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Method and device for refining brine applied to chlorine alkali industry

A technology for brine refining and chlor-alkali industry, which is applied in the field of chlor-alkali industry and can solve problems such as the impact of electrolysis efficiency

Active Publication Date: 2016-10-26
JIANGSU JIUWU HITECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to propose a technical solution for pre-treatment of brine, mainly through decalcification and magnesium removal, in view of the problem that the electrolysis efficiency is affected when the brine containing organic pollutants is operated by ion-exchange membrane electrolysis. Nanofiltration treatment of brine can effectively remove organic matter in water and improve the efficiency of ion membrane electrolysis

Method used

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  • Method and device for refining brine applied to chlorine alkali industry

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Add NaOH 0.8g / L and NaOH to the brine 2 CO 3 1.8g / L, after fully reacting in the reactor, the Ca 2+ , Mg 2+ into CaCO 3 and Mg(OH) 2, and then enter the ceramic membrane for filtration, and continuously add sodium hypochlorite (effective free chlorine 15mg / L) online, using an alumina ceramic membrane with an average pore size of 200nm, 7 channels, channel inner diameter 4mm, cross-flow velocity 4m / s, operating pressure 0.4MPa, can remove CaCO 3 Precipitation and Mg(OH) 2 Colloid, the ion content in the obtained ceramic membrane permeate is: magnesium ion content 44.74 mg / L, calcium ion content 42.8 mg / L, sulfate content 6.72g / L. The brine after dechlorination treatment is sent to the polyamide nanofiltration membrane with a molecular weight cut-off of 150Da for filtration treatment, the operating pressure is 3.5Mpa, the temperature is 30°C, the concentration factor is 3 times, and Ca 2+ , Mg 2+ , SO 4 2- , COD interception rates were 86.9%, 85.9%, 96.5%, 68....

Embodiment 2

[0069] Add NaOH 0.6g / L and NaOH to the brine 2 CO 3 1.7g / L, after fully reacting in the reactor, the Ca 2+ , Mg 2+ into CaCO 3 and Mg(OH) 2 , and then enter the ceramic membrane for filtration, and continuously add sodium hypochlorite (effective free chlorine 15mg / L) online, using a zirconia ceramic membrane with an average pore diameter of 50nm, 19 channels, channel inner diameter 4mm, cross-flow velocity 3m / s, operating pressure 0.3MPa, can remove CaCO 3 Precipitation and Mg(OH) 2 Colloid, the ion content in the obtained ceramic membrane permeate is: magnesium ion content 34.94 mg / L, calcium ion content 32.1 mg / L, sulfate content 8.32g / L. The brine after dechlorination treatment is then sent to the polyamide nanofiltration membrane with a molecular weight cut-off of 200Da for filtration treatment, the operating pressure is 4.0Mpa, the temperature is 35°C, the concentration factor is 3 times, and Ca 2+ , Mg 2+ , SO 4 2- , COD interception rates were 87.5%, 87.1%, ...

Embodiment 3

[0071] Add NaOH 0.9g / L and NaOH to the brine 2 CO 3 2.2g / L, after fully reacting in the reactor, Ca 2+ , Mg 2+ into CaCO 3 and Mg(OH) 2 , and then enter the ceramic membrane for filtration, while continuously adding sodium hypochlorite (effective free chlorine 15mg / L) online, using a zirconia ceramic membrane with an average pore diameter of 50nm, 19 channels, channel inner diameter 4mm, cross-flow velocity 5m / s, operating pressure 0.4MPa, can remove CaCO 3 Precipitation and Mg(OH) 2 Colloid, the ion content in the obtained ceramic membrane permeate is: magnesium ion content 36.11 mg / L, calcium ion content 35.3 mg / L, sulfate content 7.72g / L. The brine after dechlorination treatment is sent to the polyamide nanofiltration membrane with a molecular weight cut-off of 150Da for filtration treatment, the operating pressure is 3.0Mpa, the temperature is 35°C, the concentration factor is 3 times, and Ca 2+ , Mg 2+ , SO 4 2- , COD interception rates were 85.3%, 85.1%, 96.2...

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Abstract

The invention relates to a method and a device for refining brine applied to the chlorine alkali industry, and belongs to the technical field of the chlorine alkali industry. The method includes steps of firstly, carrying out impurity removal cationic treatment on the brine; secondly, filtering the treated brine by the aid of nano-filtration membranes to obtain refined brine. The brine contains organic pollutants. The method and the device for refining the brine have the advantage that the problem of low electrolytic efficiency of ionic membranes due to brine with organic pollutants in the chlorine alkali industry can be effectively solved by the aid of the method and the device.

Description

technical field [0001] The invention relates to a brine refining method and device applied in the chlor-alkali industry, belonging to the technical field of the chlor-alkali industry. Background technique [0002] In the chlor-alkali industry, cation exchange membrane electrolyzers are used to electrolyze salt or potassium chloride aqueous solution to produce chlorine, hydrogen and high-purity caustic soda (sodium hydroxide) or potassium hydroxide. In the production process, the mined brine or brine after desalination is generally used as raw materials. In order to protect the operation of the ion membrane device, the Ca which has an effect on the ion membrane will be removed in advance. 2+ , Mg 2+ However, due to the presence of organic pollutants in the brine after mining or coarse salinization, it is easy to affect the electrolysis process of the ion membrane and the efficiency is low. Contents of the invention [0003] The purpose of the present invention is to p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/14C01D3/16
CPCC01D3/14C01D3/16
Inventor 彭文博邓唯陈留平赵营峰王肖虎杨文银丁邦超范克银
Owner JIANGSU JIUWU HITECH