Unlock instant, AI-driven research and patent intelligence for your innovation.

Viscose sodium sulfate waste liquor acid and alkali recycling technology by virtue of bipolar membrane electrodialysis method

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

Inactive Publication Date: 2013-10-09
宜宾海翔化工有限责任公司 +2
View PDF4 Cites 7 Cited by
  • 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 process of recycling 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The process of reclaiming acid and alkali from viscose fiber sodium sulfate waste liquid through bipolar membrane electrodialysis includes 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 solut...

Embodiment 2

[0059] The process of reclaiming acid and alkali from viscose fiber sodium sulfate waste liquid through bipolar membrane electrodialysis includes the following steps in turn: crystallization, pH adjustment, primary filtration, O 3Redox 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 maxi...

Embodiment 3

[0081] The process of reclaiming acid and alkali from viscose fiber sodium sulfate waste liquid through bipolar membrane electrodialysis includes 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 The ma...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a viscose sodium sulfate waste liquor acid and alkali recycling technology by virtue of a bipolar membrane electrodialysis method. The technology is characterized by comprising the following steps in sequence of: crystallization, pH adjustment, a first primary filtration, oxidation of reducing substances with O3, a secondary primary filtration, removal of organics by activated carbon, removal of zinc ions by ion exchange resin, refined filtration by a pp millipore filter, and preparation and concentration of acid-base. The technology disclosed by the invention improves the regeneration recovery rate of acid and base in viscose waste liquor, alleviates harm to a bipolar membrane caused by waste liquor impurities, prolongs the service life of the bipolar membrane, and guarantees the smooth operation of bipolar membrane electrodialysis and subsequent procedures.

Description

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

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01D61/44
Inventor 邓传东易家祥朱小川胡小东李殿洪廖廷高
Owner 宜宾海翔化工有限责任公司