Electrolysis of alkali metal sulfates

Details Electrolysis of alkali metal sulfates Electrolysis of alkali metal sulfates

1991-03-20

1993-11-02

Niebling, John

Chemistry: electrical and wave energy

Processes and products

204104, 2041824, 204296, C25B 100, B01D 6144

Patent

active

052581063

ABSTRACT:
Alkali metal sulfates are electrolyzed to more concentrated solutions of alkali metal hydroxide and sulfuric acid by using a three-compartment electrodialysis cell at temperatures of .gtoreq.70.degree. to .gtoreq.150.degree. C. and current densities of from 0.5 to 15 kA/m.sup.2 using an anion exchange membrane whose polymeric ion exchange matrix comprises a styrene/divinylbenzene copolymer containing very strongly basic quaternary ammonium groups and a hydronium ion blocker, on whose central compartment side is an ion exchange layer or membrane containing tertiary or secondary amino groups.

REFERENCES:
patent: 3801698 (1974-04-01), Lowrance et al.
patent: 4075068 (1978-02-01), Loest et al.
patent: 4083768 (1978-04-01), Lee et al.
patent: 4129484 (1978-12-01), Larsson
Stender et al., "Electrolysis of Aqueous Solutions of Alkali Sulfates." Oct., 1935, pp. 109-135. The Electrochemical Society.
Chem.-Ing.-Tech. 61 (1989) No. 12 933-940.

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