PROCESS FOR PRODUCING TEREPHTHALIC ACID

摘要

P-dialkylbenzene or these oxidizing intermediate material was oxidized in liquid phase in the presence of a heavy metal oxidn. catalyst at temp. 80oC-230oC to give terephtalic acid of good quality useful to direct polymn. Thus, concentration condition is 3x10-5-700x10-5 mole phenol per 1l of aliphatic carboxylic acid solvent of low grade.