Process for producing terephthalic acid by catalytic liquid phase oxidation of para-xylene

摘要

A process for producing terephthalic acid by the catalytic liquid phase oxidation of para-xylene with either molecular oxygen or a gas containing molecular oxygen and recovering terephthalic acid from the liquid phase oxidation reaction product; characterized in that (1) the recovery of terephthalic acid is performed at a temperature (T.sub.2) which satisfies the following equation ##EQU1## wherein (T.sub.1) is the temperature of the above liquid phase oxidation, and (2) a part or whole of the catalyst-containing mother liquor remaining after the recovery of terephthalic acid is recycled to the catalytic liquid phase oxidation while maintaining it at a temperature (T.sub.3) which satisfies the following equation ##EQU2##wherein (T.sub.2) is the temperature employed in the recovery of terephthalic acid.