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Diffusion dialysis pretreatment process for black liquor electrodialysis alkali recovery in pulp manufacturing

A technology of diffusion dialysis and electrodialysis, which is applied in the field of waste recycling, can solve the problems of low alkali recovery rate and insufficient consideration of the particularity of chemical components, etc., and achieve the effects of good flocculation effect, shortened service life and high salt content

Inactive Publication Date: 2016-01-20
YIBIN HIEST FIBER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent also does not fully consider the particularity of the chemical components in the viscose fiber waste lye, and the alkali recovery rate of the conventional pretreated lye for further membrane separation is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Diffusion dialysis pretreatment process for black liquor electrodialysis alkali recovery in pulp manufacturing: cooking black liquor with a sodium hydroxide concentration of 8g / L first removes large particles by electrocoagulation, and then enters the membrane module through a pump and transports it to Diffusion dialysis membrane stacks are used to obtain dilute lye for subsequent electrodialysis treatment.

Embodiment 2

[0033] Diffusion dialysis pretreatment process for black liquor electrodialysis alkali recovery in pulp manufacturing: cooking black liquor with a sodium hydroxide concentration of 30g / L first removes large particles by electrocoagulation, and then enters the membrane module through a pump and transports it to Diffusion dialysis membrane stacks are used to obtain dilute lye for subsequent electrodialysis treatment.

[0034] The sodium hydroxide concentration in the pretreated black liquor is 25g / L, and the hemifiber content is 7.5g / L.

Embodiment 3

[0036] Diffusion dialysis pretreatment process for black liquor electrodialysis alkali recovery in pulp manufacturing: cooking black liquor with a sodium hydroxide concentration of 25g / L first removes large particles by electrocoagulation, and then enters the membrane module through a pump and transports it to Diffusion dialysis membrane stacks are used to obtain dilute lye for subsequent electrodialysis treatment.

[0037] The sodium hydroxide concentration in the pretreated black liquor is 20g / L, and the hemifiber content is 5.8g / L.

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Abstract

The invention provides diffusion dialysis pretreatment technology of black liquor electrodialysis alkali recovery in pulp manufacturing. The diffusion dialysis pretreatment technology is characterized in that: large-particle matters of a boiling black liquor with the concentration of sodium hydroxide being 8-30 g / L are removed through use of an electric flocculation method, then the black liquor enters a membrane module through a pump and is conveyed to a diffusion dialysis membrane stack, and a diluted alkaline liquor is obtained for subsequent electrodialysis processing. During a steaming and boiling process, the viscose fiber can produce characteristics of high hemicellulose chroma, high alkalinity, high salt content, and high COD load, according to the produced characteristics, the pretreatment of the black liquor is carried out to make the pretreated black liquor to be suitable for the subsequent electrodialysis alkali recovery process, so that the purposes of high alkali recovery rate, low energy consumption and stable operation can be achieved.

Description

technical field [0001] The invention belongs to the technical field of waste recovery in pulp production, and in particular relates to a diffusion dialysis pretreatment process suitable for black liquor electrodialysis alkali recovery in pulp production. Background technique [0002] Viscose fiber is a chemical fiber processed by chemical and mechanical methods using polymer materials such as wood pulp and cotton pulp containing natural cellulose. Viscose fiber is the kind of chemical fiber that is closest to the performance of natural fiber clothing. It has the characteristics of soft hand feeling, moisture absorption and breathability, elegant hanging, bright dyeing, antistatic and easy textile processing. It is a regenerated fiber derived from nature and superior to nature. Vegan fiber is one of the important raw materials for the textile industry. At present, there are about 40 viscose fiber enterprises in my country. In addition to the production of ordinary viscose fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C11/04
CPCY02P70/10
Inventor 易家祥邓传东朱小川田启兵王占龙
Owner YIBIN HIEST FIBER
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