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

1983-12-23

1986-02-11

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204128, 204283, C25B 134

Patent

active

045697353

ABSTRACT:
A halogen, such as chlorine, is generated by electrolysis of an aqueous solution of an alkali metal halide such as sodium chloride, in a cell having anolyte and catholyte chambers separated by a solid polymer electrolyte in the form of a stable, selectively cation permeable, ion exchange membrane. One or more catalytic electrodes including at least one thermally stabilized, reduced oxide of a platinum group metal are bonded to the surface of the membrane. An aqueous brine solution is brought into contact with the anode and water or an aqueous NaOH solution is brought into contact with the cathode. The brine is electrolyzed to produce chlorine at the anode and hydrogen and caustic at the cathode. The cell membrane preferably has an anion rejecting cathode side barrier layer which rejects hydroxyl ions to block back migration of caustic to the anode thereby enhancing the cathode current efficiency of the cell and of the process.

REFERENCES:
patent: 3242059 (1966-03-01), Cottam et al.
patent: 4090931 (1978-05-01), Motani et al.
patent: 4177116 (1979-12-01), De Nora et al.

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