Process of preparing solutions of alkali peroxide and...

Details Process of preparing solutions of alkali peroxide and... Process of preparing solutions of alkali peroxide and...

C - Chemistry, Metallurgy

25

B

C25B 1/30 (2006.01) C25B 1/28 (2006.01)

Patent

CA 2163896

A process is described in which an aqueous alkaline solution of peroxide or percarbonate is prepared in an electrochemical cell, which comprises a porous oxygen diffusion cathode and a depolarized metal anode or hydrogen diffusion anode. In that process the cell is operated at a low external cell voltage, an electrolyte which contains alkali hydroxide and/or alkali carbonate is passed in said cell through the chamber disposed between the oxygen diffusion cathode and the anode, alkali peroxide and/or alkali percarbonate is formed by a reduction of oxygen at the cathode, and the H2O2/alkali molar ration is less than 4.

Il est décrit un procédé de production d'une solution aqueuse alcaline de peroxyde et/ou de percarbonate, dans une cellule électrochimique comprenant une cathode (1) poreuse de diffusion d'oxygène, ainsi qu'une anode (2). Le procédé selon l'invention est caractérisé en ce que la cellule est mise en fonctionnement au moyen d'une faible tension extérieure de cellule, et en ce qu'on envoie à travers l'enceinte de ladite cellule, entre la cathode de diffusion d'oxygène et l'anode, un électrolyte (7) renfermant un hydroxyde alcalin et/ou un carbonate alcalin, et en ce qu'il se forme, par réduction cathodique de l'oxygène, un peroxyde alcalin et/ou un percarbonate alcalin, le rapport molaire H2O2/produit alcalin étant inférieur à 4.

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