Electrochemical process for purifying hydroxide compounds

C - Chemistry – Metallurgy – 01 – B

Patent

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C01B 13/16 (2006.01) B01D 61/44 (2006.01) C07C 209/84 (2006.01) C07C 213/10 (2006.01) C25B 1/16 (2006.01) C07C 211/63 (2006.01)

Patent

CA 2217626

In one embodiment, the invention relates to a process for purifying solutions containing a hydroxide compound, including the steps of: (A) providing an electrochemical cell containing an anode, a cathode, a cation selective membrane and an anion selective membrane, wherein the cation selective membrane is positioned between the cathode and the anion selective membrane, and the anion selective membrane is positioned between the cation selective membrane and the anode, thereby defining a feed compartment between the cation selective membrane and the anion selective membrane, a recovery compartment between the cathode and the cation selective membrane. and a water compartment between the anion selective membrane and the anode; (B) charging a solution of an ionic compound at a first concentration to the water compartment, and water to the recovery compartment; (C) charging a solution of the hydroxide compound at a second concentration to the feed compartment; (D) passing a current through the cell to produce the hydroxide compound at a third concentration in the recovery compartment; and (E) recovering hydroxide compound from the recovery compartment.

Une application de cette invention porte sur un processus de purification de solutions contenant un composé d'hydroxyde. Ce processus comporte les étapes suivantes : A) obtenir une cellule électrochimique renfermant une anode, une cathode, une membrane sélective cationique et une membrane sélective anionique. La membrane sélective cationique est placée entre la cathode et la membrane sélective anionique, et la membrane sélective anionique est placée entre la membrane sélective cationique et l'anode. On définit ainsi un compartiment d'alimentation entre la membrane sélective cationique et la membrane sélective anionique, un compartiment de récupération entre la cathode et la membrane sélective cationique, ainsi qu'un compartiment d'eau entre la membrane sélective anionique et l'anode; B) mettre une solution d'un composé ionique à une première concentration dans le réservoir d'eau, et de l'eau dans le compartiment de récupération; C) mettre une solution du composé d'hydroxyde à une seconde concentration dans le compartiment d'alimentation; D) faire passer un courant dans la cellule pour obtenir un composé d'hydroxyde à une troisième concentration dans le compartiment de récupération; E) récupérer le composé d'hydroxyde dans le compartiment de récupération.

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