(19) |
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(11) |
EP 4 411 026 A3 |
(12) |
EUROPEAN PATENT APPLICATION |
(88) |
Date of publication A3: |
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23.10.2024 Bulletin 2024/43 |
(43) |
Date of publication A2: |
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07.08.2024 Bulletin 2024/32 |
(22) |
Date of filing: 13.02.2020 |
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(51) |
International Patent Classification (IPC):
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(84) |
Designated Contracting States: |
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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
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(62) |
Application number of the earlier application in accordance with Art. 76 EPC: |
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20713433.9 / 3924537 |
(71) |
Applicant: The Chemours Company FC, LLC |
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Wilmington, Delaware 19801 (US) |
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(72) |
Inventors: |
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- 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)
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(74) |
Representative: Abitz & Partner |
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Postfach 86 01 09 81628 München 81628 München (DE) |
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(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.