Process for electrochemical oxidation of ferrocyanide to...

C - Chemistry – Metallurgy – 25 – B

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C25B 1/00 (2006.01) C07D 491/10 (2006.01)

Patent

CA 2503118

The present invention concerns a process for oxidizing an aqueous phase comprising ferrocyanide (V) which is recovered from an oxidative phenolic coupling reaction, to an aqueous phase comprising ferricyanide (IV), in a divided electrochemical cell, comprising preparing an anolyte comprising pretreating the aqueous phase comprising ferrocyanide (V) which is recovered from an oxidative phenolic coupling reaction by. decantation or extraction or filtration; placing the anolyte in contact with an anodic electrode of the divided electrochemical cell; placing a catholyte in contact with a cathodic electrode of the divided electrochemical cell; and applying electrical power to the divided electrochemical cell, wherein the electrical power has an amperage or voltage and wherein the applying is for a time period sufficient to oxidize the ferrocyanide (V) to ferricyanide (IV).

L'invention concerne un procédé d'oxydation d'une phase aqueuse comprenant ferrocyanure (V) obtenue d'une réaction de couplage phénolique oxydante, en une phase aqueuse comprenant ferricyanure (IV), dans une cellule électrochimique à diaphragme. Ce procédé consiste à préparer un anolyte, consistant à prétraiter la phase aqueuse comprenant ferrocyanure (V) obtenue d'une réaction de couplage phénolique oxydante par décantation ou par extraction ou par filtration; à mettre en contact ledit anolyte avec une électrode anodique de la cellule électrochimique à diaphragme; à mettre en contact un catholyte avec une électrode cathodique de la cellule électrochimique à diaphragme; et à appliquer le courant électrique à la cellule électrochimique à diaphragme, le courant électrique présentant une intensité ou une tension et l'application s'effectuant pendant un temps suffisant pour oxyder le ferrocyanure (V) en ferricyanure (IV).

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