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Process for preparing dissolved pulp by oxidative degradation of linters

A technology of cotton linter and dissolving pulp, applied in pulp beating/refining method, pulping with inorganic alkali, digester, etc., can solve the problems of shortage of resources, low yield, long cycle, etc., to reduce alkaline hydrolysis , Improve product quality, reduce the effect of organic matter concentration

Active Publication Date: 2008-10-22
YIBIN GRACE GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of serious pollution, low yield, long cycle, and resource shortage in the traditional dissolving pulp preparation process, and propose a method for preparing dissolving pulp by oxygen decomposition of cotton linters by using an oxygen decomposition method, so that the above problems can be solved. Adopting the present invention can increase production speed, improve product quality, save steam consumption, and reduce the generation of pollutants

Method used

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  • Process for preparing dissolved pulp by oxidative degradation of linters
  • Process for preparing dissolved pulp by oxidative degradation of linters
  • Process for preparing dissolved pulp by oxidative degradation of linters

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] a. The sample is cotton linters, dry weight 1Kg

[0021] b. Cold alkali impregnation, impregnation alkali concentration: 60g / l

[0022] c. Impregnation concentration: 12%

[0023] d. Amount of additives added: 0.3%

[0024] e. Dipping time: 5 minutes

[0025] f. Dehydration with a dehydrator after immersion

[0026] g. Squeeze to adjust the bath ratio to 1:3.5

[0027] h. Oxygenation oxygen pressure is 0.6Mpa

[0028] i. Oxygen decomposition oxygen pressure is 0.6Mpa

[0029] j. Oxygen decomposition temperature is 120°C

[0030] k, oxygen decomposition time is 120 minutes.

[0031] This embodiment compares with conventional method:

[0032]

[0033] Example 2:

[0034] a. The sample is cotton linters, dry weight 1Kg

[0035] b. Cold alkali impregnation, impregnation alkali concentration: 80g / l

[0036] c. Impregnation concentration: 10%

[0037] d. Amount of additives added: 0.2%

[0038] e. Dipping time: 5 minutes

[0039] f. Dehydration with a dehydra...

Embodiment 3

[0048] a. The sample is cotton linters, dry weight 1Kg

[0049] b. Cold alkali impregnation, impregnation alkali concentration: 120g / l

[0050] c. Impregnation concentration: 15%

[0051] d. Amount of additives added: 0.2%

[0052] e. Dipping time: 3 minutes

[0053] f. Dehydration with a dehydrator after immersion

[0054] g. Squeeze to adjust the bath ratio to 1:2.7

[0055] h. Oxygenation oxygen pressure is 0.5Mpa

[0056] i. Oxygen decomposition oxygen pressure is 0.5Mpa

[0057] j. Oxygen decomposition temperature is 100°C

[0058] k, oxygen decomposition time is 150 minutes.

[0059] This embodiment compares with conventional method:

[0060]

Embodiment 4

[0062] a. The sample is cotton linters, dry weight 1Kg

[0063] b. Cold alkali impregnation, impregnation alkali concentration: 100g / l

[0064] c. Impregnation concentration: 15%

[0065] d. Amount of additives added: 0.2%

[0066] e. Dipping time: 5 minutes

[0067] f. Dehydration with a dehydrator after immersion

[0068] g. Squeeze to adjust the bath ratio to 1:3

[0069] h. Oxygenation oxygen pressure is 0.4Mpa

[0070] i. Oxygen decomposition oxygen pressure is 0.4Mpa

[0071] j. Oxygen decomposition temperature is 115°C

[0072] k, oxygen decomposition time is 90 minutes.

[0073] This embodiment compares with conventional method:

[0074]

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Abstract

The invention discloses a method for making dissolving pulp by oxidative degradation of cotton linters in the oxidative degradation method, aiming at resolving the problems of serious pollution, low yield, long cycle and insufficient resources, etc. existing in the conventional process of making dissolving pulp. The method comprises the following technological steps of cutting and impurity removal, high consistency mixing pretreatment and impurity removal and poly decreasing by continuous oxidative degradation. The method of the invention has the advantages of improving production speed, improving product quality, saving steam and lowering the generation of pollutants.

Description

technical field [0001] The invention relates to a production method for preparing dissolving pulp by an oxygen decomposition method, in particular a method for preparing cotton linters into a dissolving pulp by using an oxygen decomposition method and continuous steaming. Background technique [0002] The traditional dissolving pulp pulping process is mostly prehydrolysis alkaline cooking and (sulfite) sulphate cooking, which have two major problems of serious pollution and low yield. At the same time, the domestic cotton linter pulping technology is still at a relatively low production level. Except for the mint pulp factory, which has started to use continuous cooking, the others use traditional steaming balls for high-temperature, high-alkali gap cooking. Using the traditional alkaline method and ball steaming for intermittent cooking, the pulping yield is not high, the production scale is small, the product quality is greatly affected by the processing quality of raw cot...

Claims

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Application Information

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IPC IPC(8): D21C5/00D21D1/20D21C3/02D21C7/00
Inventor 邓传东薛勤徐发祥刘爱兵黄俊谢鹏虞良福蒲运龙竭发全
Owner YIBIN GRACE GROUP CO LTD
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