Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Ion exchange membrane, method for producing ion exchange membrane and electrolyzer

Pending Publication Date: 2020-12-17
ASAHI KASEI KK
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides an ion exchange membrane, a method for producing it, and an electrolyzer that can decrease the voltage needed for electrolysis and have minimal impact on impurities in the electrolyte, resulting in stable and efficient electrolysis.

Problems solved by technology

These impurities, if accumulate inside the cation exchange membrane, may cause an increase in the electrolytic voltage, a reduction in the current efficiency, and an increase in the concentration of the impurities in the alkali.
Particularly, unlike cation impurities such as Ca and Mg, I is an impurity difficult to reduce even if the electrolyte is treated in advance.

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Ion exchange membrane, method for producing ion exchange membrane and electrolyzer
  • Ion exchange membrane, method for producing ion exchange membrane and electrolyzer

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0140]As reinforcement yarn, a yarn-like material prepared by twisting 100-denier tape yarn made of polytetrafluoroethylene (PTFE) at 900 turns / m (hereinafter, referred to as PTFE yarn) was used. As warp sacrifice yarn, yarn prepared by twisting polyethylene terephthalate (PET) of 35 deniers and 8 filaments at 200 turns / m (hereinafter, referred to as PET yarn) was used. As weft sacrifice yarn, yarn prepared by twisting polyethylene terephthalate (PET) of 35 deniers and 8 filaments at 200 turns / m (hereinafter, referred to as PET yarn) was used. First, plain-weaving was carried out with the PTFE yarn arranged at 24 strands / inch and two strands of the sacrifice yarn arranged between adjacent strands of the PTFE yarns to thereby obtain woven fabric having a thickness of 100 μm.

[0141]Then, provided were a polymer (A1) as a dried resin, which was a copolymer of CF2═CF2 and CF2═CFOCF2CF(CF3)OCF2CF2COOCH3 and had an ion exchange capacity of 0.85 mg equivalent / g and a polymer (B1) as a dried...

example 2

[0148]An ion exchange membrane was prepared in the same manner as in Example 1 except that the amount of HS-210 used was reduced and the viscosity was changed to 12.0 mPa-s in Example 1. In this ion exchange membrane, the content of the fluorine-containing polymer in the binder was 100% by mass.

[0149]The distribution density was measured in the same manner as in Example 1, and the result was 0.5 mg per 1 cm2. The coverage was measured in the same manner as in Example 1, and the result was 56.5%.

[Electrolysis Evaluation]

[0150]As a result of electrolysis performance evaluation on this ion exchange membrane under the same conditions as in Example 1, the voltage indicated was as low as 3.08 V. As a result of test on resistance to impurities, the decrease in the current efficiency was as low as 0.741 / day, and high durability to impurities was indicated.

example 3

[0151]An ion exchange membrane was prepared in the same manner as in Example 1 except that the amount of HS-210 used was raised and the viscosity was changed to 8.5 mPa-s in Example 1. In this ion exchange membrane, the content of the fluorine-containing polymer in the binder was 100 h by mass.

[0152]The distribution density was measured in the same manner as in Example 1, and the result was 0.5 mg per 1 cm2. The coverage was measured in the same manner as in Example 1, and the result was 92.9.

[Electrolysis Evaluation]

[0153]As a result of electrolysis performance evaluation on this ion exchange membrane under the same conditions as in Example 1, the voltage indicated was as low as 3.06 V. As a result of test on resistance to impurities, the decrease in the current efficiency was as low as 0.42% / day, and high durability to impurities was indicated.

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

No PUM Login to View More

Abstract

An ion exchange membrane, a method for producing an ion exchange membrane, and an electrolyzer that enable a reduction in the electrolytic voltage when subjected to electrolysis are provided which have small influence of impurities in the electrolyte on electrolysis performance, and exert stable electrolysis performance. An ion exchange membrane includes a membrane main body containing a fluorine-containing polymer having an ion exchange group; and a coating layer arranged on at least one face of the membrane main body. The coating layer includes inorganic particles and a binder, a mass ratio of the binder to the total mass of the inorganic particles and the binder in the coating layer is 0.3 or more and 0.9 or less, and a coverage of the membrane main body with the coating layer is 50% or more.

Description

TECHNICAL FIELD[0001]The present invention relates to an ion exchange membrane, a method for producing an ion exchange membrane, and an electrolyzer.BACKGROUND ART[0002]Fluorine-containing ion exchange membranes, which have excellent heat resistance and chemical resistance, are used as electrolytic diaphragms for alkali chloride electrolysis, ozone generation electrolysis, fuel cells, water electrolysis, and hydrochloric acid electrolysis in various applications, further extending to new applications.[0003]Of these, in alkali chloride electrolysis for producing chlorine and alkali hydroxide, ion exchange membrane process has been predominant recently. Additionally, in order to reduce the electric power consumption rate, natural-circulation zero-gap base electrolyzers including an ion exchange membrane, an anode, and a cathode in close contact one another have become predominant for alkali chloride electrolysis by ion exchange membrane process.[0004]For ion exchange membranes used in...

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): C25B13/08C25B1/46C25B9/10C25B13/02C25B9/23
CPCC25B13/02C25B9/10C25B1/46C25B13/08B05D7/24C25B9/23
Inventor KOTAKI, YUTAKAIHARA, SHINICHIOKAMOTO, KOJIIGARASHI, YUTA
Owner ASAHI KASEI KK
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com