Electrochemical process for producing hydrosulfite solutions

Details Electrochemical process for producing hydrosulfite solutions Electrochemical process for producing hydrosulfite solutions

1986-08-04

1988-12-27

Tung, T.

Chemistry: electrical and wave energy

Processes and products

204263, C25B 114

Patent

active

047939060

ABSTRACT:
A process for the electrochemical production of an alkali metal hydrosulfite by the reduction of an alkali metal bisulfite component of a circulated aqueous catholyte solution in an electrolytic membrane cell having a cathode compartment, a porous cathode in the cathode compartment, an anode compartment and a cation exchange membrane separating the cathode compartment from the anode compartment, which comprises passing at least 30 percent by volume of the aqueous catholyte through the pores of the porous cathode in the cathode compartment.
High purity solutions of alkali metal hydrosulfites, such as sodium hydrosulfite having concentrations of at least 120 grams per liter, are produced at current densities in the range of 1.0 to 4.5 KA/m.sup.2 and at reduced cell voltages. The thiosulfate impurity concentration is from 0 to about 10 percent by weight of the hydrosulfite.

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Olomon, C., "The Preparation of Dithionites by the Electrolytic Reduction of Sulfur Dioxide in Water", J. Electrochem. Soc.: Electrochemical Technology, Dec. 1970, pp. 1604-1609.
Kovacs, L., S. Muthukumaraswami, S. Krishnamurthy, R. Thangappan & H. V. K. Upuda, "Electrochemical Reduction of Sodium Bisulphite to Sodium Hydrosulphite in a Fluidized Bed Electrode", Journal of Indian Technology, vol. 14, Apr., 1976, pp. 184-188.
Gizetdinova, N. A., "Electrochemical Synthesis of Sodium Dithionite", Siberian Scientific-Research Institute of Paper and Cardboard, Translated from Zhurnal Prikladnoi Khimii, vol. 52, No. 12, pp. 2741-2744, Dec., 1979. Original article submitted Aug. 7, 1978.

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