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Whiten method for preparing bamboo chemical dissolving pulp and application thereof

A technology for chemically dissolving, bamboo

Inactive Publication Date: 2009-06-03
YIBIN GRACE GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]The existing bamboo dissolving pulp production and preparation methods all use relatively backward equipment and technology, low production efficiency, unstable product quality, difficult to meet environmental protection standards, and relatively huge investment
Difficult to scale
[0006] Its bleaching process adopts C-E-H bleaching. The waste water pollution load produced by this bleaching process is large, and dioxin is produced. This substance is an internationally recognized carcinogen and is harmful to aquatic organisms. Toxic

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Oxygen delignification section process requirements:

[0093] h) Slurry concentration: 8%

[0094] i) Oxygen pressure: 0.4mpa

[0095] j) Oxygen (O 2 ) Purity: 90%

[0096] k) Alkali consumption: 1.0%

[0097] 1) Heating temperature: 60°C

[0098] m) residence time in the oxygen delignification tower: 30min

[0099] n) Cleanliness: Na 2 SO 4 =5kg / t pulp.

Embodiment 2

[0101] Oxygen delignification section process requirements:

[0102] a) Slurry concentration: 10%

[0103] b) Oxygen pressure: 0.7mpa

[0104] c) Oxygen (O 2 ) purity: = 92%

[0105] d) Alkali consumption: 3%

[0106] e) Heating temperature: 78°C

[0107] f) Residence time in the oxygen delignification tower: 60min

[0108] g) Cleanliness: Na 2 SO 4 =4.8kg / t slurry.

Embodiment 3

[0110] Oxygen delignification section process requirements:

[0111] a) Slurry concentration: 12%

[0112] b) Oxygen pressure: 1.0mpa

[0113] c) Oxygen (O 2 ) purity: = 91%

[0114] d) Alkali consumption: 5.0%

[0115] e) Heating temperature: 95°C

[0116] f) Residence time in the oxygen delignification tower: 90min

[0117] g) Cleanliness: Na 2 SO 4 =4.9kg / t pulp.

[0118] 2) Chlorine dioxide treatment section:

[0119] The slurry after oxygen delignification is sent to the medium-consistency mixer, and H is introduced into the medium-concentration mixer 2 After O and heating, it is sent to the chlorine dioxide treatment tower. After the slurry meets the process requirements, it is sent to a vacuum (pressure) washing machine for washing, and the cleaned slurry is stored in the slurry storage tank for standby

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Abstract

Aiming at current situations of cotton and wood dissolving pulp, characters of bamboo material and many disadvantages existing in the existing whiten method for preparing dissolving pulp, the invention provides a whiten method for preparing bamboo material chemical dissolving pulp. The chemical dissolving pulp produced by the invention can be widely applied to derivant industry of celluloses, such as spinning viscose fiber, cellulose nitrate, acetate fiber, etc. The whiten method in the invention uses element-free chlorine bleaching or total chlorine free bleaching, thereby solving the problems existing in the whiten method of bamboo material chemical dissolving pulp and preparing bamboo material chemical dissolving pulp high-efficiently with low energy consumption, low material consumption and low pollution.

Description

technical field [0001] The invention relates to a method for producing chemically dissolving pulp by using bamboo, and the produced chemically dissolving pulp can be widely used in the industries of cellulose derivatives such as textile viscose fiber, nitrocellulose and acetate fiber. Specifically, it is the bleaching method in the production method of bamboo wood production chemical dissolving pulp, especially the bleaching method for preparing bamboo wood dissolving pulp proposed for the needs of textile viscose fiber in the present invention. Background technique [0002] Chemical dissolving pulp is widely used in textile viscose fiber, nitrocellulose, acetate fiber and other cellulose derivative industries. It has a wide range of uses and a large market demand. Among the existing chemical dissolving pulps, cotton linters, coniferous woods, and hardwoods are mainly cottonwood dissolving pulps as the main raw materials. Due to the year-by-year decrease in cotton planting...

Claims

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Application Information

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IPC IPC(8): D21C9/10D21C9/14D21C3/00D21C9/02D21C9/16D21C3/02D21C9/00D21H21/32D21H21/14
Inventor 薛勤于渭东徐发祥刘爱兵
Owner YIBIN GRACE GROUP CO LTD
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