KONTINUIERLICHES VERFAHREN ZUR HERSTELLUNG VON TEREPHTHALSAEURE

摘要

CONTINUOUS PROCESS FOR PRODUCING TEREPHTHALIC ACID A process for producing terephthalic acid is disclosed in which p-xylene is oxidized in a liquid phase with molecular oxygen in the presence of a specific oxidation catalyst to obtain terephthalic acid slurry which is subjected to post-oxidation, then the slurry is separated into solid terephthalic acid and a mother liquor, while the solvent is recovered from the exhaust gas of the oxidation step by removing water, the mother liquor seperated and the solvent recovered being recycled to the oxidation step. thus, the process can be operated with the formation of much less undesirable by-products and with recycling the mother liquor to utilize the raw material of p-xylene as complete as possible.