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Method for recovering acid and alkali from viscose sodium sulfate waste liquor through bipolar membrane electrodialysis way

A technology of bipolar membrane electrodialysis and sodium sulfate waste liquid, applied to chemical instruments and methods, sulfur compounds, alkali metal hydroxides, etc., to achieve the effects of improving yield and quality, reducing damage, and increasing service life

Active Publication Date: 2014-07-02
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 provides a viscose fiber sodium sulfate waste liquid The method of using bipolar membrane electrodialysis to recover acid and alkali is only aimed at the process of producing acid and alkali from the waste liquid produced in the process of forming viscose fiber filaments through bipolar membrane electrodialysis. A specific recovery method is adopted to recover The pretreatment step in the method handles the waste liquid produced in the viscose fiber strand molding process, and then enters the bipolar membrane electrodialysis process, which improves the regeneration recovery rate of acid and alkali in the viscose fiber waste liquid, reduces the The damage caused by waste liquid impurities to the bipolar membrane can 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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A kind of viscose fiber sodium sulfate waste liquid adopts the method for reclaiming acid-base by bipolar membrane electrodialysis method, comprises the following steps successively: crystallization, adjust pH, 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 sodi...

Embodiment 2

[0057] A kind of viscose fiber sodium sulfate waste liquid adopts the method for reclaiming acid-base by bipolar membrane electrodialysis method, comprises the following steps successively: crystallization, adjust pH, 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;

[0058] 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;

[0059] 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...

Embodiment 3

[0078] A kind of viscose fiber sodium sulfate waste liquid adopts the method for reclaiming acid-base by bipolar membrane electrodialysis method, comprises the following steps successively: crystallization, adjust pH, 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;

[0079] 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;

[0080] 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 solutio...

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Abstract

The invention discloses a method for recovering acid and alkali from viscose sodium sulfate waste liquor through a bipolar membrane electrodialysis way. The method is characterized by sequentially comprising the following steps of: crystallizing; adjusting pH (Potential of Hydrogen); initially filtering at the first time; oxidizing reducing substances through O3; initially filtering at the second time; removing organic substances through activated carbon; removing zinc ions through ion exchange resin; filtering and performing refined filtration through pp micropores; preparing acid and alkali; and concentrating. By adopting the method, the regenerative recovery rate of the acid and alkali in the viscose sodium sulfate waste liquor is increased, and the damage of impurities in the waste liquor to a bipolar membrane is reduced, so that the service life of the bipolar membrane is prolonged, and the bipolar membrane electrodialysis and subsequent processes can be able to be carried out smoothly; in addition, sodium hydroxide crystals of which the alkali concentration is controlled to 96%, 98% and 99% can be obtained, which can be directly marketed, thus the benefit is brought.

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 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 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 that...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C01B17/74C01D1/04
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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