Process for producing terephthalic acid

摘要

A process is disclosed for producing terephthalic acid which comprises oxidizing in a liquid-phase a starting raw material comprising p-xylene containing 3 to 35% by weight of p-tolualdehyde based on the same at a temperature in the range of 120 to 240{C by means of a molecular oxygen-containing gas using a lower aliphatic monocarboxylic acid as a solvent in the presence of a catalyst comprising a manganese compound having 50 to 1000 ppm by weight of manganese atoms, a cobalt compound having 50 to 2000 ppm by weight of cobalt atoms and a bromine compound having 100 to 4000 ppm by weight of bromine atoms, each based on the solvent.