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A kind of electrodialysis alkali recovery process in viscose fiber production

A viscose fiber, electrodialysis technology, applied in water/sludge/sewage treatment, dispersed particle separation, water/sewage multi-stage treatment, etc., to achieve the effect of ensuring recovery rate, improving efficiency, and simple process flow

Active Publication Date: 2015-08-19
YIBIN HIEST FIBER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of waste alkali recovery in viscose fiber production, the present invention proposes an electrodialysis alkali recovery process suitable for viscose fiber production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] An electrodialysis alkali recovery process in viscose fiber production. The pretreated waste alkali solution and desalted water are transported to the membrane module through the pump at a flow ratio of 1:1 to the electrodialysis membrane unit for electrodialysis recovery. Lye, the concentration of sodium hydroxide in the pretreated waste lye is 50 g / L, and the semi-fiber content is 30 g / L.

Embodiment 2

[0033] An electrodialysis alkali recovery process in viscose fiber production. The pretreated waste alkali solution and desalted water are transported to the membrane module through the pump at a flow ratio of 2:1 to the electrodialysis membrane unit for electrodialysis recovery. Lye, the sodium hydroxide concentration of the pretreated waste lye is 90 g / L, and the semi-fiber content is 20 g / L.

[0034] The spent lye and demineralized water enter the electrodialysis membrane unit in a cross-flow manner.

Embodiment 3

[0036] An electrodialysis alkali recovery process in viscose fiber production. The pretreated waste alkali solution and desalted water are transported to the membrane module through the pump at a flow ratio of 1.5:1 to the electrodialysis membrane unit for electrodialysis recovery. Lye, the concentration of sodium hydroxide in the pretreated waste lye is 200g / L, and the semi-fiber content is 150g / L.

[0037] The spent lye and demineralized water enter the electrodialysis membrane unit in a cross-flow manner.

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Abstract

The invention provides an electrodialysis alkali recovery technology during viscose fiber production, which is characterized by comprising the steps that pretreated waste alkali liquor and de-mineralized water at a flow ratio of (1-2):1 enter a membrane module by a pump, and are conveyed to an electrodialysis membrane module device for alkali liquor electrodialysis recovery, wherein a concentration of sodium hydroxide of the pretreated waste alkaline liquor is 50-200g / L, and the content of hemicellulose is 20-150g / L. According to the characteristic that high-concentration waste alkaline liquor containing the hemicellulose is generated during a viscose fiber production course, an optimized technological parameter is selected, so that the electrodialysis alkali recovery technology has the advantages of high alkali recovery rate, low energy consumption and stability in operation.

Description

technical field [0001] The invention relates to an alkali recovery process, in particular to an electrodialysis alkali recovery process in viscose fiber production, and belongs to the technical field of waste 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 (fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/469C02F9/06
Inventor 冯涛邓传东易家祥朱小川唐孝兵莫世清田启兵
Owner YIBIN HIEST FIBER
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