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Pre-treatment technology of digestion black liquor in manufacturing of recycling pulp by diffusion dialysis

A technology of diffusion dialysis and recovery of pulp, which is applied in the field of pulp manufacturing, can solve problems such as reducing COD value, achieve the effect of reducing COD value, reducing damage and ensuring service life

Inactive Publication Date: 2013-10-16
YIBIN HIEST FIBER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The present invention aims to solve the existing problems and defects of the existing diffusion dialysis technology for cooking black liquor used in the production of recovered pulp, and provides a pretreatment process for cooking black liquor in the production of recycled pulp by diffusion dialysis. In the cation exchange membrane diffusion dialysis process of cooking black liquor in the recovery of pulp manufacturing, a specific pretreatment method is used to treat the cooking black liquor with specific indicators to reduce the COD value, and then enter the cation exchange membrane to diffuse after obtaining a suitable pretreatment liquid During the dialysis process, improve the recovery rate and recovery of alkali and hemicellulose in the cooking black liquor, reduce the damage of alkali solution to the diffusion dialysis membrane system, improve the service life of the membrane, and ensure the smooth progress of diffusion dialysis and subsequent processes

Method used

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  • Pre-treatment technology of digestion black liquor in manufacturing of recycling pulp by diffusion dialysis

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Experimental program
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Effect test

Embodiment 1

[0050] The pretreatment process of cooking black liquor in the recovery of pulp by diffusion dialysis, adding flocculant to the cooking black liquor with a concentration of sodium hydroxide of 8g / L for flocculation, so that the concentration of flocculant is 5mg / L, and then passing through the filter cloth Pore ​​diameter is 1100g / m 2 plate and frame filter, and then filtered through a microporous membrane with a pore size of 0.1 microns, and finally filtered through an ultrafiltration membrane with a pore size of 20A° to reduce the concentration of large particles of impurities, recover lignin, and obtain The pretreatment solution for the membrane to undergo diffusion dialysis treatment.

Embodiment 2

[0052] The pretreatment process of cooking black liquor in the recovery of pulp by diffusion dialysis, adding a flocculant to the cooking black liquor with a sodium hydroxide concentration of 30g / L for flocculation, so that the concentration of the flocculant is 10mg / L, and then passing through the filter cloth Pore ​​diameter is 1300g / m 2 The plate and frame filter is filtered by a special plate and frame filter, and then filtered through a microporous membrane with a pore size of 1 micron, and finally filtered through an ultrafiltration membrane with a pore size of 1000A° to reduce the concentration of large particles of impurities, recover lignin, and obtain The pretreatment solution for the membrane to undergo diffusion dialysis treatment.

Embodiment 3

[0054] The pretreatment process of cooking black liquor in the recovery of pulp by diffusion dialysis, adding a flocculant to the cooking black liquor with a sodium hydroxide concentration of 19g / L for flocculation, so that the concentration of the flocculant is 7.5mg / L, and then passing through the filter cloth The pore size is 1200g / m 2 plate and frame filter, and then filtered through a microporous membrane with a pore size of 0.55 microns, and finally filtered through an ultrafiltration membrane with a pore size of 510° to reduce the concentration of large particles of impurities, recover lignin, and obtain The pretreatment solution for the membrane to undergo diffusion dialysis treatment.

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Abstract

The invention relates to a pre-treatment technology of digestion black liquor in manufacturing of recycling pulp by diffusion dialysis, which belongs to the technical field of pulp manufacturing. The technical scheme is that adding flocculant to digestion black liquor with sodium hydroxide with the density of 8-30 g / L to conduct flocculation, wherein the density of the flocculant is allowed to be 5-10 mg / L, filtering and treating by a plate frame filter with filtering cloth with the aperture of 1100-1300 g / m2, filtering and treating by a micropore membrane with the aperture of 0.1-1 mum, and filtering and treating by an ultrafiltration membrane with the aperture of 20-1000 A degree, so as to lower the density of large particle impurities, recycle lignose, and obtain pre-treatment liquid used for diffusion dialysis treatment of a cationic exchange membrane. The technology adopts the specific pre-treatment method to treat the digestion black liquor, and then allows the treated digestion black liquor to enter into the diffusion dialysis process, so as to improve the recovery ratio of alkali and hemicellulose in the digestion black liquor, improve the service life of membranes, and guarantees the smooth progress of the diffusion dialysis and subsequent processes.

Description

technical field [0001] The invention relates to a process for material treatment in chemical production, more specifically, the invention relates to a pretreatment process for cooking black liquor in the manufacture of recycled pulp by diffusion dialysis, and belongs to the technical field of pulp manufacture. Background technique [0002] In the viscose fiber production process in the chemical fiber industry, an alkaline liquid containing a high concentration of organic matter (mainly hemicellulose) will be produced. If it is allowed to be discharged directly, it will cause serious environmental pollution. If the lye is treated by neutralization, a large amount of acid will be consumed, and a large amount of inorganic salt will be formed in the lye, so the alkali in the lye is recovered, and the organic matter in it can be harmless Disposal of solid matter is a more environmentally friendly disposal method. [0003] In the process of pulping, the cotton linters are cooked...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 邓传东易家祥朱小川贺敏朱萍田启兵覃川
Owner YIBIN HIEST FIBER