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Method for recovering acid and alkali from viscose fiber sodium sulfate waste liquid through bipolar membrane electrodialysis

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

Active Publication Date: 2016-02-10
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 method of recovering acid and alkali by polar membrane electrodialysis is only aimed at the process of producing acid and alkali from the waste liquid produced in the process of forming viscose fiber strands through bipolar membrane electrodialysis. A specific recovery method is adopted. In the recovery method The pretreatment step is to treat the waste liquid generated during the forming process of viscose fiber strands, and then enter the bipolar membrane electrodialysis process, which improves the regeneration recovery rate of acid and alkali in the viscose fiber waste liquid and reduces the waste liquid Impurities cause damage to the bipolar membrane, improve the service life of the bipolar membrane, and ensure 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] The method for reclaiming acid-base of viscose fiber sodium sulfate waste liquid through bipolar membrane electrodialysis method comprises the following steps successively: crystallization, pH adjustment, primary filtration once, O 3 Redox substances, secondary primary filtration, activated carbon to remove organic matter, ion exchange resin to remove zinc ions, pp microporous filtration and fine filtration, acid and alkali preparation and concentration;

[0037] Described crystallization is that the waste liquid that sodium sulfate content is 200g / L is generated sodium sulfate crystal through high-temperature crystallization by viscose fiber strand forming process;

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

Embodiment 2

[0058] The method for reclaiming acid-base of viscose fiber sodium sulfate waste liquid through bipolar membrane electrodialysis method comprises the following steps successively: crystallization, pH adjustment, primary filtration once, O 3 Redox substances, secondary primary filtration, activated carbon to remove organic matter, ion exchange resin to remove zinc ions, pp microporous filtration and fine filtration, acid and alkali preparation and concentration;

[0059] Described crystallization is that the waste liquid that sodium sulfate content is 300g / L is generated sodium sulfate crystal through high-temperature crystallization by viscose fiber strand forming process;

[0060] Described adjusting pH is to first dissolve sodium sulfate crystal with desalinated water, obtain the sodium sulfate solution that concentration is 7%, then add sodium carbonate in sodium sulfate solution, the pH value of solution is modulated 9, add sodium carbonate and sodium sulfate solution can b...

Embodiment 3

[0080] The method for reclaiming acid-base of viscose fiber sodium sulfate waste liquid through bipolar membrane electrodialysis method comprises the following steps successively: crystallization, pH adjustment, primary filtration once, O 3 Redox substances, secondary primary filtration, activated carbon to remove organic matter, ion exchange resin to remove zinc ions, pp microporous filtration and fine filtration, acid and alkali preparation and concentration;

[0081] Described crystallization is that the waste liquid that sodium sulfate content is 300g / L is generated sodium sulfate crystal through high-temperature crystallization by viscose fiber strand forming process;

[0082] Described adjusting pH is to first dissolve sodium sulfate crystal with desalinated water, obtain the sodium sulfate solution that concentration is 12%, then add sodium carbonate in sodium sulfate solution, the pH value of solution is modulated 9, add sodium carbonate and sodium sulfate solution can ...

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Abstract

The invention discloses a 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 method successively includes 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 acid and base. Through use of the method, 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 method can ensure that bipolar membrane electrodialysis and subsequent processes are carried out smoothly.

Description

technical field [0001] The invention relates to a material treatment method in chemical production. More specifically, the invention relates to a method for recovering acid and alkali from viscose fiber sodium sulfate waste liquid through 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 and the acidic coagulation bath interact to neutralize the alkali, decompose the sodium cellulose sulfonate and regenerate hydrated cellulose, and the cellulose sulfonate in the viscose during this process Ester, free NaOH, and Na produced by side reactions 2 CS 3 Side reaction products such as polysulfides and polysulfides will react with sulfuric acid in the coagulation bath to generate sodium sulfate. Viscose fiber production includes the acid bath process that consumes sulfuric acid, and also includes the pulp soaking process t...

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 冯涛邓传东易家祥胡小东朱小川李殿洪罗凯
Owner 宜宾海翔化工有限责任公司
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