Paper-making-stage high viscosity wood pulp plate denaturalization producing technique

A production process and technology of wood pulp board, applied in papermaking, papermaking machine, pulp bleaching and other directions, can solve the problems of severe conditions, slow dissolution of hemicellulose, difficulty in reducing polymerization, etc. The effect of reducing pollution

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

[0013] 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 To solve the severe and other deficiencies, provide a method for producing soluble wood pulp for viscose fiber from insoluble paper-grade wood pulp board, especially for the denaturation production process of paper-grade high-viscosity wood pulp board

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1: sulfate method one

[0044] 1. Use paper-making grade high-viscosity wood pulp board 6000Kg, and paginate through the pagination machine.

[0045]2. Immerse into a slurry porridge with a concentration of 3.0% (2.5-4.0) with 16% (12-18) NaOH.

[0046] 3. Use the porridge pump to send it into the press to squeeze and loosen the dispersed fibers.

[0047] 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 120g / l (80-120), and the liquid ratio is 1:4.0; (2) The initial temperature of the cooking liquid is ≥40°C; (3) Preheating for 10-15 minutes to 105±5°C; ( 4) After stopping the steam, run it dry for 25 to 30 minutes; (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 140±2°C.

[0048] 5. Send the above-mentioned wood pulp slurry obtained by cooki...

Embodiment 2

[0052] Embodiment 2: sulfate method two

[0053] 1. Use paper-making grade high-viscosity wood pulp board 6000Kg, and paginate through the pagination machine.

[0054] 2. Immerse into a slurry porridge with a concentration of 4.0% (2.5-4.0) with 18% (12-18) NaOH.

[0055] 3. Use the porridge pump to send it into the press to squeeze and loosen the dispersed fibers.

[0056] 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 110g / l (80-120), and the liquid ratio is 1:4.0; (2) The initial temperature of the cooking liquid is ≥40°C; (3) Preheating for 10-15 minutes to 105±5°C; ( 4) Turn off steam and then run dry for 25 to 30 minutes; (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 160°C (160-172).

[0057] 5. Send the above-mentioned wood pulp slurry obtained by c...

Embodiment 3

[0061] Embodiment 3: Sulfate method three

[0062] 1. Use paper-making grade high-viscosity wood pulp board 6000Kg, and paginate through the pagination machine.

[0063] 2. Soak into a 4.5% pulp porridge with 12% (12-18) NaOH.

[0064] 3. Use the porridge pump to send it into the press to squeeze and loosen the dispersed fibers.

[0065] 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 (80-120), and the liquid ratio is 1:4.0; (2) The initial temperature of the cooking liquid is ≥40°C; (3) Preheating for 10-15 minutes to 105±5°C; ( 4) Turn off steam and then run dry for 25 to 30 minutes; (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 172°C (160-172).

[0066] 5. Send the above-mentioned wood pulp slurry obtained by cooking from the dumping tank to the sq...

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PUM

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Abstract

The present invention provides denaturating production process of paper-making high viscosity wood pulp sheet pulp superior to available denaturated wood pulp sheet producing process. The denaturating production process includes the following steps: paging paper-making high viscosity wood pulp sheet in a paging device, alkali dipping in 8-18 % concentration alkali solution in a dip vat to form 2.5-4.5 % 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 papermaking-grade high-viscosity wood pulp boards into dissolving-grade 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 pr...

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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