Electrochemical process

Details Electrochemical process Electrochemical process

1994-06-30

1995-12-26

Niebling, John

Chemistry: electrical and wave energy

Processes and products

204 96, 204101, 204103, 204104, C25B 126, B01D 6144

Patent

active

054784468

ABSTRACT:
The invention relates to a method of producing an acidified aqueous solution containing alkali metal sulfate and chlorate comprising the steps of introducing an aqueous solution containing alkali metal sulfate and chlorate into an electrochemical cell and electrochemically increasing the acidity of said aqueous solution, wherein the current efficiency of the cell is maintained below 70%. The invention also relates to a method of producing chlorine dioxide comprising the steps: Providing a reactor with an aqueous acidic reaction medium containing alkali metal chlorate and sulfate; reducing chlorate ions in said reaction medium to form chlorine dioxide; withdrawing chlorine dioxide gas from the reaction medium; withdrawing reaction medium from the reactor and transferring it to an electrochemical cell substantially without crystallization of sulfate or chlorate; electrochemically acidifying said reaction medium to increase the acidity and to decrease the content of alkali metal ions; recycling acidified reaction medium to the reactor; adding make up alkali metal chlorate to the reaction medium before or after the electrochemical cell; wherein the current efficiency of the electrochemical cell is maintained below about 80%.

REFERENCES:
patent: 2332181 (1943-10-01), Soule
patent: 2833624 (1958-05-01), Sprauer
patent: 3341288 (1967-09-01), Partridge et al.
patent: 3563702 (1971-02-01), Partridge et al.
patent: 3760065 (1973-09-01), Rapson
patent: 3810969 (1974-05-01), Schlumberger
patent: 4081520 (1978-03-01), Swindells et al.
patent: 4129484 (1978-12-01), Larsson
patent: 4325934 (1982-04-01), Swindells et al.
patent: 4465658 (1984-08-01), Fredette
patent: 4683039 (1987-07-01), Twardowski et al.
patent: 4798715 (1989-01-01), Hardee et al.
patent: 4808215 (1989-02-01), Twardowski
patent: 4915927 (1990-04-01), Lipsztajn et al.
patent: 5084148 (1982-01-01), Kazcur et al.
patent: 5091166 (1992-02-01), Engstrom et al.
patent: 5091167 (1992-02-01), Engstrom et al.
patent: 5106465 (1992-04-01), Kaczur et al.
patent: 5108560 (1992-04-01), Cawlfield et al.
patent: 5116595 (1992-05-01), Scribner et al.
patent: 5122240 (1992-06-01), Cowley et al.
patent: 5174868 (1992-12-01), Lipsztajn et al.
patent: 5198080 (1993-03-01), Cowley et al.
patent: 5230779 (1993-07-01), Martin
Jorissen et al, "The Behaviour of Ion Exchange Membranes in Electrolysis and Electrolysis and Electrodialysis of Sodium Sulfate", Journal of Applied Electrochemistry, vol. 21, 1991, pp. 869-870. No Month.
Abstract EPO, WPI, Section Ch. Week 9126, Derwent Publications, London, GB, Class E36, AN 91-188766 JP3-115102A May 1991.

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