Chemistry: electrical and wave energy – Processes and products
Patent
1974-10-09
1976-04-06
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
204128, C25B 116, C25B 126, C25B 1308
Patent
active
039487377
ABSTRACT:
In the electrolysis of an alkali metal chloride brine in an electrolytic cell equipped with a permselective ion exchange membrane between the anode and cathode, which membrane is of the perfluorinated sulfonic acid type, improved anode and cathode current efficiencies are obtained with lower power consumption by introducing the aqueous alkali metal chloride solution into the anode compartment at an alkali metal chloride content of at least 250 grams per liter and a pH which is not in excess of about 4.5, which pH is maintained by the addition of hydrochloric acid to the alkali metal chloride solution, and controlling the rate of flow of the solution through the anode compartments such that the alkali metal chloride content of the solution removed from the anode compartment is at least 25 grams per liter less than that of the solution introduced into the compartment. The alkali metal chloride content of this solution is then increased to at least 250 grams per liter by the addition of alkali metal chloride and the pH is reduced to at least 4.5 of the addition of hydrochloric acid and the solution is reintroduced into the anode compartment. Additionally, water is introduced into the cathode compartment, the rate of water addition and the rate of removal of catholyte liquor from the cathode compartment being controlled such that the alkali metal hydroxide content of the catholyte liquor removed is not in excess of about 33% by weight.
REFERENCES:
patent: 3773634 (1973-11-01), Stacey et al.
Cook, Jr. Edward H.
Emery Alvin T.
Schoepfle Blaine O.
Andrews R. L.
Casella Peter F.
Hooker Chemicals & Plastics Corporation
Mylius Herbert W.
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