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Process for biologically pulping

A technology for biological pulping and pulping, applied in the field of papermaking, can solve the problems of large waste liquid environmental pollution load, fiber damage, and complicated impurity removal system, so as to reduce the waste liquid environmental pollution load, enhance the dust removal ability, and save energy. The effect of removing the clutter system

Inactive Publication Date: 2005-05-18
CHINA BANKNOTE PRINTING & MINTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The former has high pollution, low yield, and serious fiber damage; the latter has high requirements for raw materials and insufficient ability to remove dust. When the cotton fiber raw material contains a lot of impurities, problems such as whiteness and dust are not easy to coordinate.
[0004] 2. Due to the high temperature and high pressure pulping, the fiber strength is reduced
[0005] 3. These two pulping processes have higher requirements on equipment
Pulping equipment must be able to meet the pressure requirements, and pulping consumes a lot of energy
[0006] 4. A certain pressure is used in the pulping process, and there are unsafe factors
However, this method has the following disadvantages: the environmental pollution load of the waste liquid is large, the dust content of the slurry is high, and the quality of the produced paper is also poor.
However, because the impurity removal system is very complicated, the production cost increases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: Cotton linter biopulping process

[0043] Raw material: Cotton linters, containing 2.0-7.0% impurities

[0044] Add 8-20 tons of water, 2kg of wetting agent TC-1 (content in 100%), 10kg of chelating agent EDTA (content in 100%), xylanase 210 to 2 tons of cotton linters according to the pulp concentration of 10-25%. 6 AXU (amount is calculated according to 1000AXU / kg dry pulp), after mixing and soaking evenly, act at 50-70°C for 1 hour, then directly add NaOH40kg (amount of 2.0%, content of 100%, relative to the amount of absolute dry pulp), H 2 o 2 40kg (amount of 2.0%, the content is 100%, relative to the amount of dry pulp), heat preservation at 80-100°C and normal pressure for 2 hours for steaming and bleaching, after steaming and bleaching, rinse with water until the pH reaches neutral.

[0045] After pulping through the above process, the results of pulp and waste liquid measurement are as follows:

[0046] ·Pulp whiteness reaches 83-85 degrees;

[...

Embodiment 2

[0052] Example 2: Three-stage cotton biopulping process

[0053] Raw material: three-grade cotton, containing 2.0-5.0% impurity

[0054] Add 8-20 tons of water, 2kg wetting agent TC-1 (amount of 0.1%, content in 100%), 10kg chelating agent EDTA (amount of 0.5%, content of 100% meter), xylanase 2 10 6 AXU-4 10 6 AXU (dosage is based on 1000-2000AXU / kg absolute dry pulp), after soaking evenly, act at 50-70°C for 1 hour, then directly add NaOH 60kg (dosage 3.0%, content 100%, relative to the amount of absolute dry pulp), H 2 o 2 40kg (amount of 2.0%, the content is calculated as 100%, relative to the amount of dry pulp), at 80-100 ℃, under normal pressure for 2 hours for steam bleaching, rinse with water after steam bleaching, until the pH reaches neutral.

[0055] After pulping through the above process, the results of the pulp and waste liquid are as follows:

[0056] ·Pulp whiteness reaches 83-85 degrees;

[0057] ·The dustiness of pulp is less than 20mm 2 / 500g;

[...

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Abstract

The biologically pulping process includes the following steps: pre-treating cotton fiber material with polyxylose enzyme to obtain pulp material; and normal pressure and low temperature steaming and rinsing of the pre-treated pulp material with alkali and H2O2. The said pulping process has low cost of eliminating impurity from the material, lowered bleaching chemical liquid consumption and raised paper pulp quality.

Description

technical field [0001] The invention relates to the field of papermaking, more specifically, to a pulping method in the papermaking process. Background technique [0002] The pulping process of cotton fiber raw materials generally adopts the following two methods at home and abroad, namely: the one is caustic soda cooking and hypochlorite bleaching pulping. The second is base-H 2 o 2 High temperature and high pressure steaming and bleaching completes the pulping once. There are following deficiencies in these two pulping processes: [0003] 1. The former has high pollution, low yield, and serious fiber damage; the latter has high requirements for raw materials and insufficient ability to remove dust. When the cotton fiber raw material contains a lot of impurities, problems such as whiteness and dust are not easy to coordinate. [0004] 2. Due to the high temperature and high pressure pulping, the fiber strength is reduced. [0005] 3. These two pulping processes have hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/00D21H11/12
Inventor 曹秀痕刘永红翟红刘向辉周彦魁赵彩凤周清
Owner CHINA BANKNOTE PRINTING & MINTING
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