Synthesis of onium hydroxides from onium salts

Details Synthesis of onium hydroxides from onium salts Synthesis of onium hydroxides from onium salts

C - Chemistry, Metallurgy

25

B

C25B 3/00 (2006.01) B01D 59/42 (2006.01) B01D 59/50 (2006.01) B01D 61/44 (2006.01) C07C 209/68 (2006.01) C07F 9/54 (2006.01) C07C 211/63 (2006.01)

Patent

CA 2285230

The present invention provides a process for preparing onium hydroxide from a corresponding onium salt and for purifying onium hydroxide including providing an electrochemical cell containing a cathode, an anode, a divider and a bipolar membrane, the bipolar membrane having an anion selective side facing the anode and a cation selective side facing the cathode, wherein the divider is positioned between the cathode and the bipolar membrane, and the bipolar membrane is positioned between the divider and the anode, thereby defining a feed compartment between the divider and the bipolar membrane, a recovery compartment between the divider and the cathode, and a water compartment between the bipolar membrane and the anode, charging a solution containing at least one of the onium salt and the onium hydroxide to be purified to the feed compartment; charging a liquid electrolyte to the other compartments; passing a current through the electrochemical cell to produce the onium hydroxide in the recovery compartment; and recovering the onium hydroxide from the recovery compartment.

L'invention porte sur un procédé de préparation d'hydroxyde d'onium à partir d'un sel d'onium correspondant, et de purification dudit hydroxyde. On utilise à cet effet une cellule électrochimique comportant une cathode, une anode, un séparateur et une membrane bipolaire dont le côté sélecteur d'anions fait face à l'anode, et le côté sélecteur de cations, à la cathode. Le séparateur est placé entre la cathode et la membrane bipolaire, et la membrane bipolaire entre le séparateur et la cathode, ce qui crée un compartiment d'alimentation entre le séparateur et la membrane bipolaire, un compartiment de récupération entre le séparateur et la cathode, et un compartiment pour l'eau entre la membrane bipolaire et l'anode; puis on charge dans le compartiment d'alimentation une solution contenant au moins l'un des sels d'onium et l'hydroxyde d'onium à purifier, et un électrolyte liquide dans les autres compartiments; puis on fait passer un courant à travers la cellule électrochimique qui transporte l'hydroxyde d'onium dans le compartiment de récupération d'où il est extrait.

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