Paper-making-stage wood pulp plate denaturalization producing technique

A production process, wood pulp board technology, applied in the field of viscose fiber pulp, can solve the problems of severe conditions, single bleaching method, slow dissolution of hemicellulose, etc., to reduce pollution, increase methylcellulose content, and reduce production costs Effect

Active Publication Date: 2008-03-26
YIBIN GRACE GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is that the above-mentioned existing denatured wood pulp production process has uneven impregnation of wood pulp sheets, slow dissolution of hemicellulose, difficulty in depolymerization, uneven cooking, single cooking method, single bleaching method and conditions Insufficiencies such as severe, narrow range of wood pulp board selection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1. Use 6000Kg of paper-making grade coniferous wood pulp board, and paginate through the pagination machine.

[0044] 2, with 6-12%, (preferably 8%) NaOH is soaked into the gruel that concentration is 3-6% (preferably 4.5%).

[0045]3. Use the porridge pump to send it into the press to squeeze and loosen the dispersed fibers.

[0046] 4. Put the squeezed wood pulp into the digester for cooking. The process conditions are: (1) Cooking agent: NaOH, total alkali concentration of cooking liquid 80-120g / l (preferably 100g / l), liquid ratio 1: 2.5- 3.5 (preferably 1:2.5); M-101 additive can be added, the addition amount is 0.15-0.25%; (2) The initial temperature of the cooking liquid is ≥ 40°C; (3) Pre-heating for 10-15 minutes to 105±5°C ; (4) Run dry for 25 to 30 minutes after the steam is stopped; (5) Use 3 times of small steam release and 4 times of heating curve, and the total heating time is 2 hours; (6) The holding temperature is 138-160°C (preferably 140±2°C ).

[0...

Embodiment 2

[0052] 1. Use 6000Kg of paper-making grade hardwood pulp board, and sort it by a pager.

[0053] 2. Immerse it into a 3.5% (2.5-5.5%) NaOH with a preferred 10% (range 8-14%, the same below) NaOH.

[0054] 3. Use the porridge pump to send it into the press to squeeze and loosen the dispersed fibers.

[0055] 4. Put the pressed wood pulp into the digester for cooking. The process conditions are: (1) Cooking agent: NaOH+Na 2 S, the total alkali concentration of the cooking liquid is 80g / l (60-100g / l), the liquid ratio is 1:3.5 (3.0-4.0); (2) the initial temperature of the cooking liquid is ≥40°C; (3) the preheating is 10-15 minutes, to 105±5°C; (4) run dry for 25 to 30 minutes after the steam is stopped; (5) use 2 times of small steam release and 3 times of heating curve, and the total heating time is 2 hours; (6) The holding temperature is 155±2°C. (145-172°C)

[0056] 5. Send the above-mentioned wood pulp slurry obtained by cooking from the dumping tank to the squeeze washin...

Embodiment 3

[0061] 1. Use 6000Kg of paper-making grade coniferous wood pulp board, and paginate through the pagination machine.

[0062] 2. It is 4.0% (3.5-5.5%) pulp porridge soaked with 14% (10-16%) NaOH.

[0063] 3. Use the porridge pump to send it into the press to squeeze and loosen the dispersed fibers.

[0064] 4. Put the squeezed wood pulp into the digester for cooking. The process conditions are: (1) Cooking agent: Na 2 SO 3 +NaOH, the total acid content of the cooking liquid is 8% (5-9%), and the liquid ratio is 1:4.0 (1:2.5-4.0); (2) The initial temperature of the cooking liquid is ≥40°C; (3) Preheating for 10-15 minutes , to 105±5°C; (4) run dry for 25 to 30 minutes after the steam is stopped; (5) use 2 times of small steam release and 3 times of heating curve, and the total heating time is 2 hours; (6) The holding temperature is 160±2°C (150-172°C).

[0065] 5. Send the above-mentioned wood pulp slurry obtained by cooking from the dumping tank to extrusion washing to extr...

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PUM

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Abstract

The present invention provides denaturating production process of paper-making wood pulp sheet pulp superior to available denaturated wood pulp sheet producing process. The denaturating production process includes the following steps: paging paper-making wood pulp sheet in a paging device, alkali dipping in 6-18 % concentration alkali solution in a dip vat to form 2.5-8 % concentration pulp, extruding in a extrude, debonding fiber, digesting, washing, depurating, bleaching, washing for the second time, and fishing pulp. The process can obtain high quality wood pulp of soluble viscose fiber stably and has wide material source.

Description

technical field [0001] The invention relates to a production method for denaturing paper-grade wood pulp board into soluble viscose fiber pulp. Background technique [0002] With the development of my country's viscose fiber industry, domestic enterprises mostly use cotton pulp as the raw material for the production of viscose fiber. The resource of raw cotton linters is increasingly in short supply due to the constraints of planting area and growth cycle. Prominent, the impact of long 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 numb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/00D21B1/12D21C1/06D21C7/00D21C3/02D21C3/04D21C9/02D21C9/08D21C9/12D21C9/16D21F13/00
Inventor 冯涛邓传东孙毅薛勤徐发祥饶芳秋宋伟柳永权黄俊
Owner YIBIN GRACE GROUP CO LTD
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