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Paper-making-stage reclaiming 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: 2010-07-21
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 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 recycled wood pulp board

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1. Use 6000Kg of recycled wood pulp board, and sort through the paging machine.

[0046] 2. Immerse into a slurry porridge with a concentration of 8.0% (4.5-8) with 12% (8-14) NaOH.

[0047] 3. Use the porridge pump to send it into the press to squeeze and loosen the dispersed fibers.

[0048] 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 110g / l (80-118), liquid ratio 1: 3.2; (2) The initial temperature of the cooking liquid is ≥40°C; (3) pre-heating for 10-15 minutes to 105±5°C; (4) idling for 25-30 minutes after the steam is stopped; (5) 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.

[0049] 5. Send the above-mentioned wood pulp slurry obtained by cooking from the dumping tank to extrusion washing to extract the yellow liquid, and wash until the residual alkali is ≤ 10...

Embodiment 2

[0054] 1. Use 6000Kg of recycled wood pulp board, and sort through the paging machine.

[0055] 2. Soak it into a 6.0% (4.5-8) pulp porridge with 8% (8-14) NaOH.

[0056] 3. Use the porridge pump to send it into the press to squeeze and loosen the dispersed fibers.

[0057] 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 120g / l (80-120), liquid ratio 1: 3.2; (2) The initial temperature of the cooking liquid is ≥40°C; (3) pre-heating for 10-15 minutes to 105±5°C; (4) idling for 25-30 minutes after the steam is stopped; (5) 2 times of small steam release and 3 times of heating curve, the total heating time is 2 hours; (6) The holding temperature is 140±2°C.

[0058] 5. Send the above-mentioned wood pulp slurry obtained by cooking from the dumping tank to extrusion washing to extract the yellow liquid, and wash until the residual alkali is ≤ 100g / m3; use a desander to ...

Embodiment 3

[0063] 1. Use 6000Kg of recycled wood pulp board, and sort through the paging machine.

[0064] 2. It is 5.0% (4.5-8) pulp porridge with 14% (8-14) NaOH impregnated into concentration.

[0065] 3. Use the porridge pump to send it into the press to squeeze and loosen the dispersed fibers.

[0066] 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 80g / l (80-120), liquid ratio 1: 3.2; (2) The initial temperature of the cooking liquid is ≥40°C; (3) pre-heating for 10-15 minutes to 105±5°C; (4) idling for 25-30 minutes after the steam is stopped; (5) 2 times of small steam release and 3 times of heating Curve, the total heating time is 2 hours; (6) The holding temperature is 170±2°C (138-155).

[0067] 5. Send the above-mentioned wood pulp slurry obtained by cooking from the dumping tank to extrusion washing to extract the yellow liquid, and wash until the residual alkali ...

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PUM

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Abstract

The present invention provides denaturating production process of paper-making recovered wood pulp sheet pulp superior to available denaturated wood pulp sheet producing process. The denaturating production process includes the following steps: paging paper-making recovered wood pulp sheet in a paging device, alkali dipping in 8-14 % 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 recycled 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 produces ...

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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