Method for the preparation of naphthalene dicarboxylic acids

Details Method for the preparation of naphthalene dicarboxylic acids Method for the preparation of naphthalene dicarboxylic acids

1988-12-15

1990-05-15

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

502 25, 502152, 502304, 502324, 502325, 562414, 562417, 562486, 562487, 562488, C07C 51265, B01J 3864

Patent

active

049259776

ABSTRACT:
An improved method for the preparation of a naphthalene dicarboxylic acid by liquid-phase catalytic oxidation of a diisopropylnaphthalene in a lower fatty acid-based solvent is disclosed wherein a catalyst system comprising bromine and the heavy metals cerium, cobalt, and manganese is used. The cerium compound used as a cerium source for the catalyst can be recovered from crystals of the naphthalene dicarboxylic acid product by dissolving the crystals in an alkali solution and separating the cerium compound as insolubles from the solution.

REFERENCES:
patent: 4709088 (1987-11-01), Hirose et al.
patent: 4764638 (1988-08-01), Feld
patent: 4794195 (1988-12-01), Hayashi et al.

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