Patent ID: 8778148
Filing Date: 2014-07-15
Classification: C25B

Abstract:
1. Apparatus for the electrolysis of hydrochloric acid having an HCl concentration in the range from 10 to 25% by weight, having an electrode chamber (A) having a cathode ( 1 ) and a further electrode chamber (B) having an anode ( 2 ), with electrode chamber (A) and electrode chamber (B) being separated by an ion-conducting membrane (M) and the cathode and anode ( 1 and 2 ) being electrically conductively connected to a power supply (S), wherein the cathode ( 1 ) has an electrically conductive core ( 1 a ) on which a layer ( 1 b ), having a thickness of 30 μm to 1 mm comprising a polytetrafluoroethylene (PTFE) binder and nitrogen-doped carbon nanotubes and, optionally, a further layer ( 1 c ) between core ( 1 a ) and layer ( 1 b ), with the nitrogen-doped carbon nanotubes having functional groups containing nitrogen.