Method of producing sodium dithionite by electrochemical means

Details Method of producing sodium dithionite by electrochemical means Method of producing sodium dithionite by electrochemical means

1991-03-13

1992-06-30

Tung, T.

Chemistry: electrical and wave energy

Processes and products

204 82, 204294, C25B 114, C25B 128

Patent

active

051260182

ABSTRACT:
A method of producing sodium dithionite comprising electrolyzing a catholyte solution of sulfur dioxide in an electrolytic cell at a pH of at least about 3, the electrolytic cell having a carbonaceous cathode, is disclosed. Particularly high current efficiencies can be attained using a high surface area carbon material for the cathode. The use of a stabilizer to inhibit decomposition of the sodium dithionite to form sodium thiosulfate is also disclosed. The stabilizer is added to the catholyte and is selected from the group consisting of phosphoric acid, sodium tripolyphosphate, acid phosphates and mixtures thereof.

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