| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for inexpensively and efficiently producing 3,3',4,4'-diphenylsulfone-tetracarboxylic acid. SOLUTION: This method for producing 3,3',4,4'-diphenylsulfone- tetracarboxylic acid is characterized by liquid-phase oxydation of 3,3',4,4'- tetramethyldiphenylsulfone with molecular oxygen in the presence of a catalyst consisting of at least one metal selected from the group consisting of manganese, nickel and zirconium, and a bromine compound in a water-containing acetic acid solvent. COPYRIGHT: (C)2003,JPO
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