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Bleaching process of bamboo dissolving pulp

A technology of dissolving pulp and bamboo, which is applied in the direction of pulp bleaching, etc., can solve the problems of large waste water pollution load, increased investment cost and sewage discharge load, backward production equipment and technology of bamboo dissolving pulp, etc., and achieves less sewage discharge and low cost , the effect of stabilizing the degree of polymerization

Active Publication Date: 2012-08-22
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 recent years, an improved ECF bleaching process has been adopted in China, but it is still necessary to add an acid treatment section after bleaching to meet the quality requirements of dissolving pulp, which increases the investment cost and the load of sewage discharge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of bleaching technology of bamboo dissolving pulp, it comprises following processing steps successively:

[0038] A. Chlorine dioxide bleaching under strong acid conditions;

[0039] B. Hydrogen peroxide and oxygen enhanced alkali extraction;

[0040] C, chlorine dioxide bleaching.

[0041] Wherein, the process steps of chlorine dioxide bleaching under strong acid conditions in the step A are specifically:

[0042] A1, send the slurry with a weight concentration of 8% after washing and concentrating by the washing machine into the medium concentration standpipe, add sulfuric acid in the medium concentration standpipe, and adjust the pH value to 2.0;

[0043] A2. The slurry from the medium concentration standpipe is sent to the medium pressure steam heater through the medium concentration pump, and heated to 75°C with steam;

[0044] A3. The slurry coming out of the medium-pressure steam heater enters the medium-concentration mixer, and adds 6 kg / admt and a con...

Embodiment 2

[0060] A kind of bleaching technology of bamboo dissolving pulp, it comprises following processing steps successively:

[0061] A. Chlorine dioxide bleaching under strong acid conditions;

[0062] B. Hydrogen peroxide and oxygen enhanced alkali extraction;

[0063] C, chlorine dioxide bleaching.

[0064] Wherein, the process steps of chlorine dioxide bleaching under strong acid conditions in the step A are specifically:

[0065] A1, send the slurry with a weight concentration of 9% after washing and concentrating by the washing machine into the medium concentration standpipe, add sulfuric acid in the medium concentration standpipe, and adjust the pH value to 2.4;

[0066] A2. The slurry from the medium concentration standpipe is sent to the medium pressure steam heater through the medium concentration pump, and heated to 80°C with steam;

[0067] A3. The slurry coming out of the medium-pressure steam heater enters the medium-concentration mixer, and adds 7kg / admt chlorine dio...

Embodiment 3

[0083] A kind of bleaching technology of bamboo dissolving pulp, it comprises following processing steps successively:

[0084] A. Chlorine dioxide bleaching under strong acid conditions;

[0085] B. Hydrogen peroxide and oxygen enhanced alkali extraction;

[0086] C, chlorine dioxide bleaching.

[0087] Wherein, the process steps of chlorine dioxide bleaching under strong acid conditions in the step A are specifically:

[0088] A1. Send the slurry with a weight concentration of 11% after washing and concentration by the washing machine into the medium concentration standpipe, add sulfuric acid to the medium concentration standpipe, and adjust the pH value to 2.6;

[0089] A2. The slurry from the medium concentration standpipe is sent to the medium pressure steam heater through the medium concentration pump, and heated to 82°C with steam;

[0090] A3. The slurry coming out of the medium-pressure steam heater enters the medium-concentration mixer, and adds 8 kg / admt and a co...

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Abstract

The invention belongs to the field of dissolving pulp preparation technology, and particularly relates to a bleaching process of bamboo dissolving pulp. The bleaching process of bamboo dissolving pulp comprises the following sequential steps: A, bleaching with chlorine dioxide under a strong acid condition; B, performing reinforced alkaline extraction with hydrogen peroxide and oxygen; and C, bleaching with chlorine dioxide. The process provided by the invention is simple, does not need acid treatment after bleaching, requires low investment cost and realizes little sewage discharge.

Description

technical field [0001] The invention belongs to the technical field of preparation of dissolving pulp, and in particular relates to a 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 recent years, an improved ECF bleaching process has been adopted in China, but it is still...

Claims

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Application Information

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