Paper-making grade pulp bleaching plate modifying production technique
A technology for bleaching wood pulp and production process, applied in pulp bleaching, papermaking, papermaking and other directions, can solve the problems of slow dissolution of hemicellulose, severe conditions, and difficulty in reducing polymerization, reducing production costs, increasing the content of methyl fiber, The effect of reducing pollution
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Embodiment 1
[0043] Embodiment 1: caustic soda method one
[0044] 1. Use 6000Kg of paper-making grade bleached wood pulp board, and sort it by a pager.
[0045] 2. Soak into a 6.0% (3-6) pulp porridge with 8% (6-11) NaOH.
[0046]3. Use the porridge pump to send it into the press to squeeze and loosen the dispersed fibers.
[0047] 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 (80-120), liquid ratio 1: 3.5; (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) 3 times of small steam release and 4 times of heating Curve, the total heating time is 2 hours; (6) The holding temperature is 155±2°C (140-168).
[0048] 5. Send the above-mentioned wood pulp slurry obtained by cooking from the dumping tank to the squeeze washing material to extract the yellow liquid...
Embodiment 2
[0052] Embodiment 2: caustic soda method two
[0053] 1. Use 6000Kg of paper-making grade bleached wood pulp board, and sort it by a pager.
[0054] 2. Soak it into a 5.0% (3-6) pulp porridge with 11% (6-11) NaOH.
[0055] 3. Use the porridge pump to send it into the press to squeeze and loosen the dispersed fibers.
[0056] 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 100g / l (80-120), liquid ratio 1: 3.5; (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) 3 times of small steam release and 4 times of heating Curve, the total heating time is 2 hours; (6) The holding temperature is 168±2°C (140-168).
[0057] 5. Send the above-mentioned wood pulp slurry obtained by cooking from the dumping tank to the squeeze washing material to extract the yellow l...
Embodiment 3
[0061] Embodiment 3: caustic soda method three
[0062] 1. Use 6000Kg of paper-making grade bleached wood pulp board, and sort it by a pager.
[0063] 2. Dipping into a slurry porridge with a concentration of 4.0% (3-6) with 14% NaOH.
[0064] 3. Use the porridge pump to send it into the press to squeeze and loosen the dispersed fibers.
[0065] 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: 3.5; (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) 3 times of small steam release and 4 times of heating curve, the total heating time is 2 hours; (6) The holding temperature is 172°C.
[0066] 5. Send the above-mentioned wood pulp slurry obtained by cooking from the dumping tank to the squeeze washing material to extract the ...
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