Electro-oxidation of Hydrogen Chloride to Chlorine in a Membrane Equipped Cell

摘要

In the past several decades substantial energy and cost savings have been made in commercial chlorine production due to the application of DSA . Limited room has been left for further improvement of the anodic potential in the electrolysis of hydrogen chloride. Reducing metal ions from high valence to low valence, such as Cu~(2+)/Cu~+ and Fe~(3+)/Fe~(2+), instead of generating hydrogen gas at the cathode in a membrane-equipped cell would reduce the cathodic potential significantly and result in a lower cell voltage. In this paper, the cathodic potentials of DSA~(~R) as a function of catholyte compositions and current densities during the electro-oxidation of hydrogen chloride in a membrane-equipped cell are reported. The effect of operating conditions on the cell voltage and current efficiency is presented. The choices of regenerating the high-valence metal ions are also discussed.