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Improved bleaching process for bamboo wood dissolving pulp

A dissolving pulp and process technology, which is applied in the field of dissolving pulp preparation, can solve the problems of bamboo dissolving pulp production equipment and technology backward, poor protection of cellulose, and high consumption of bleaching chemicals, so as to save bleaching costs and stabilize card prices , Improve the effect of bleaching effect

Active Publication Date: 2012-07-18
CHONGQING LEE & MAN PAPER MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing bamboo dissolving pulp production equipment and technology are relatively backward, especially the traditional three-stage bleaching of C-E-H is mainly used in the bleaching process. The wastewater pollution load generated by the bleaching process is large, and there are internationally recognized carcinogens dioxin produce
[0004] In the improved ECF bleaching process, deep delignification cannot be achieved, the effect of protecting cellulose is poor, and the consumption of bleaching chemicals is high. After bleaching, an acid treatment section still needs to be added to meet the quality requirements of dissolving pulp. The process is complicated and the bleaching wastewater load relatively large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A kind of bleaching process of improved bamboo dissolving pulp, it comprises following processing steps successively:

[0048] A. Two-stage oxygen delignification;

[0049] B. Chlorine dioxide bleaching under strong acid conditions;

[0050] C, hydrogen peroxide and oxygen enhanced alkali extraction;

[0051] D. Chlorine dioxide bleaching.

[0052] Wherein, the process steps of adopting two stages of oxygen delignification in the step A are specifically:

[0053] A1. Add 2.0% caustic soda and 1kg / admt magnesium sulfate to the pulp with a weight concentration of 8% after washing and concentrating in the pulp washer, heat it to 90°C with low-pressure steam, and then pump it by medium-concentration Into the first medium-concentration mixer, add 20kg / admt oxygen into the first medium-concentration mixer and mix evenly, then enter the ascending / downflow reaction tube, the residence time of the slurry in the ascending / downflow reaction tube is 5min ;

[0054] A2. The slu...

Embodiment 2

[0074] A kind of bleaching process of improved bamboo dissolving pulp, it comprises following processing steps successively:

[0075] A. Two-stage oxygen delignification;

[0076] B. Chlorine dioxide bleaching under strong acid conditions;

[0077] C, hydrogen peroxide and oxygen enhanced alkali extraction;

[0078] D. Chlorine dioxide bleaching.

[0079] Wherein, the process steps of adopting two stages of oxygen delignification in the step A are specifically:

[0080] A1. Add caustic soda accounting for 2.4% of air-dried pulp weight and 2kg / admt magnesium sulfate to the slurry with a weight concentration of 10% after washing and concentrating in the pulp washer, heat it to 92°C with low-pressure steam, and then pump it with medium concentration Into the first section of medium-concentration mixer, add 22kg / admt oxygen into the first section of medium-concentration mixer and mix evenly before entering the ascending / downflowing flow reaction tube. The residence time of the ...

Embodiment 3

[0101] A kind of bleaching process of improved bamboo dissolving pulp, it comprises following processing steps successively:

[0102] A. Two-stage oxygen delignification;

[0103] B. Chlorine dioxide bleaching under strong acid conditions;

[0104] C, hydrogen peroxide and oxygen enhanced alkali extraction;

[0105] D. Chlorine dioxide bleaching.

[0106] Wherein, the process steps of adopting two stages of oxygen delignification in the step A are specifically:

[0107] A1. Add caustic soda accounting for 2.8% of air-dried pulp weight and 2kg / admt magnesium sulfate to the slurry with a weight concentration of 11% after being washed and concentrated by the pulp washer, and then heated to 94°C by low-pressure steam, and then pumped by medium-concentration Into the first section of medium-concentration mixer, add 24kg / admt oxygen into the first section of medium-concentration mixer and mix evenly before entering the ascending / downflowing flow reaction tube. The residence time ...

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Abstract

The invention belongs to the technical field of the preparation of dissolving pulp, in particular to an improved bleaching process for bamboo wood dissolving pulp. The improved bleaching process for bamboo wood dissolving pulp comprises the following process steps: A. dilignifying by two-section oxygen; B. bleaching by chlorine dioxide under the strong acid condition; C. carrying out reinforced alkaline extraction by hydrogen peroxide and oxygen; and D. bleaching by chlorine dioxide. According to the bleaching process, the dilignifying process can be deepened to better protect the cellulose, few chemicals for bleaching are consumed, acid processing sections do not need to be added after bleaching, and the bleaching process has the advantages of simple process and small load of bleaching waste water.

Description

technical field [0001] The invention belongs to the technical field of preparation of dissolving pulp, and in particular relates to an improved bleaching process of bamboo dissolving pulp. Background technique [0002] Dissolving pulp is widely used in textile viscose fiber, nitrocellulose, cellulose acetate and other cellulose derivative industries, and the market demand is gradually expanding. At present, the newly developed bamboo dissolving pulp has a broad market prospect and can fill the gap of dissolving pulp in my country. [0003] However, the existing bamboo dissolving pulp production equipment and technology are relatively backward, especially the traditional three-stage bleaching of C-E-H is mainly used in the bleaching process. The wastewater pollution load generated by the bleaching process is large, and there are internationally recognized carcinogens dioxin produce. [0004] In the improved ECF bleaching process, deep delignification cannot be achieved, the...

Claims

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Application Information

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IPC IPC(8): D21C9/147D21C9/14D21C9/16
Inventor 李文俊
Owner CHONGQING LEE & MAN PAPER MFG
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