Paper-making-stage broad-leaved wood pulp plate denaturalization producing technique

Abstract

The present invention provides denaturating production process of paper-making hardwood pulp sheet pulp superior to available denaturated wood pulp sheet producing process. The denaturating production process includes the following steps: paging paper-making hardwood wood pulp sheet in a paging device, alkali dipping in 6-18 % concentration alkali solution in a dip vat to form 2.5-5.5 % 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 hardwood 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 and i...

Examples

Embodiment 1

[0043] Embodiment 1: sulfate method one

[0044] 1. Use 6000Kg of paper-making grade hardwood pulp board, and sort it by a pager.

[0045] 2. Soak it into a 3.5% (2.5-5.5) pulp porridge with 10% (8-14) 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 80g / l (60-100), and the liquid ratio is 1:3.5 (3.0-4.0); (2) The initial temperature of the cooking liquid is ≥40°C; (3) Preheating for 10-15 minutes to 105 ±5°C; (4) Stop steam and then run dry for 25-30 minutes; (5) Adopt 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 172±2°C. (145-172)

[0048] 5. Send the above-mentioned wood pulp slurry obtained by cooking from the dumping tank to the squeeze washing...

Embodiment 2

[0052] Embodiment 2: sulfate method two

[0053] 1. Use 6000Kg of paper-making grade hardwood pulp board, and sort it by a pager.

[0054] 2. Immerse into a slurry porridge with a concentration of 4.5% (2.5-5.5) with 8% (8-14) 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 100g / l (60-100), and the liquid ratio is 1:3.5 (3.0-4.0); (2) The initial temperature of the cooking liquid is ≥40°C; (3) Preheating for 10-15 minutes to 105 ±5°C; (4) Stop 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 155±2°C. (145-172)

[0057] 5. Send the above-mentioned wood pulp slurry obtained by cooking from the dumping tan...

Embodiment 3

[0061] Embodiment 3: Sulfate method three

[0062] 1. Use 6000Kg of paper-making grade hardwood pulp board, and sort it by a pager.

[0063] 2. Dipping into a 4.5% (2.5-5.5) pulp porridge with 6% 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 120g / l (60-100), and the liquid ratio is 1:3.5 (3.0-4.0); (2) The initial temperature of the cooking liquid is ≥40°C; (3) Preheating for 10-15 minutes to 105 ±5°C; (4) Stop steam and then run dry for 25-30 minutes; (5) Adopt 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 135°C.

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

technical field

[0001] The invention relates to a production method for denaturing papermaking grade hardwood 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 and i...

Examples

Embodiment 1

[0043] Embodiment 1: sulfate method one

[0044] 1. Use 6000Kg of paper-making grade hardwood pulp board, and sort it by a pager.

[0045] 2. Soak it into a 3.5% (2.5-5.5) pulp porridge with 10% (8-14) 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 80g / l (60-100), and the liquid ratio is 1:3.5 (3.0-4.0); (2) The initial temperature of the cooking liquid is ≥40°C; (3) Preheating for 10-15 minutes to 105 ±5°C; (4) Stop steam and then run dry for 25-30 minutes; (5) Adopt 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 172±2°C. (145-172)

[0048] 5. Send the above-mentioned wood pulp slurry obtained by cooking from the dumping tank to the squeeze washing...

Embodiment 2

[0052] Embodiment 2: sulfate method two

[0053] 1. Use 6000Kg of paper-making grade hardwood pulp board, and sort it by a pager.

[0054] 2. Immerse into a slurry porridge with a concentration of 4.5% (2.5-5.5) with 8% (8-14) 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 100g / l (60-100), and the liquid ratio is 1:3.5 (3.0-4.0); (2) The initial temperature of the cooking liquid is ≥40°C; (3) Preheating for 10-15 minutes to 105 ±5°C; (4) Stop 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 155±2°C. (145-172)

[0057] 5. Send the above-mentioned wood pulp slurry obtained by cooking from the dumping tan...

Embodiment 3

[0061] Embodiment 3: Sulfate method three

[0062] 1. Use 6000Kg of paper-making grade hardwood pulp board, and sort it by a pager.

[0063] 2. Dipping into a 4.5% (2.5-5.5) pulp porridge with 6% 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 120g / l (60-100), and the liquid ratio is 1:3.5 (3.0-4.0); (2) The initial temperature of the cooking liquid is ≥40°C; (3) Preheating for 10-15 minutes to 105 ±5°C; (4) Stop steam and then run dry for 25-30 minutes; (5) Adopt 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 135°C.

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