申请人:——
公开号:US20020151745A1
公开(公告)日:2002-10-17
A process for producing pyromellitic acid which comprises oxidizing 2,4,5-trimethylbenzealdehyde and/or its oxidized derivative in the presence of a catalyst containing iron, manganese and bromine, or additionally containing zirconium or cerium continuously or semi-continuously using aqueous acetic acid solvent and 0.05-2% by weight of bromide ion. The catalyst used in the present invention has high activity, and the catalyst solution has low corrosive because the reaction is performed at low bromide concentration by using a solvent of aqueous acetic acid. So pyromellitic acid is produced industrially advantageously in high yield continuously or semi-continuously which has been a major difficulty up to now.
一种生产焦苯四甲酸的方法,包括在含有铁、锰和溴的催化剂存在下氧化2,4,5-三甲基苯甲醛和/或其氧化衍生物,或者另外含有锆或铈,连续或半连续地使用水合乙酸溶剂和0.05-2%溴离子重量。本发明中使用的催化剂具有高活性,由于在使用水合乙酸溶剂的情况下以低溴浓度进行反应,催化剂溶液具有低腐蚀性。因此,通过连续或半连续地高产量生产焦苯四甲酸,这是迄今为止的一大难题。