Method for conditioning carboxylate/sulfonate composite membrane

Details Method for conditioning carboxylate/sulfonate composite membrane Method for conditioning carboxylate/sulfonate composite membrane

1982-03-01

1984-02-28

Hearn, Brian E.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204128, 204 98, C25B 1308, C25C 704

Patent

active

044340419

ABSTRACT:
A procedure for conditioning new composite laminated membranes in chlor-alkali cells producing KOH, said membrane being comprised of a laminated composite made from individual perfluorosulfonyl and perfluorocarboxylic acid layers, so that said membrane will not delaminate during startup operation of the cell. The procedure comprises charging the cathode compartment of the cell with a KOH solution of less than about 27 percent by weight KOH before startup and gradually raising the KOH concentration during the first 12 to about 20 hours of operation to about 30 percent after which the cell can be operated at higher KOH concentrations which provide better current efficiencies.

REFERENCES:
patent: 4176215 (1979-11-01), Molnar et al.
patent: 4253923 (1981-03-01), Lynch et al.
patent: 4255240 (1981-03-01), Molnar et al.
patent: 4332665 (1982-06-01), Kimoto et al.
patent: 4360412 (1982-11-01), Maloney

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