A PROCESS FOR THE ELECTRO CHEMICAL PRODUCTION OF 2-HYDROXY PARA AMINOBENZOIC ACID FROM 2-HYDROXY-P-NITRO BENZOIC ACID

摘要

A process for the electrochemical production of 2-hydroxy p-aminobenzoic acid from 2-hydroxy-p-nitrobenzoic acid prepared from O-toluidine sulphate, characterised by using a rotating copper cathode one which tin was deposited, having lead or lead silver alloy anode which has been separated from the catholyte by means of a porous diaphragm and using 5 to 15% hydrochloric acid containing 10 to 30% ethanol and 5 to 10% 2-hydroxy p-nitrobenzoic acid as the catholyte and 25 to 35% sulphur acid as anolyte at a cathodic current density of 10 to 25 A/dmSUP2/SUP and at a temperature of 25degrees to 40degrees C.