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Wood pomace modified producing technology

A production process and technology of wood pulp, which are applied in the directions of pulp bleaching, pulping with inorganic alkali, pulping of cellulose raw materials, etc., can solve the problems of difficult production, high cost, high ash content and high content of polypentose, and reduce the The effect of pollution and production cost reduction

Active Publication Date: 2007-11-07
YIBIN GRACE GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the average length of bamboo fiber is lower than that of paper-making wood fiber. Due to the high content of ash and polypentose in the production process, bamboo fiber is hard, has more thick-walled fibers, narrow cell cavity, dense fiber tissue, and air in the cells. This leads to disadvantages such as difficult production, large amount of chemical materials, and high cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1. Select 6000Kg of paper-making grade coniferous wood pulp board, and sort it by a pager.

[0014] 2. Alkali impregnation is carried out by spraying NaOH solution with a weight percentage of 6-10% and a bath ratio of 1:3.6-1:4. The concentration of NaOH solution is 30g / l.

[0015] 3. It is conveyed by the belt to the cyclone separator, and the agitator is used for defrosting and dispersing.

[0016] 4. Put the obtained wood pulp into the steaming ball for cooking. The parameters of the cooking step are: the initial temperature of the cooking liquid is ≥80°C, (1) preheating for 10-13 minutes to 105±5°C; (2) after the steam is stopped Then run dry for 27-30 minutes; (3) Adopt 4 times of temperature rise and 3 times of small steam release, the holding temperature is 167±2°C, and the total heating time is 2 hours.

[0017] 5. Send the above-mentioned wood pulp slurry obtained by cooking from the dumping tank to extrusion washing until the residual alkali concentration is...

Embodiment 2

[0022] 1. Select 8000Kg of paper-making grade hardwood pulp board, and sort it by a pager.

[0023] 2. Alkali impregnation is carried out by spraying NaOH solution with a weight percentage of 8-17% and a bath ratio of 1:3-1:3.8.

[0024] 3. It is conveyed by the belt to the cyclone separator, and the agitator is used for defrosting and dispersing.

[0025] 4. Put the obtained wood pulp into the steaming ball for cooking. The parameters of the heating curve of the cooking are: the initial temperature of the cooking liquid is ≥80°C, (1) pre-heating for 10-15 minutes to 105±5°C; (2) stop the steam Then run dry for 25 to 30 minutes; (3) adopt 4 times of heating and 3 times of small steam release, the holding temperature is 167±2°C, and the total heating time is 2 hours.

[0026] 5. Send the above-mentioned wood pulp slurry obtained by cooking from the dumping tank to extrusion washing until the residual alkali concentration is 90-100g / m 3 ; Utilize the desander to carry out cent...

Embodiment 3

[0031] 1. Select 3000Kg of paper-making grade hardwood pulp board, and paginate it through a pagination machine.

[0032] 2. Alkali impregnation is carried out by spraying NaOH solution with a weight percentage of 13-17% and a bath ratio of 1:3.1-1:3.4.

[0033] 3. It is conveyed by the belt to the cyclone separator, and the agitator is used for defrosting and dispersing.

[0034] 4. Put the obtained wood pulp into the steaming ball for cooking. The parameters of the heating curve of the cooking are: the initial temperature of the cooking liquid is ≥80°C, (1) pre-heating for 10-15 minutes to 105±5°C; (2) stop the steam Then run dry for 25 to 30 minutes; (3) adopt 4 times of heating and 3 times of small steam release, the holding temperature is 167±2°C, and the total heating time is 2 hours.

[0035] 5. Send the above-mentioned wood pulp slurry obtained by cooking from the pouring tank to extrusion washing until the residual alkali concentration is 95-100g / m 3 ; Use a desande...

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Abstract

The present invention is process of producing pulp for producing viscose fiber, and solves the technological problem of wood pulp with papermaking level wood pulp sheet. The wood pulp modifying production process includes the following steps: paging the wood pulp sheet, alkali impregnating, dispersing, digesting, washing, depurating, bleaching, secondary washing, and fishing pulp. The process can produce wood pulp with the quality same as that of dissolved pulp and suitable for use in producing viscose fiber, and has low production cost and less environmental pollution.

Description

technical field [0001] The invention relates to a process for the production of pulp for viscose fibers. Background technique [0002] With the development of my country's viscose fiber industry, domestic enterprises mostly use cotton pulp as the raw material for viscose fiber production. The resource of raw cotton linters is increasingly in short supply due to the constraints of planting area and growth cycle. The impact of cycle and ecological balance has seriously restricted the development of my country's viscose fiber industry. For this reason, some enterprises have used dissolving wood pulp for viscose production, but the price of imported dissolving wood pulp is high and fluctuating, which affects the normal operation and economic benefits of the enterprise. Finding a substitute for dissolving wood pulp is an important task for enterprises . [0003] At present, my country produces and imports a large number of paper-grade wood pulp boards, but due to the disadvantag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21C3/22D21C9/14
Inventor 冯涛邓传东黄俊饶芳秋宋伟柳永权
Owner YIBIN GRACE GROUP CO LTD
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