Electrolytic process for producing chlorine dioxide

Details Electrolytic process for producing chlorine dioxide Electrolytic process for producing chlorine dioxide

C - Chemistry, Metallurgy

25

B

C25B 1/26 (2006.01)

Patent

CA 2250527

A process for converting in a single pass an aqueous alkaline pH, alkali metal chlorite solution into an aqueous chlorine dioxide-containing solution that involves the combination of (1) using an electrochemical acidification cell to lower the pH value of the aqueous alkali metal chlorite feed before it enters the anode compartment of an electrochemical oxidation cell where the chlorite is converted to chlorine dioxide with (2) using an anolyte flow pattern where the anolyte passes through a porous, high surface area electrode. This process results in a substantially improved conversion efficiency per pass.

Un procédé permettant la transformation, en une seule étape, d'une solution aqueuse et basique de chlorite de métal alcalin en une solution aqueuse contenant du dioxyde de chlore, grâce à la combinaison de 1) l'utilisation d'une cellule électrochimique d'acidification pour réduire la valeur du pH de la solution aqueuse de chlorite de métal alcalin avant son insertion dans le compartiment de l'anode d'une cellule électrochimique d'oxydation où le chlorite est transformé en dioxyde de chlore, 2) au moyen de la circulation de l'anolyte au travers d'une électrode poreuse à grande surface. Ce procédé permet d'accroître substantiellement l'efficacité de la transformation pour chaque cycle.

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