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Pretreatment technology of electrodialysis alkali recovery during viscose fiber production

A technology of viscose fiber and electrodialysis, which is applied in the direction of semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of low alkali recovery rate and insufficient consideration of the specificity of chemical components, etc., and achieve good flocculation effect, The effect of shortening the service life and improving the permeation efficiency

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

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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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Embodiment 1

[0027] A pretreatment process for electrodialysis alkali recovery in viscose fiber production. The squeezed liquid with a NaOH content of 150g / L first removes large particles by electrocoagulation, and then enters the microporous filter through a pump, and then pumps the filtrate into Diffusion dialysis membrane separation system, the obtained dialysate is lye, the lye is recovered, and the concentrated liquid is the pretreated squeeze liquid for subsequent electrodialysis treatment.

Embodiment 2

[0029] A pretreatment process for electrodialysis alkali recovery in viscose fiber production. The squeezed liquid with a NaOH content of 50g / L first removes large particles by electrocoagulation, and then enters the microporous filter through a pump, and then pumps the filtrate into Diffusion dialysis membrane separation system, the obtained dialysate is lye, the lye is recovered, and the concentrated liquid is the pretreated squeeze liquid for subsequent electrodialysis treatment.

[0030] After pretreatment, the concentration of sodium hydroxide in the pressed liquid is 50g / L, and the content of semi-fiber is 20g / L.

Embodiment 3

[0032] A pretreatment process for electrodialysis alkali recovery in viscose fiber production. The squeezed liquid with a NaOH content of 200g / L first removes large particles by electrocoagulation, and then enters the microporous filter through a pump, and the filtrate is pumped into the Diffusion dialysis membrane separation system, the obtained dialysate is lye, the lye is recovered, and the concentrated liquid is the pretreated squeeze liquid for subsequent electrodialysis treatment.

[0033] After pretreatment, the concentration of sodium hydroxide in the pressed liquid is 200g / L, and the content of semi-fiber is 150g / L.

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Abstract

The invention provides a pretreatment technology of electrodialysis alkali recovery during viscose fiber production. The pretreatment technology is characterized by comprising the steps that pressed liquor with the content of NaOH of 50-200g / L is subjected to large-particle substance removal by an electric flocculation method, and then enters a microporous filter by a pump; a filtrate is pumped in a membrane module and conveyed to a diffusion dialysis membrane stack; and dilute alkali liquor is obtained and used for subsequent electrodialysis treatment. According to the characteristic that high-concentration waste alkali containing hemicellulose is generated during a viscose fiber pressing course, the waste alkali is pretreated to allow an index of waste alkali liquor to be suitable for a subsequent electrodialysis alkali recovery technology, so that the viscidity of the waste liquor is reduced; energy consumption is reduced effectively; and the penetration efficiency and the operation stability are improved.

Description

technical field [0001] The invention belongs to the technical field of waste recovery in viscose fiber production, and in particular relates to a pretreatment process suitable for electrodialysis alkali recovery in viscose fiber 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 fibers (fila...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/44
Inventor 易家祥邓传东朱小川田启兵王占龙
Owner YIBIN HIEST FIBER
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