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

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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 throu

Method used

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Examples

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Example Embodiment

[0036] Example 1

[0037] The new process of recovering acid and alkali from viscose fiber sodium sulfate waste liquid by bipolar membrane electrodialysis method includes the following steps in sequence: 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-base preparation and concentration;

[0038] Said crystallization is the process of forming sodium sulfate crystals from waste liquid with a sodium sulfate content of 200 g / L generated in the process of forming viscose fiber strands through high-temperature crystallization;

[0039] The pH adjustment is to first dissolve sodium sulfate crystals with demineralized water to obtain a sodium sulfate solution with a concentration of 3%, and then add sodium carbonate to the sodium sulfate solution to adjust the pH of the solution to 8, and add sodium carbo...

Example Embodiment

[0058] Example 2

[0059] The new process of recovering acid and alkali from viscose fiber sodium sulfate waste liquid by bipolar membrane electrodialysis method includes the following steps in sequence: 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-base preparation and concentration;

[0060] The crystallization is the process of forming sodium sulfate crystals from waste liquid with a sodium sulfate content of 300 g / L generated in the process of forming viscose fiber strands through high-temperature crystallization;

[0061] The 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 to adjust the pH value of the solution to 9, and add sodium carb...

Example Embodiment

[0080] Example 3

[0081] The new process of recovering acid and alkali from viscose fiber sodium sulfate waste liquid by bipolar membrane electrodialysis method includes the following steps in sequence: 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-base preparation and concentration;

[0082] The crystallization is the process of forming sodium sulfate crystals from waste liquid with a sodium sulfate content of 300 g / L generated in the process of forming viscose fiber strands through high-temperature crystallization;

[0083] The pH adjustment is to first dissolve sodium sulfate crystals with demineralized water to obtain a sodium sulfate solution with a concentration of 12%, and then add sodium carbonate to the sodium sulfate solution to adjust the pH value of the solution to 9, adding sodium ...

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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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