Process for the combined electrochemical production of sodium peroxide disulphate and soda lye
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United States of America Patent
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Sep 28, 1999
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Feb 6, 1998
filing date -
Aug 17, 1995
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Abstract
The invention concerns the combined production of sodium peroxide disulphate and soda lye from sodium sulphate. According to the invention, electrolysis is carried out in at least one two-chamber electrolysis cell with cathode and anode chambers separated by a cation-exchanger membrane. The electrolysis temperature is set at between 30 and 70.degree. C., a sodium sulphate solution which is at least 75% saturated at this temperature is introduced into the anode chamber, the sodium ion concentrations are maintained in the range of between 4.5 and 6.0 mol/l and soda lye is extracted from the cathode chamber.
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