| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing 3,3',4,4'-biphenyltetracarboxylic acid dianhydride in a high catalytic yield (Pd yield), capable of reducing an amount of Pd attached to a reaction vessel in a dimerization reaction of an o-phthalic diester, including the dimerization of the o-phthalic diester by successively replenishing a catalytic component. SOLUTION: This method for producing 3,3',4,4'-biphenyltetracarboxylic acid dianhydride comprises (a) a process for dimerizing an o-phthalic diester in the presence of a catalyst obtained from a powdery palladium salt having >=0.5 m2/g specific surface area and a basic bidentate ligand with adding at least one kind of the components and then separating and collecting 3,3',4,4'- biphenyltetracarboxylic acid tetraester from the reaction system and (b) a process for hydrolyzing the obtained 3,3',4,4'-biphenyltetracarboxylic acid tetraester and drying and anhydrizing obtained 3,3',4,41-biphenyltetracarboxylic acid. |
