Process for the production of hydrogen peroxide and chlorate

Details Process for the production of hydrogen peroxide and chlorate Process for the production of hydrogen peroxide and chlorate

C - Chemistry, Metallurgy

25

B

C25B 1/26 (2006.01) C25B 1/30 (2006.01)

Patent

CA 2612545

The invention relates to a process for the production of alkali metal chlorate comprising: providing an electrochemical cell comprising an anode and a cathode in separate anode and cathode compartments; contacting the cathode with an electrolyte comprising at least one organic mediator and one or more organic or mineral acids; reacting the organic mediator at the cathode to form at least one reduced form of the mediator; reacting the at least one reduced form of the mediator with oxygen to form hydrogen peroxide; contacting the anode with an anolyte comprising alkali metal chloride; reacting chloride at the anode to form chlorine that is hydrolysed; and, reacting the hydrolysed chlorine to form chlorate.

L'invention concerne un procédé de production de chlorate de métal alcalin, qui consiste: à fournir une pile électrochimique comprenant une anode et une cathode situées dans des compartiments d'anode et de cathode séparés; à mettre la cathode en contact avec un électrolyte comprenant au moins un médiateur organique et un ou plusieurs acides organiques ou minéraux; à faire réagir le médiateur organique au niveau de la cathode pour former au moins une forme réduite du médiateur; à faire réagir les formes réduites du médiateur avec de l'oxygène pour former du peroxyde d'hydrogène; à mettre l'anode en contact avec un anolyte comprenant du chlorure de métal alcalin; à faire réagir le chlorure au niveau de l'anode pour former du chlore qui est hydrolysé; et, à faire réagir le chlore hydrolysé pour former du chlorate.

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