3，3′，4，4′-二苯甲酮四羧酸的工艺研究

研究了在钛材反应器中液相空气氧化3，3′，4，4′-四甲基二苯乙烷制备3，3′，4，4′-二苯甲酮四羧酸的反应规律。通过采用Co-Mn-Br组成的高效催化体系以及低温引发、高温完成氧化的工艺，考察反应压力、反应温度和催化剂配比条件对3，3′，4，4′-二苯甲酮四羧酸收率的影响，从而确定液相空气氧化3，3′，4，4′-四甲基二苯乙烷制备3，3′，4，4′-二苯甲酮四羧酸的最佳反应条件为n（Co）／n（Mn）／n（Br）／n（DXE）／n（HAc）=2／2／2／50／250、反应压力2．5MPa、开始反应温度为180℃、控制最终反应温度保持在220℃，酮酸的收率大于90％。该法具有收率高，生产工艺简单，反应溶剂容易回收，三废少等优点。

Study on Synthesis Technique of 3,3',4,4'-Benzophenone Tetracarboxylic Acid

The synthesis of 3,3′,4,4′- benzophenone tetracarboxylic acid by liquid phase air oxidation of 1,1 - bis （ 3,4 - dimethylphenyl） ethane in titanium reactor was studied. The effects of reaction pressure, temperature, proportion of catalyst on the yield of 3,3′,4,4′- benzophenone tetracarboxylic acid was investigated by applying Co - Mn - Br high performance catalyst system and oxidation process of initiating at low temperature and finishing at high temperature, then the optimum conditions for this reaction were obtained as follow ： n（Co） ： n（Mn） ： n（Br） ： n（DXE） ： n（HAc） = 2： 2： 2： 50： 250, the reaction pressure was 2.5MPa, the initiation temperature was 180℃, the final reaction temperature was 220℃, and the yield of the product was more than 90%. This method had a lot of advantages such as high yield, simple process, easy recycling of reaction solvent and less wastes.