Electric driving membrane treatment process for acid bath wastewater in viscose fiber production

A viscose fiber, electrically driven membrane technology, applied in the direction of fiber chemical characteristics, membrane technology, semi-permeable membrane separation, etc., to solve inventory problems, eliminate steam consumption, great environmental significance and economic benefits

Inactive Publication Date: 2017-06-20
YIBIN GRACE GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of acid bath wastewater treatment after spinning in viscose fiber production, the present invention proposes an electric drive membrane treatment process for acid bath wastewater in viscose fiber production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] An electrically driven membrane treatment process for acid bath wastewater in viscose fiber production, comprising the following steps:

[0039] A. Pretreatment

[0040] Carry out pretreatment to the acid bath solution after spinning;

[0041] B. Electrodialysis

[0042] The pretreated acid bath solution is transported to the electrodialysis membrane module for electrodialysis treatment; the membrane module is composed of multiple pairs of positive membranes and negative membranes arranged alternately, and the acid bath solution is passed into each positive membrane and negative membrane respectively. In the channel between the membranes; two channels of the negative membrane between adjacent channels form a group. In each group of channels, the acid bath solution near the cathode is the raw material solution, and the acid bath solution near the anode is the receiving solution. The contents of sulfuric acid, sodium sulfate and zinc sulfate meet the requirements of the...

Embodiment 2

[0048] This embodiment is on the basis of embodiment 1:

[0049] The positive membrane in the electrodialysis membrane assembly of the B step is H + / Na + ion exchange membrane.

Embodiment 3

[0051] This embodiment is on the basis of embodiment 1:

[0052] The positive membrane in the electrodialysis membrane assembly of the B step is H + / Na + ion exchange membrane.

[0053] The pretreatment of step A refers to the removal of suspended solid impurities by microfiltration, and the SS content is 9 mg / L.

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PUM

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Abstract

The invention provides an electric driving membrane treatment process for acid bath wastewater in viscose fiber production. The electric driving membrane treatment process comprises the following steps: A, pre-treating an acid solution after spinning; B, conveying the pre-treated acid solution after spinning to an electrodialysis membrane module for electrodialysis treatment, and when the contents of sulfuric acid, sodium sulfate and zinc sulfate in a receiving liquid achieves the technical requirements of an acid bath before spinning, performing recovery for spinning; C, performing acid-base neutralization of the raw material liquid subjected to electrodialysis, adjusting the pH value to 8-10 to generate sodium sulfate and zinc hydroxide precipitation, and performing solid-liquid separation to obtain a sodium sulfate solution and a zinc hydroxide solid; and D, conveying the sodium sulfate solution and the acid bath solution after spinning to a bipolar membrane apparatus, performing electrodialysis to recover acid and base, and directly using the acid bath solution and the base solution obtained from electrodialysis to the production system. Deep recovery of sulfuric acid from the acid bath after spinning is achieved, and the acid bath before spinning is directly formed and reused to the production system. According to the process, steam consumption is prevented, and inventory problem of sodium sulfate is solved.

Description

technical field [0001] The invention relates to the technical field of waste recovery in viscose fiber production, in particular to an electric-driven membrane treatment process for acid bath wastewater in viscose fiber production. Background technique [0002] In the spinning process of viscose fiber, the regeneration of cellulose fiber is mainly produced in the form of acid-base neutralization reaction, and the acid-base reaction is mainly carried out in the acid bath, which leads to the sulfuric acid in the acid bath after spinning. As a result of the decrease of sodium sulfate content, the reduction of sodium sulfate content and the consumption of zinc sulfate content. [0003] The increase of sulfuric acid content in the acid bath after spinning is mainly achieved through the evaporation of the acid bath. The main problems are the large steam consumption and the inability to recover zinc sulfate. At the same time, the sodium sulfate produced in the spinning process can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F13/02B01D61/44
CPCB01D61/44D01F13/02Y02P70/62
Inventor 冯涛易家祥陈昌明刘爱兵尚薇伏天兵
Owner YIBIN GRACE GROUP CO LTD
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