Method of operating chlor-alkali cells

Details Method of operating chlor-alkali cells Method of operating chlor-alkali cells

C - Chemistry, Metallurgy

25

B

C25B 1/46 (2006.01)

Patent

CA 2057826

Disclosed is an improved method of making chlorine and alkali metal hydroxide, e.g., sodium hydroxide, in an electrolytic cell of the type wherein a liquid permeable diaphragm separates the anolyte from the catholyte, said method comprising adding to the anolyte, while the cell is operating, a hydrated aluminum silicate containing clay mineral, followed by lowering the pH of the anolyte by the addition of an inorganic acid and maintaining the anolyte at said lowered pH for a time sufficient to restore the cell to a predetermined current efficiency.

Méthode améliorée pour l'obtention de chlore et d'hydroxyde de métal alcalin, p. ex. d'hydroxyde de sodium, dans une cellule d'électrolyse, où un diaphragme perméable aux liquides sépare l'anolyte du catholyte; la méthode consiste à ajouter à l'anolyte, pendant que la cellule fonctionne, un silicate d'aluminium hydraté renfermant un minéral argileux, puis à abaisser le pH de l'anolyte par addition d'un acide minéral et à maintenir l'anolyte à ce pH réduit pendant assez longtemps pour que la cellule retrouve le rendement en courant déterminé préalablement.

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