| 摘要 |
PURPOSE:To directly produce biphenyltetracarboxylic acid by dimerizing industrially readily obtainable phthalic acid as a raw material without a method through a complicated intermediate process. CONSTITUTION:A phthalate such as disodium phthalate, readily produced by neutralizing phthalic anhydride, as a raw material is reacted in the presence of a nitrate under heating and directly dimerized to produce a biphenyltetracarboxylate such as sodium biphenyltetracarboxylate, which is separated as biphenyltetracarboxylic acid. |
