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Ultrafiltration pretreatment process of electrodialysis alkali recovery in viscose fiber production

A viscose fiber and squeeze fluid technology, applied in ultrafiltration, rayon recovery, fiber chemical characteristics, etc., can solve the problems of low alkali recovery rate and insufficient consideration of the specificity of chemical components, etc., to reduce energy consumption and viscosity , good filtering effect

Active Publication Date: 2015-11-04
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

[0030] In the production of viscose fiber, the squeezed liquid is an ultrafiltration pretreatment process for electrodialysis alkali recovery. The squeezed liquid with a NaOH content of 156g / L is first filtered through a pre-filter to remove large particles of impurities, and then through ultrafiltration to recover lignin and cut off large molecular weight The resulting permeate containing NaOH is used for subsequent electrodialysis treatment.

Embodiment 2

[0032] In the production of viscose fiber, the squeezed liquid is an ultrafiltration pretreatment process for electrodialysis alkali recovery. The squeezed liquid with a NaOH content of 50g / L is first filtered through a pre-filter to remove large particles of impurities, and then through ultrafiltration to recover lignin and cut off large molecular weight The resulting permeate containing NaOH is used for subsequent electrodialysis treatment.

[0033] The sodium hydroxide concentration of the squeezed liquid after pretreatment is 50g / L, and the half fiber content is 20g / L.

Embodiment 3

[0035] In the production of viscose fiber, the squeezed liquid electrodialysis alkali recovery ultrafiltration pretreatment process, the squeezed liquid with a NaOH content of 200g / L is first filtered through a pre-filter to remove large particles of impurities, and then ultrafiltration is used to recover lignin and cut off large molecular weight The resulting permeate containing NaOH is used for subsequent electrodialysis treatment.

[0036] The pretreatment squeezed liquid has a sodium hydroxide concentration of 200 g / L and a half fiber content of 150 g / L.

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Abstract

The invention provides an ultrafiltration 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 impurities, and ultrafiltering to recover lignin and trap high-molecular-weight pollutants to obtain NaOH-containing permeation 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 recovery in the production of viscose fibers, and specifically relates to an ultrafiltration pretreatment process suitable for the recovery of squeezed liquid electrodialysis alkali in the production of viscose fibers. Background technique [0002] Viscose fiber is a chemical fiber processed by chemical and mechanical methods using polymer materials containing natural cellulose, wood pulp and cotton pulp. Viscose fiber is the kind of chemical fiber that has the closest performance to natural fiber clothing. It has the characteristics of soft hand feeling, moisture absorption and breathability, hanging and elegant, bright dyeing, antistatic and easy to spin and process. It is derived from natural and superior to natural recycled fibers. Plain fiber is one of the important materials for the textile industry. There are currently about 40 viscose fiber enterprises in my country. In addition to the produ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F13/02B01D61/44B01D61/16
CPCY02P70/627Y02P70/62
Inventor 易家祥邓传东朱小川田启兵王占龙
Owner YIBIN HIEST FIBER
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