Process for the combined electrochemical production of...

C - Chemistry – Metallurgy – 25 – B

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C25B 1/28 (2006.01)

Patent

CA 2229229

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 °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.

Pour produire de manière combinée du bisulfate de peroxyde de sodium et de la soude caustique à partir de sulfate de sodium, une électrolyse est effectuée dans au moins une cellule électrolytique à deux chambres, avec des chambres cathodique et anodique séparées par une membrane échangeuse de cations, une température d'électrolyse comprise entre 30 et 70 DEG C est ajustée, une solution de sulfate de sodium saturée à au moins 75 % à cette température est introduite dans la chambre anodique et les concentrations en ions sodium sont maintenues entre 4,5 et 6,0 mol/l, et la soude caustique est extraite de la chambre cathodique.

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