Hc1 electrolyzer with unitary membrane-electrode structure...

Details Hc1 electrolyzer with unitary membrane-electrode structure... Hc1 electrolyzer with unitary membrane-electrode structure...

C - Chemistry, Metallurgy

25

B

204/78.1

C25B 1/24 (2006.01)

Patent

CA 1179631

52EE 317/312 HCl ELECTROLYZER WITH UNITARY MEMBRANE- ELECTRODE STRUCTURE WITH DISCRETE ANODE PROJECTIONS ABSTRACT OF THE DISCLOSURE An HCl electrolyzer utilizing a membrane with catalytic electrodes physically bonded to the surfaces of the membrane is provided with an electron current conducting structure which comprises an array of individual current conducting elements contacting the electrode. The cell is operated at high temperatures (60° - 90°C) to take advantage of the reduction of electrode overpotential at these temperatures but with low feed acid concentrations (?9M) to minimize hydrogen chloride in the chlorine, i.e., HCl vapor pressure is below 0.1 atmospheres - 76 Torr. There is also a large decrease in membrane resistance as temperature is increased. Simultaneously O2 evolution is suppressed to maintain O2 content in the chlorine at 0.1% or less.

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