Patent ID: 8197649

Claim:
An ion exchange membrane electrolytic cell comprising an anode chamber accommodating an anode and a cathode gas chamber accommodating a gas diffusion electrode, the anode and the cathode gas chamber being divided by an ion exchange membrane wherein a metallic cushion is accommodated under compression between a back plate of the cathode gas chamber and the gas diffusion electrode such that a repulsive force of the metallic cushion at a bottom part of the cathode gas chamber is larger than that at a top part of the cathode gas chamber; and wherein the repulsive force at respective points in a longitudinal direction of the metallic cushion is larger than the pressure difference between the anode chamber liquid pressure and the cathode gas chamber pressure, and the excess of the repulsive force over the pressure difference, during operation of the electrolytic cell, is a minimum of 1 kPa and a maximum of 7.2 kPa.