Patent ID: 8747647
Filing Date: 2014-06-10
Classification: C25B,H01M,Y02E

Abstract:
1. A process for the electrolysis of an aqueous solution of hydrogen chloride or alkali metal chloride in an electrolysis cell, which comprises: providing an anode half element having an anode, a cathode half element having a gas diffusion electrode as a cathode and a cation-exchange membrane for electrolytically separating the anode half element and the cathode half element, feeding an oxygen-containing gas to the cathode half element and discharging gas containing excess oxygen from the cathode half element, and at least partly feeding the gas containing excess oxygen taken off from the cathode half element to a gas separation apparatus in which the gas containing excess oxygen is separated into an oxygen-rich fraction and a low-oxygen fraction and the oxygen-rich fraction is subsequently fed to the cathode half element.