Production of halogens by electrolysis of alkali metal halides i

Details Production of halogens by electrolysis of alkali metal halides i Production of halogens by electrolysis of alkali metal halides i

1978-08-07

1980-06-24

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204128, 204283, 204296, C25B 134, C25B 904, C25B 1308, C25B 1108

Patent

active

042093686

ABSTRACT:
A halogen, such as chlorine, is generated in an electrolysis cell in which at least one of the cell electrodes is bonded to the surface of a solid but porous membrane which separates the cell into anode and cathode chambers. A pressurized aqueous metal halide such as brine is electrolyzed at the anode to produce chlorine. Brine anolyte and sodium ions are hydraulically transported across the porous membrane to produce caustic (NaOH) at the cathode. By bonding at least one gas permeable, porous electrode to the hydraulically permeable membrane, the cell voltage for electrolysis of brine is considerably lower than that required for asbestos diaphragm cells, while achieving high cathodic current efficiencies by minimizing back migration of caustic to the anode.

REFERENCES:
patent: 3222265 (1965-12-01), Beer
patent: 3853720 (1974-12-01), Korach et al.
patent: 4032427 (1977-06-01), Kadija
patent: 4120772 (1978-10-01), Kadija

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