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Novel process for recycling acid and base from viscose sodium sulfate waste liquid by using a bipolar membrane electrodialysis method

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

Inactive Publication Date: 2013-10-09
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 process 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 filaments through bipolar membrane electrodialysis. A specific recovery method is adopted. 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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Examples

Experimental program
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Effect test

Embodiment 1

[0037] A new process for recovering acid and alkali from viscose fiber sodium sulfate waste liquid through 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 organic matter, ion exchange resin to remove zinc ions, pp microporous filtration and fine filtration, acid and alkali preparation and concentration;

[0038] 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;

[0039] 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 sulfate ...

Embodiment 2

[0059]A new process for recovering acid and alkali from viscose fiber sodium sulfate waste liquid through 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 organic matter, ion exchange resin to remove zinc ions, pp microporous filtration and fine filtration, acid and alkali preparation and concentration;

[0060] 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;

[0061] 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 be The...

Embodiment 3

[0081] A new process for recovering acid and alkali from viscose fiber sodium sulfate waste liquid through 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 organic matter, ion exchange resin to remove zinc ions, pp microporous filtration and fine filtration, acid and alkali preparation and concentration;

[0082] 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;

[0083] 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 be T...

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Abstract

The invention discloses a novel process for recycling acid and base from viscose sodium sulfate waste liquid by using a bipolar membrane electrodialysis method. The novel process is characterized by sequentially comprising the following steps of crystallizing, regulating pH, carrying out primary prefiltration, oxidizing reducing substances by utilizing O3, carrying out secondary prefiltration, removing organic matters by utilizing activated carbon, removing zinc ions by utilizing ion exchange resin, carrying out filtering and refined filtration by utilizing pp (polypropylene) micropores, and preparing and concentrating the acid and the base. According to the novel process, the recycling rates of the acid and the base in the viscose waste liquid are improved, the damage of a bipolar membrane caused by impurities of the waste liquid is reduced, the service life of the bipolar membrane is prolonged, and the smooth operation of bipolar membrane electrodialysis and subsequent processes can be guaranteed.

Description

technical field [0001] The invention relates to a material treatment method in chemical production. More specifically, the invention relates to a new process 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 proc...

Claims

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Application Information

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IPC IPC(8): B01D61/44
Inventor 邓传东易家祥朱小川胡小东李殿洪王云
Owner 宜宾海翔化工有限责任公司
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