Process for the combined electrochemical production of sodium peroxide disulphate and soda lye
AssigneeEilenburger Elecktrolyse-und UmweltTechnik GmbH
InventorsWolfgang Thiele, Knut Wildner
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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.
Claims24
A process of the combined preparation of sodium peroxodisulphate and sodium hydroxide solution from sodium sulphate, wherein an electrolysis is carried out in at least one two-chamber electrolysis cell having cathode and anode compartments divided by a cation exchange membrane, an electrolysis temperature of 30 to 70.degree. C. is set, a sodium sulphate solution at least 75% saturated at this temperature is introduced into the anode compartment and the sodium ion concentrations are maintained in the range of from 4.5 to 6.0 mol/l and sodium hydroxide solution is removed from the cathode compartment.
Dependencies are inferred from the claim text.