Three-compartment cell with self-pressurized buffer compartment

Details Three-compartment cell with self-pressurized buffer compartment Three-compartment cell with self-pressurized buffer compartment

C - Chemistry, Metallurgy

25

B

204/64.1, 204/15

C25B 1/46 (2006.01) C25B 9/08 (2006.01)

Patent

CA 1153730

ABSTRACT OF THE DISCLOSURE The invention describes a self-pressurized three- compartment membrane cell and a process for electrolyzing aqueous alkali metal halide solutions at low cell voltages and high cathode current efficiencies. Electrochemically- active electrodes are physically bondea to ion-exchange permselective membranes which divide the cell into three compartments. The mass transport characteristics of the membranes are selected so that water brought into the center or buffer compartment along with the halide ions tends to exceed water transport out of the compartment thereby to increase the pressure in the buffer compartment until equilibrium conditions are reached. This results in good electrode-to-current collector contact, as the electrochemically-active electrodes which are bonded to the membranes are forced against their corresponding current collectors.

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