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Method for bioenzyme-assisted chlorine dioxide bleaching of bagasse pulp

A technology of chlorine dioxide and bagasse pulp, applied in pulp bleaching, etc., can solve the problems of extra input costs and unsatisfactory input-output ratio, and achieve the effects of saving usage, reducing pollution, and reducing content

Active Publication Date: 2014-12-10
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, there have been many methods at home and abroad to try to reduce the amount of chlorine dioxide used in the bleaching process by reducing hemicellulose and hexenuronic acid in pulp, thereby reducing AOX emissions in wastewater, such as dilute acid leaching before bleaching, and high-temperature carbon dioxide Chlorine bleaching, etc., can achieve the purpose of reducing the AOX content in wastewater, but these methods have increased more additional input costs, and the input-output ratio is far from satisfactory. Find a way to increase the input as much as possible. Output ratio, improving the universal applicability in the factory has become an urgent problem to be solved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Bioenzyme-assisted chlorine dioxide bleaching method for bagasse pulp;

[0021] 1. Hemicellulose biological enzyme pretreatment:

[0022] The washed and screened unbleached bagasse slurry is first sent to the pretreatment bleaching tower for biological enzyme pretreatment to obtain the bagasse slurry after biological enzyme pretreatment. The process conditions for hemicellulose biological enzyme pretreatment are: bleaching temperature 65°C , enzyme dosage 20IU / g 浆 , The reaction time is 100min.

[0023] 2. Ligninase pretreatment:

[0024] After washing the bagasse slurry after the hemicellulase pretreatment in step 1, adjust the weight concentration of the bagasse slurry to 11%, control the reaction pH to 6-9, and then enter the ligninase pretreatment tower for reaction, lignin The technological conditions of enzyme pretreatment are: bleaching temperature 50°C, enzyme dosage 20IU / g 浆 , The reaction time is 120min. During the reaction process, the temperature and pH...

Embodiment 2

[0029] Bioenzyme-assisted chlorine dioxide bleaching method for bagasse pulp:

[0030] 1. Hemicellulose biological enzyme pretreatment:

[0031] The washed and screened unbleached bagasse slurry is first sent to the pretreatment bleaching tower for biological enzyme pretreatment to obtain the bagasse slurry after biological enzyme pretreatment. The process conditions for hemicellulose biological enzyme pretreatment are: bleaching temperature 65°C , enzyme dosage 40IU / g 浆 , The reaction time is 100min.

[0032] 2. Ligninase pretreatment:

[0033] After washing the bagasse slurry after the hemicellulase pretreatment in step 1, adjust the weight concentration of the bagasse slurry to 11%, control the reaction pH to 6-9, and then enter the ligninase pretreatment tower for reaction, lignin The process conditions of enzyme pretreatment are: bleaching temperature 50°C, enzyme dosage 40IU / g 浆 , The reaction time is 120min. During the reaction process, the temperature and pH of th...

Embodiment 3

[0038] Bioenzyme-assisted chlorine dioxide bleaching method for bagasse pulp:

[0039] 1. Hemicellulose biological enzyme pretreatment:

[0040] The washed and screened unbleached bagasse slurry is first sent to the pretreatment bleaching tower for biological enzyme pretreatment to obtain the bagasse slurry after biological enzyme pretreatment. The process conditions for hemicellulose biological enzyme pretreatment are: bleaching temperature 65°C , enzyme dosage 50IU / g 浆 , The reaction time is 100min.

[0041] 2. Ligninase pretreatment:

[0042] After washing the bagasse slurry after the hemicellulase pretreatment in step 1, adjust the weight concentration of the bagasse slurry to 11%, control the reaction pH to 6-9, and then enter the ligninase pretreatment tower for reaction, lignin The process conditions of enzyme pretreatment are: bleaching temperature 50°C, enzyme dosage 50IU / g 浆 , The reaction time is 120min. During the reaction process, the temperature and pH of th...

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Abstract

The invention relates to a method for bioenzyme-assisted chlorine dioxide bleaching of bagasse pulp. The method comprises the following steps: (1) performing hemicellulase pretreatment; (2) performing ligninase pretreatment; (3) performing chlorine dioxide bleaching. According to the method, hexenuronic acid and hemicellulose in unbleached bagasse pulp are removed through the hemicellulase pretreatment of the unbleached bagasse pulp, so that more residual lignin is exposed; lignin exposed on the fiber surface is removed by using ligninase, so that less chlorine dioxide is used in a chlorine dioxide bleaching section and AOX (adsorbable organic halogen) generated in the bleaching process is reduced; after the bagasse pulp is subjected to bioenzyme pretreatment, the consumption of chlorine dioxide is saved by 30%-50% and the forming amount of AOX is reduced by 40%-60%.

Description

technical field [0001] The invention relates to a method for pulp bleaching and clean production in pulp and papermaking enterprises, in particular to a method for bleaching bagasse pulp assisted by biological enzymes with chlorine dioxide. Background technique [0002] China is a major producer and consumer of paper and cardboard in the world, ranking first in the world in total production and consumption. China is also the largest developing country in the world with a large population. With the development of the national economic situation, people's material and cultural life is increasingly enriched and improved, and the demand for paper and cardboard is very strong. Such a large increase in demand provides a very rare development opportunity for the paper industry, followed by fierce market competition. In recent years, the competition among pulp and paper companies around the world has become more and more fierce. Energy saving, cost reduction, and production efficie...

Claims

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Application Information

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IPC IPC(8): D21C9/14
Inventor 聂双喜王双飞姚双全宋雪萍覃程容
Owner GUANGXI UNIV
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