Amoco Corporation

Standard Oil Company (Indiana)

John K Darin

Walter Partenheimer

Alan G Bemis

Joseph D Figuly

Excess burning of pseudocumene, lowering concentration of use of cobalt and replace it with manganese by the use of less than the previously used 3.0 to 0.1 milligram atom of zirconium, preferable from 0.005 up to 0.075 milligram atom of zirconium, per 1.0 milligram atom of total of transition metals cobalt and manganese or cobalt, manganese and cerium.

Oxidation of pseudocumene to trimellitic acid enhanced by low gram atom

This invention relates to the reclamation of metal oxidation catalysts by water extraction of a high boiling residual mixture remaining after separation of a benzene di- and/or tricarboxylic acid; e.g., the phthalic acids, trimesic acid or trimellitic acid and reaction solvent, if one is used, from the fluid oxidation effluents produced by the catalytic liquid phase oxidation of a xylene, mesitylene, psendocumene or o-xylene and psendocumene with a source of molecular oxygen in the presence or in the absence of a reaction solvent.

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Naperville, IL, United States of America

John K Darin