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Fluorinated Ion Exchange Membranes for Alkali Metal Chloride Electrolysis

An alkali metal chloride and ion-exchange membrane technology, applied in the field of ion-exchange membranes, can solve problems such as low interlayer binding force and poor polymer compatibility, so as to overcome technical requirements, increase binding force, and increase the adjustable range Effect

Active Publication Date: 2021-05-28
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure the performance stability of the ion exchange membrane under long-term operating conditions, the previous patented technology mainly focused on reducing the internal pressure formed at the interface and slowing down the delamination by matching the water absorption difference between the two layers, but because of the nature of the material itself The problem, the poor compatibility of polymers containing fluorine-containing functional compounds containing carboxylic acid groups and fluorine-containing functional compounds containing sulfonic acid groups, and the problem of low interlayer bonding have not been resolved

Method used

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  • Fluorinated Ion Exchange Membranes for Alkali Metal Chloride Electrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Select IEC (exchange capacity) as perfluorosulfonic acid resin (CF) of 1.0mmol / g 2 = CFOCF 2 CF(CF 3 )OCF 2 CF 2 SO 2 A binary copolymer of F and tetrafluoroethylene) and a perfluorocarboxylic acid resin with an IEC of 0.9 mmol / g (CF 2 = CFOCF 2 CF(CF 3 )OCF 2 CF 2 COOCH 3 and tetrafluoroethylene binary copolymers) at a mass ratio of 5:5 at a temperature of 270°C for blending and granulation to obtain a fully mixed resin with an exchange capacity of 0.95mmol / g, in which the sulfonic acid functional group and carboxylic acid The functional group molar ratio is 10:9.

[0037] Take the perfluorosulfonic acid resin with IEC of 1.0mmol / g and the perfluorocarboxylic acid resin with IEC of 0.9mmol / g and the above-mentioned blended resins and compound them into perfluorinated ion exchange resin base membrane by melt co-extrusion casting Precursor, wherein the thickness of perfluorosulfonic acid layer (fluoropolymer layer 3 with sulfonic acid type functional groups) i...

Embodiment 2

[0050] Choose IEC as perfluorosulfonic acid resin (CF) of 1.1mmol / g 2 = CFOCF 2 CF(CF 3 )OCF 2 CF 2 SO 2 A binary copolymer of F and tetrafluoroethylene) and a perfluorocarboxylic acid resin with an IEC of 0.9 mmol / g (CF 2 = CFOCF 2 CF(CF 3 )OCF 2 CF 2 COOCH 3 and tetrafluoroethylene binary copolymers) at a mass ratio of 1:5 at a temperature of 270°C for blending and granulation to obtain a fully mixed resin with an exchange capacity of 0.93mmol / g, in which the sulfonic acid functional group and carboxylic acid The functional group molar ratio is 1:4.

[0051] Get the above-mentioned perfluorosulfonic acid resin and perfluorocarboxylic acid resin and the above-mentioned blended resin to be compounded into the precursor of the perfluoroion exchange resin base membrane by means of melt co-extrusion casting, wherein the perfluorosulfonic acid layer (with sulfonic acid The fluoropolymer layer 3) with acid type functional groups is 90 microns thick, the transition layer ...

Embodiment 3

[0057] Choose IEC as perfluorosulfonic acid resin (tetrafluoroethylene and CF) of 1.3mmol / g 2 = CFOCF 2 CF 2 SO 2 F binary copolymer) and perfluorocarboxylic acid resin (tetrafluoroethylene and CF 2 = CFOCF 2 CF(CF 3 )OCF 2 CF 2 COOCH 3 The binary copolymer) is blended and granulated at a temperature of 265 °C at a mass ratio of 5:5 to obtain a fully mixed resin whose exchange capacity is 1.1 mmol / g, wherein the molar ratio of sulfonic acid functional group to carboxylic acid functional group is 13:9.

[0058] Choose IEC as perfluorosulfonic acid resin (CF) of 1.1mmol / g 2 = CFOCF 2 CF(CF 3 )OCF 2 CF 2 SO 2 A binary copolymer of F and tetrafluoroethylene) and a perfluorocarboxylic acid resin with an IEC of 0.9 mmol / g (CF 2 = CFOCF 2 CF(CF 3 )OCF 2 CF 2 COOCH 3 and the binary copolymer of tetrafluoroethylene) and the blend obtained above are compounded into the precursor of the perfluoroion exchange resin base membrane by means of melt co-extrusion casting, w...

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Abstract

The invention belongs to the technical field of ion exchange membranes, and in particular relates to a fluorine-containing ion exchange membrane for the electrolysis of alkali metal chlorides. The fluorine-containing ion exchange membrane comprises a fluorine-containing polymer layer with carboxylic Type and carboxylic acid type functional group of fluoropolymer layer and fluoropolymer layer with sulfonic acid type functional group, wherein, in the said fluoropolymer layer with sulfonic acid type functional group embedded with reinforcing material, said The reinforcing material is arranged in parallel with the fluorine-containing polymer layer having carboxylic acid type functional groups and the fluorine-containing polymer layer containing sulfonic acid type and carboxylic acid type functional groups; the surface of the fluorine-containing ion exchange membrane has ion exchange resin and inorganic ion The surface modification coating formed together. The invention can reduce the electrolysis voltage during the electrolysis of the alkali metal chloride and suppress the defect of interlayer peeling in the application process of the multilayer composite film, and is suitable for operation in a zero-pole-distance electrolytic cell under novel high current density conditions.

Description

technical field [0001] The invention belongs to the technical field of ion exchange membranes, in particular to a fluorine-containing ion exchange membrane for electrolysis of alkali metal chlorides. Background technique [0002] Due to their excellent permselectivity, ion exchange membranes have been widely used in electrolytic oxidation and reduction operations. The application of perfluorinated ion exchange membranes in the salt electrolysis industry has caused revolutionary changes in the chlor-alkali industry. In addition, it is widely used in the electrolysis of potassium chloride to produce potassium carbonate, sodium chloride to produce sodium carbonate, sodium chloride to produce sodium sulfite, and sodium sulfate to produce caustic soda and sulfuric acid. In recent years, in order to improve production efficiency and reduce energy consumption, ion exchange membranes with more stable performance are constantly being pursued. It is expected that ion exchange membran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B13/08C25B13/02C25B1/46
CPCC25B1/46C25B13/02C25B13/08
Inventor 王丽杨淼坤滕培峰张志浩张永明
Owner SHANDONG DONGYUE POLYMER MATERIAL