Method of electrolytically producing a purified alkali metal hyd

Details Method of electrolytically producing a purified alkali metal hyd Method of electrolytically producing a purified alkali metal hyd

1977-12-27

1979-03-27

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204128, C25B 120, C25B 126

Patent

active

041464451

ABSTRACT:
A method for electrolytically producing a purified alkali metal hydroxide solution by electrolyzing an alkali halide solution in a membrane cell is described. The membrane cell includes at least one buffer compartment separating an anolyte and a catholyte compartment. The barrier separating the anolyte and the buffer compartment is a porous or permeable membrane. The membrane separating the catholyte compartment and the buffer compartment is a cation-active, hydrocarbon, preferably non-porous, membrane. A minor amount of a compound selected from the group consisting of alkali metal sulfites, bisulfites, sulfides, oxalates, or mixtures thereof, is added to the electrolyte, preferably with the brine feed, to protect the membranes from hypohalites formed in the cell. Amounts of protective compounds between about 0.01 and about 2.0 percent by weight of electrolyte are found to be aptly suited to use.

REFERENCES:
patent: 3878072 (1975-04-01), Cook et al.
patent: 3959095 (1976-05-01), Marks et al.

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