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Paper-making-stage primary color wood pulp plate denaturalization producing technique

A production process, wood pulp board technology, applied in the direction of papermaking, paper machine, pulp bleaching, etc., can solve the problems of slow dissolution of hemicellulose, severe conditions, and difficulty in reducing polymerization, so as to reduce production costs, increase methylcellulose content, The effect of reducing pollution

Active Publication Date: 2010-05-19
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 board, slow dissolution of hemicellulose, difficulty in depolymerization, uneven cooking, single cooking method, single bleaching method and conditions. Serious and other deficiencies, provide a method for producing soluble wood pulp for viscose fiber from insoluble paper-making grade wood pulp board, especially for the denaturation production process of paper-making grade primary color wood pulp board

Method used

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  • Paper-making-stage primary color wood pulp plate denaturalization producing technique
  • Paper-making-stage primary color wood pulp plate denaturalization producing technique
  • Paper-making-stage primary color wood pulp plate denaturalization producing technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: sulfate method one

[0043] 1. Use 6000Kg of paper-making grade primary color wood pulp board, and sort through the pager.

[0044] 2. Soak into a 7.5% (4.5-8) pulp porridge with 18% (13-18) NaOH.

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

[0046] 4. Put the pressed wood pulp into the digester for cooking. The process conditions are: (1) Cooking agent: NaOH+Na 2 S(NaOH), the total alkali concentration of the cooking liquid is 90g / l (60-110), and the liquid ratio is 1:3.5; (2) The initial temperature of the cooking liquid is ≥40°C; (3) Preheating for 10-15 minutes to 105±5 ℃; (4) Stop steam and then run dry for 25 to 30 minutes; (5) Use 2 small steam releases and 3 heating curves, with a total heating time of 2 hours; (6) Holding temperature 170±2°C (155-172) .

[0047] 5. Send the above-mentioned wood pulp slurry obtained by cooking from the dumping tank to the squeeze washing material to extr...

Embodiment 2

[0051] Embodiment 2: sulfate method two

[0052] 1. Use 6000Kg of paper-making grade primary color wood pulp board, and sort through the pager.

[0053] 2. It is 6.5% (4.5-8) pulp porridge with 14% (13-18) NaOH dipping into concentration.

[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 100g / l (60-110), and the liquid ratio is 1:3.5; (2) The initial temperature of the cooking liquid is ≥40°C; (3) Preheating for 10-15 minutes to 105±5°C; ( 4) Turn off the steam and then run dry for 25-30 minutes; (5) Use 2 small steam releases and 3 heating curves, and the total heating time is 2 hours; (6) The holding temperature is 160±2°C (155-172).

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

Embodiment 3

[0060] Embodiment 3: Sulfate method three

[0061] 1. Use 6000Kg of paper-making grade primary color wood pulp board, and sort through the pager.

[0062] 2. Dipping into a 5.5% (4.5-8) pulp porridge with 10% (13-18) NaOH.

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

[0064] 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 (60-110), and the liquid ratio is 1:3.5; (2) The initial temperature of the cooking liquid is ≥40°C; (3) Preheating for 10-15 minutes to 105±5°C; ( 4) Turn off the steam and then run dry for 25-30 minutes; (5) Adopt 2 times of small steam release and 3 times of heating curve, the total heating time is 2 hours; (6) The holding temperature is 150±2°C (155-172).

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

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PUM

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Abstract

The present invention provides denaturating production process of paper-making unbleached wood pulp sheet pulp superior to available denaturated wood pulp sheet producing process. The denaturating production process includes the following steps: paging paper-making unbleached wood pulp sheet in a paging device, alkali dipping in 8-18 % concentration alkali solution in a dip vat to form 4.5-8 % 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 papermaking grade primary color wood pulp board 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 prod...

Claims

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Application Information

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Patent Type & Authority Patents(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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