Diamond Shamrock Corporation

Ronald L LaBarre

Frank Solomon

Donald F Lieb

Disclosed are methods of operation for oxygen electrodes which maximize the power efficiency available from such oxygen electrodes while minimizing the voltage necessary to operate such oxygen electrodes. These methods include control of the pressure of the air feed side of the oxygen electrode, control of the total flow of the air feed side, the humidification of the air feed side of the oxygen electrode and the elimination of CO.sub.2 from the air feed to the oxygen electrode to increase the lifetime of such electrodes as applied to a chlor-alkali electrolytic cell.

Air-depolarized chlor-alkali cell operation methods

Disclosed are methods for rejuvenation of oxygen electrodes which maximize the power efficiency available from such oxygen electrodes while minimizing the voltage necessary to operate such oxygen electrodes over extended periods of time. These methods include in situ and out of cell techniques using hot water washing followed by air drying and dilute acid washing followed by air drying.

Oxygen electrode rejuvenation methods

A batch type sodium hypochlorite generator and temporary storage unit comprising a sheet anode and a sheet cathode utilizing vertical S-shaped bipolar sheet electrodes in series therebetween, the cathode and cathodic end of each bipolar unit being substantially encircled by the anode or anodic end of the next adjacent bipolar unit and forming an electrolytic cell therebetween; said anode portion of each electrode having the surface thereof coated with a dimensionally stable electrode coating which is extremely resistant to passivation; nonconductive spacers between each such electrolytic cell to both hold the electrodes in proper alignment and to minimize stray currents between the electrolytic cells; and control means for feeding brine to such generator and discharging such sodium hypochlorite solution therefrom when required.

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Euclid, OH, United States of America

Ronald L LaBarre