公开(公告)号：US4824992A

公开(公告)日：1989-04-25

申请号：US104892

申请日：1987-10-06

申请人： Toru Tanaka ,  Tomiyoshi Furuta ,  Kazue Suwa

发明人： Toru Tanaka ,  Tomiyoshi Furuta ,  Kazue Suwa

IPC分类号： B01J27/128 ,  B01J27/00 ,  C07B61/00 ,  C07C51/00 ,  C07C51/255 ,  C07C51/265 ,  C07C63/313 ,  C07C67/00

CPC分类号： C07C51/265

摘要： A process for producing pyromellitic acid which comprises oxidizing 2,4,5-trimethylbenzaldehyde with a gas containing molecular oxygen in the presence of a water solvent containing 0.5 to 12% by weight of bromine ion, 0.01 to 2.0% by weight of manganese ion and 0.1 to 10,000 ppm by weight of iron ion.According to the present invention, pyromellitic acid can be obtained in a high yield and, at the same time, the amount of remaining intermediate compounds such as methyltrimellitic acid and the like can be made few, so that pyromellitic acid can be purified easily.

摘要翻译： 一种制备均苯四酸的方法，其包括在含有0.5-12重量％溴离子，0.01-2.0重量％锰离子的水溶剂和0.01-2.0重量％锰离子的水溶剂存在下，用含有分子氧的气体氧化2,4,5-三甲基苯甲醛，和 0.1〜10,000ppm的铁离子。 根据本发明，可以高收率地获得均苯四酸，同时可以使少量残留的中间体化合物如甲基偏苯三酸等，从而可以容易地纯化均苯四酸。