Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1975-12-31
1977-05-17
Edmundson, F.C.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204180P, C25B 1308
Patent
active
040240436
ABSTRACT:
Novel single film bipolar membranes, of substantially improved efficiency and durability, i.e. having an ion selectivity above 80% in an electrolyte medium of about one mole, are prepared from pre-swollen films containing a relatively high amount, i.e. at least 15% of an insoluble cross-linked aromatic polymer. Under controlled conditions, high dissociable cationic-exchange groups are chemically bonded to the aromatic nuclei to a desired depth of the film from one side only; subsequently, highly dissociable anion-exchange groups are chemically bonded to the unreacted aromatic nuclei on the other side of the film. The functionalized, densely structured single film ion exchange membrane undergoes negligible degradation, is blister free, and is uniquely suited for electrodialysis particularly water-splitting operations due to its low electrical resistance and low salt leakage. The membrane operates with improved current efficiencies at both high electrolyte concentrations and high current densities, for time periods not previously achievable.
REFERENCES:
patent: 3510418 (1970-05-01), Mizutani et al.
patent: 3562139 (1971-02-01), Leitz
patent: 3657104 (1972-04-01), Hodgdon
patent: 3868314 (1975-02-01), Mizutani et al.
Dege Gerald J.
Liu Kang-Jen
Allied Chemical Corporation
Edmundson F.C.
Plantamura Arthur J.
Polin Ernest A.
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