Mitsubishi Gas Chemical Company, Inc.

Kouichi Kitahara

Takashi Suzuki

Tomiyoshi Furuta

Sadao Nozaki

A method of recovering a catalytic cobalt and/or manganese from a distillation residue in a process for preparing an aromatic carboxylic acid comprising a liquid-phase oxidation of the aromatic hydrocarbon having aliphatic substituent(s) or its oxidized derivatives in the presence of the catalytic cobalt and/or manganese and the distillation of the reaction product, which comprises successively or simultaneously treating the distillation residue with water and with an organic solvent having a relative dielectric constant D of

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Niigata, Japan

Kouichi Kitahara