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Novel method for recovering acid and base from viscose fiber sodium sulfate waste liquid by use of bipolar membrane electrodialysis method

A technology of bipolar membrane electrodialysis and sodium sulfate waste liquid is applied in the field of viscose fiber production to achieve the effects of improving yield and quality, reducing damage and increasing service life

Active Publication Date: 2013-10-23
宜宾海翔化工有限责任公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The present invention aims to solve the existing problems and defects in the existing technology of recovering acid and alkali through bipolar membrane electrodialysis for the waste liquid produced in the forming process of viscose fiber strands, and to provide viscose fiber sodium sulfate waste liquid through bipolar membrane electrodialysis. The new method of recycling acid and alkali by polar membrane electrodialysis is only for the process of producing acid and alkali from the waste liquid produced in the process of forming viscose fiber filaments through bipolar membrane electrodialysis, and adopts a specific recovery method, recovery method In the pretreatment step, the waste liquid produced in the process of forming viscose fiber strands is processed, and then enters the bipolar membrane electrodialysis process, which improves the regeneration recovery rate of acid and alkali in the viscose fiber waste liquid, and reduces waste. The damage caused by liquid impurities to the bipolar membrane increases the service life of the bipolar membrane and ensures the smooth progress of bipolar membrane electrodialysis and subsequent processes

Method used

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Experimental program
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Effect test

Embodiment 1

[0036] A new method for recovering acid and alkali from viscose fiber sodium sulfate waste liquid by bipolar membrane electrodialysis, including the following steps in turn: crystallization, pH adjustment, primary filtration, O 3 Redox substances, secondary primary filtration, activated carbon to remove organics, ion exchange resin to remove zinc ions, pp microporous filtration and fine filtration, acid-base preparation and concentration;

[0037] The crystallization is to generate sodium sulfate crystals by high-temperature crystallization of waste liquid with a sodium sulfate content of 200 g / L generated in the viscose fiber strand forming process;

[0038] The pH adjustment is to first dissolve the sodium sulfate crystals with demineralized water to obtain a sodium sulfate solution with a concentration of 3%, then add sodium carbonate to the sodium sulfate solution, adjust the pH of the solution to 8, and add sodium carbonate to dissolve the sodium sulfate solution in the so...

Embodiment 2

[0058] A new method for recovering acid and alkali from viscose fiber sodium sulfate waste liquid by bipolar membrane electrodialysis, including the following steps in turn: crystallization, pH adjustment, primary filtration, O 3 Redox substances, secondary primary filtration, activated carbon to remove organics, ion exchange resin to remove zinc ions, pp microporous filtration and fine filtration, acid-base preparation and concentration;

[0059] The crystallization is to generate sodium sulfate crystals through high temperature crystallization of waste liquid with a sodium sulfate content of 300 g / L generated in the viscose fiber strand forming process;

[0060] The described pH adjustment is to first dissolve sodium sulfate crystals with demineralized water to obtain a sodium sulfate solution with a concentration of 7%, then add sodium carbonate to the sodium sulfate solution, adjust the pH of the solution to 9, and add sodium carbonate to dissolve the sodium sulfate solutio...

Embodiment 3

[0080] A new method for recovering acid and alkali from viscose fiber sodium sulfate waste liquid by bipolar membrane electrodialysis, including the following steps in turn: crystallization, pH adjustment, primary filtration, O 3 Redox substances, secondary primary filtration, activated carbon to remove organics, ion exchange resin to remove zinc ions, pp microporous filtration and fine filtration, acid-base preparation and concentration;

[0081] The crystallization is to generate sodium sulfate crystals through high temperature crystallization of waste liquid with a sodium sulfate content of 300 g / L generated in the viscose fiber strand forming process;

[0082] The pH adjustment is to first dissolve the sodium sulfate crystals with demineralized water to obtain a sodium sulfate solution with a concentration of 12%, then add sodium carbonate to the sodium sulfate solution, adjust the pH of the solution to 9, and add sodium carbonate to dissolve the sodium sulfate solution in ...

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Abstract

The invention discloses a novel method for recovering an acid and a base from a viscose fiber sodium sulfate waste liquid by use of a bipolar membrane electrodialysis method. The novel method is characterized by successively including the following steps: crystallization, regulation of pH, first prefiltration, oxidation of reducing substances by O3, secondary prefiltration, removal of organic matters by activated carbon, removal of zinc ions by ion exchange resin, fine filtration by pp microporous filtration, and preparation and concentration of the acids and bases. Through use of the novel method, the regeneration recovery rate of the acid and base in the viscose fiber waste liquid can be improved, bipolar membrane damage caused by impurities of the waste liquid can be reduced, the service life of the bipolar membrane can be improved, and the novel method can ensure that bipolar membrane electrodialysis and subsequent processes are carried out smoothly.

Description

technical field [0001] The invention relates to a method for material processing in chemical production, and more particularly to a new method for recovering acid and alkali from viscose fiber sodium sulfate waste liquid by bipolar membrane electrodialysis, which belongs to the technical field of viscose fiber production. Background technique [0002] In the viscose fiber forming process in the chemical fiber industry, the viscose acts with an acidic coagulation bath to neutralize the alkali, and the sodium cellulose sulfonate is decomposed to regenerate hydrated cellulose. During this process, the cellulose sulfonate in the viscose Ester, free NaOH, and Na due to side reactions 2 CS 3 , polysulfur compounds and other side reaction products will react with sulfuric acid in the coagulation bath to form sodium sulfate. The viscose fiber production includes an acid bath process that consumes sulfuric acid, a pulp dipping process that consumes sodium hydroxide, an alkali cellu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F13/02B01D61/44
CPCY02P70/62
Inventor 冯涛邓传东易家祥胡小东朱小川李殿洪廖廷高
Owner 宜宾海翔化工有限责任公司
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