ELECTROREDUCTION OF 2-AMINO-5-NITROBENZEN OSULFONIC ACID WITH PALLADIUM PROMOTED COPPER CATHODE

There have been carried out tests to determine conditions of the elect roreduction of 2-amino-5-nitrobenzenosulfonic acid to 2,5-diaminobenze nosulfonic acid process with use of copper electrode as cathode. It ha s been found out that the occurrence of the process on the copper elec trode led to 74% reduction of the acid, but selectivity of the 2,5-dia minobenzenosulfonic acid formation did not exceed 7%. Addition of 2 mo l % of PdCl2 - computing on the substrate - into the electrolyte (NaCI acidified with HCl) increased the process selectivity up to 92% and c onversion of 2-amino-5-nitrobenzenosulfonic acid remained on the same level.