The invention relates to 3, 3apos; 4, 4 apos, 4, 4 apos; dynamic dehydration method of biphenyltetracarboxylic acid

The invention provides a dynamic dehydration method for 3, 3 ', 4, 4'-biphenyltetracarboxylic acid, and relates to the technical field of chemical reaction. The 3, 3 ', 4, 4'-biphenyltetracarboxylic acid dynamic dehydration method provided by the invention comprises the following steps: (1) sequentially drying, crushing and sieving 3, 3 ', 4, 4'-biphenyltetracarboxylic acid to obtain a 3, 3 ', 4, 4'-biphenyltetracarboxylic acid dry product; and (2) adding the 3, 3 ', 4, 4'-biphenyl tetracarboxylic acid dry product into a spiral dryer, and carrying out dynamic dehydration to obtain 3, 3 ', 4, 4'-biphenyl dianhydride. The method provided by the invention is simple to operate, short in production cycle and high in efficiency, and the 3, 3 ', 4, 4'-biphenyl dianhydride obtained by the method has good particle morphology, good solubility and light color, and is suitable for industrial production. 本发明提供了一种3,3',4,4'-联苯四甲酸动态脱水的方法，涉及化工反应技术领域。本发明提供的3,3',4,4'-联苯四甲酸动态脱水的方法，包括以下步骤：(1)将3,3',4,4'-联苯四甲酸依次进行干燥、粉碎和过筛处理，得到3,3',