Title:
PRODUCTION METHOD FOR ION EXCHANGE MEMBRANE FOR ALKALI CHLORIDE ELECTROLYSIS AND PRODUCTION METHOD FOR ALKALI CHLORIDE ELECTROLYSIS DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/043590
Kind Code:
A1
Abstract:
Provided is a production method whereby an ion exchange membrane for alkali chloride electrolysis can be obtained that has high current efficiency, little variation in current efficiency, and high alkaline resistance. This method produces an ion exchange membrane 1 having a layer (C) 12 including a fluorine-containing polymer (A) having carboxylic acid functional groups, by: immersing an ion exchange membrane precursor membrane in an aqueous alkaline solution including an alkali metal hydroxide, a water-soluble organic solvent, and water, said ion exchange membrane precursor membrane having a precursor layer (C') including a fluorine-containing polymer (A') having carboxylic acid functional group-substitutable groups; and substituting the carboxylic acid functional group-substitutable groups with carboxylic acid functional groups. The water-soluble organic solvent concentration is 1%-60% by mass in the aqueous alkaline solution (100% by mass); the temperature of the aqueous alkaline solution is at least 40°C and less than 80°C; and the proportion of structural units having carboxylic acid functional groups in the fluorine-containing polymer (A) is 13.10-14.50 mol% of all structural units (100 mol%) in the fluorine-containing polymer (A).
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Inventors:
SOGA TAMAKI (JP)
NISHIO TAKUO (JP)
YAMAKI YASUSHI (JP)
KANEKO TAKAYUKI (JP)
NISHIO TAKUO (JP)
YAMAKI YASUSHI (JP)
KANEKO TAKAYUKI (JP)
Application Number:
PCT/JP2016/076487
Publication Date:
March 16, 2017
Filing Date:
September 08, 2016
Export Citation:
Assignee:
ASAHI GLASS CO LTD (JP)
International Classes:
C25B9/17; C25B13/08; C08J5/22; C25B1/46; C25B9/19
Foreign References:
| JPS58181883A | 1983-10-24 | |||
| JPH05112886A | 1993-05-07 |
Other References:
See also references of EP 3348673A4
Attorney, Agent or Firm:
SENMYO, Kenji et al. (JP)
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