(19)
(11) EP 4 411 026 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
23.10.2024 Bulletin 2024/43

(43) Date of publication A2:
07.08.2024 Bulletin 2024/32

(21) Application number: 24169897.6

(22) Date of filing: 13.02.2020
(51) International Patent Classification (IPC): 
C25B 1/46(2006.01)
C25B 13/08(2006.01)
C25B 9/19(2021.01)
H01M 8/1053(2016.01)
(52) Cooperative Patent Classification (CPC):
C25B 1/46; C25B 13/08; C25B 9/19
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30) Priority: 14.02.2019 US 201962805333 P

(62) Application number of the earlier application in accordance with Art. 76 EPC:
20713433.9 / 3924537

(71) Applicant: The Chemours Company FC, LLC
Wilmington, Delaware 19801 (US)

(72) Inventors:
  • PERRY, Randal L.
    Hockessin (US)
  • UNLU, Murat
    Newark (US)
  • BRADY, Jack Christopher
    Fayetteville (US)
  • EWART, Douglas Glenn
    Hope Mills (US)
  • HOPKINS, Timothy Edward
    Newark (US)
  • LLOYD, Ralph Birchard
    Fayetteville (US)
  • MCKEEVER, Mark Robert
    Mooresville (US)

(74) Representative: Abitz & Partner 
Postfach 86 01 09
81628 München
81628 München (DE)

   


(54) MULTILAYER CATION EXCHANGE CHLORALKALI MEMBRANE


(57) A multilayer cation exchange membrane for use in a chloralkali process comprising an carboxylate layer comprising a fluorinated ionomer containing carboxylate groups on one side of the membrane, an exterior sulfonate layer comprising a fluorinated ionomer containing sulfonate groups on the side of the membrane opposite the carboxylate layer, and an interior sulfonate layer comprising a fluorinated ionomer containing sulfonate groups between the carboxylate layer and the exterior sulfonate layer, the exterior sulfonate layer having an ion exchange ratio greater than about 11.3, and the interior sulfonate layer having an ion exchange ratio less than about 11.





Search report









Search report