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Pretreatment technique for recovering pressed liquor electrodialysis alkali in viscose fiber production

A viscose fiber and squeeze liquid technology, which is applied in the fields of rayon recycling, fiber chemical characteristics, and final product manufacturing, can solve the problems of low alkali recovery rate and insufficient consideration of the specificity of chemical components, etc., to reduce energy consumption, reduce Viscosity, effect of improving penetration efficiency

Active Publication Date: 2015-07-01
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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Effect test

Embodiment 1

[0032] A pretreatment process for the electrodialysis alkali recovery of squeeze fluid in viscose fiber production. The squeeze fluid with a NaOH content of 100g / L first passes through the pre-filter to remove large particles, and then enters the microporous filter through the pump, and the filtrate passes through the Ultrafiltration recovers lignin and intercepts large molecular weight pollutants, and obtains dilute lye for subsequent electrodialysis treatment.

Embodiment 2

[0034] A pretreatment process of electrodialysis alkali recovery of press liquid in viscose fiber production. The press liquid with NaOH content of 50g / L first passes through the pre-filter to remove large particles, and then enters the microporous filter through the pump, and the filtrate passes through the Ultrafiltration recovers lignin and intercepts large molecular weight pollutants, and obtains dilute lye for subsequent electrodialysis treatment.

[0035] 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

[0037] A pretreatment process for the electrodialysis alkali recovery of squeezed fluid in viscose fiber production. The squeezed fluid with a NaOH content of 200g / L first passes through a pre-filter to remove large particles, and then enters a microporous filter through a pump, and the filtrate is passed through Ultrafiltration recovers lignin and intercepts large molecular weight pollutants, and obtains dilute lye for subsequent electrodialysis treatment.

[0038] 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 technique for recovering pressed liquor electrodialysis alkali in viscose fiber production, which is characterized by comprising the following steps: passing pressed liquor with the NaOH content of 50-200 g / L through a prefilter to remove large granule substances, pumping the pressed liquor into a microporous filter, and ultrafiltering the filtrate to recover lignin and trap high-molecular-weight pollutants to obtain dilute alkali liquor for subsequent electrodialysis treatment. According to the characteristic that viscose fibers generate hemicellulose-containing high-concentration waste alkali in the pressing process, the alkali waste is firstly pretreated, so that the indexes of the waste alkali liquor are suitable for the subsequent electrodialysis alkali recovery technique, thereby lowering the viscosity of the waste liquor, effectively lowering the energy consumption and enhancing the permeation efficiency and operation stability.

Description

technical field [0001] The invention belongs to the technical field of waste recycling in viscose fiber production, and in particular relates to a pretreatment process suitable for the recovery of alkali by electrodialysis of press fluid 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 ord...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F13/02B01D61/44
CPCY02P70/62
Inventor 邓传东易家祥朱小川田启兵王占龙
Owner YIBIN HIEST FIBER
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