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Pretreatment method for preparing acid/base from viscose fiber sodium sulfate waste liquid by using bipolar membrane electrodialysis method

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

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 waste liquid produced in the process of forming viscose fiber strands, and provides a bipolar membrane electrodialysis method from The pretreatment method for producing acid-base from viscose fiber sodium sulfate waste liquid is only aimed at the process of producing acid-base from waste liquid produced in the process of forming viscose fiber strands through bipolar membrane electrodialysis. The treatment method is used in the acid-base recovery method as a pretreatment step to treat the waste liquid generated in the viscose fiber filament molding process, and then enters the bipolar membrane electrodialysis process, which improves the acidity in the viscose fiber waste liquid. The regeneration recovery rate of alkali and alkali reduces the damage caused by waste liquid impurities to the bipolar membrane, improves 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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Effect test

Embodiment 1

[0039] A bipolar membrane electrodialysis method produces acid-base pretreatment method from viscose fiber sodium sulfate waste liquid, it is characterized in that comprising 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 and pp microporous filtration for fine filtration.

[0040] 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;

[0041] 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 solution in the ...

Embodiment 2

[0063]A bipolar membrane electrodialysis method produces acid-base pretreatment method from viscose fiber sodium sulfate waste liquid, it is characterized in that comprising 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 and pp microporous filtration for fine filtration.

[0064] 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;

[0065] The pH adjustment is to first dissolve sodium sulfate crystals with desalinated water to obtain a sodium sulfate solution with a concentration of 10%, then add sodium carbonate to the sodium sulfate solution, adjust the pH value of the solution to 9, and add sodium carbonate to dissolve the sodium sulfate solution in the ...

Embodiment 3

[0078] A bipolar membrane electrodialysis method produces acid-base pretreatment method from viscose fiber sodium sulfate waste liquid, it is characterized in that comprising 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 and pp microporous filtration for fine filtration.

[0079] Described crystallization is that the waste liquid that sodium sulfate content is 400g / L is generated sodium sulfate crystal through high-temperature crystallization by viscose fiber strand forming process;

[0080] The pH adjustment is to first dissolve sodium sulfate crystals with desalinated water to obtain a sodium sulfate solution with a concentration of 10%, then add sodium carbonate to the sodium sulfate solution, adjust the pH value of the solution to 10, and add sodium carbonate to dissolve the sodium sulfate solution in th...

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Abstract

The invention discloses a pretreatment method for preparing acid / base from viscose fiber sodium sulfate waste liquid by using a bipolar membrane electrodialysis method. The pretreatment method sequentially comprises the following steps of crystallizing, adjusting pH, carrying out primary rough filtering, oxidizing the reducing substances by using O3, carrying out secondary rough filtering, removing organic substances by using activated carbon, removing zinc ions by using ion exchange resin, and carrying out fine filtering by using a pp microporous filter. The pretreatment method has the advantages that the regeneration recovery ratio of the acid and base in the viscose fiber waste liquid is increased, the damage to bipolar membranes caused by impurities in the waste liquid is reduced, the service lives of the bipolar membranes are prolonged, and the smooth operation of bipolar membrane electrodialysis and subsequent processes is guaranteed.

Description

technical field [0001] The invention relates to a method for material treatment in chemical production, more specifically, the invention relates to a pretreatment method for preparing acid and alkali from viscose fiber sodium sulfate waste liquid by bipolar membrane electrodialysis, which belongs to viscose fiber field of production technology. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/44C01D5/16
Inventor 易家祥邓传东胡小东朱小川李殿洪夏崇胜杜金江卢伟
Owner 宜宾海翔化工有限责任公司
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