039] 3. The pulp bleached in step 2 is subjected to the second stage of enzyme treatment, the pulp concentration is 10%, the enzyme used is cellulase, the treatment conditions are: temp...

Embodiment 3

[0043] After three-year-old Salix wood chips are cooked and washed by sulfuric acid method, the pulp performance is Kappa number 20.2, whiteness 29.1%ISO, and then bleached according to the following steps:

[0044] 1. Xylanase pretreatment, the enzyme used is xylanase AU-PE89, the pulp concentration is 10%, the pretreatment conditions are: temperature 48-50°C, time 60min, pH value 6.5-7, enzyme dosage 12IU / g Dry pulp;

[0045] 2. The slurry pretreated in above-mentioned step 1 is washed, then bleached with chlorine dioxide, and the thickness of the slurry is 8%. With respect to the quality of the dry pulp, the consumption and process conditions of chlorine dioxide are: ClO 2 1.2%, the initial pH value is 3-5, the temperature is 70-80°C, the time is 150 min, and the final pH value is 5-6;

[0046] 3. The pulp bleached in step 2 is subjected to the second stage of enzyme treatment, the enzyme used is cellulase, the treatment conditions are: temperature 50-55°C, time 60min, pH...

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Abstract

The invention relates to a salix mongolica sulfate pulp bleaching process belonging to the technical field of a paper pulp bleaching process. The process comprises the following steps: boiling and washing pulp, and carrying out AU series xylanase pretreatment at 48-50 DEG C under the condition that the pH value is 6.5-7; washing, and carrying out chlorine dioxide bleaching; washing, and carrying out cellulase treatment at 50-55 DEG C under the condition that the pH value is 5.5-6.5; and washing, carrying out hydrogen peroxide bleaching, and washing to obtain high-whiteness high-strength salix mongolica bleaching sulfate pulp. Under the short-time bleaching process conditions, the invention improves the bleaching property of the paper pulp, increases the bleaching yield and strength property of the paper pulp, reduces the consumption of bleaching chemical agent, lessens the environmental pollution, improves the utility value of the fast growing shrub salix mongolica sulfate pulp, and widens the application range of the salix mongolica sulfate pulp, thereby solving the resource and environment problems hampering the development of the paper making industry in China.

Description

[0001] technical field [0002] The invention relates to the technical field of pulp bleaching technology, in particular to a biological enzyme-assisted bleaching technology of salix kraft pulp. Background technique [0003] There is a serious shortage of timber resources in my country, and the use of grass fibers to make pulp and paper accounts for a large proportion. Compared with wood pulp, straw pulp has poor drainage, high paper brittleness, easy transparency, and poor strength. Therefore, straw pulp can only be used to produce medium and low-grade paper. When producing medium and high-grade paper, it must be used with part of wood pulp or all of it. Wood pulp is used, and wood pulp mainly depends on imports. In order to solve the problems of resources and environment in the paper industry, my country's paper industry is gradually adjusting the structure of fiber raw materials to wood. On the one hand, through the implementation of forestry and paper integration proje...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C9/16D21C5/00
Inventor 杨桂花陈嘉川孔凡功刘玉
Owner QILU UNIV OF TECH
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