印度信诚工业公开了一种PTA生产中金属催化剂的回收工艺。首先利用草酸催化剂I将有机酯水解为相应的羧酸和醇,反应后将含有羧酸、醇、水和催化剂的产物分离净化,除去其中的醇和水,获得含有催化剂I的排放物a;采用含有醋酸钴或醋酸锰的金属盐作为催化剂Ⅱ,催化含PX的混合芳烃进行液相氧化反应,得到含有PTA和催化剂Ⅱ的 India Pa Hsin-cheng Industry discloses a PTA production of metal catalyst recovery process. First, the oxalic acid catalyst I is used to hydrolyze the organic ester into the corresponding carboxylic acid and alcohol. After the reaction, the product containing the carboxylic acid, alcohol, water and catalyst is separated and purified to remove the alcohol and water therein to obtain the effluent a containing the catalyst I; A metal salt containing cobalt acetate or manganese acetate as a catalyst II catalyzes a liquid phase oxidation reaction of a mixed aromatic hydrocarbon containing PX to obtain a liquid phase containing PTA and catalyst II