Method for production pyromellitic anhydride

Details Method for production pyromellitic anhydride Method for production pyromellitic anhydride

1995-04-04

1996-04-02

Tsang, Cecilia

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

562412, 562413, 562415, C07D30789

Patent

active

055042180

ABSTRACT:
A method for producing efficiently on a commercial scale pyromellitic anhydride having high purity and suffering only sparing coloration in a high yield from a raw material of high concentration is provided. By the use of a multilayer catalyst formed by packing on the reaction gas outlet side a first catalyst containing V and Mo and/or W and having an atomic ratio of Mo and/or W to V in the range of from 0.01 to 2, on the raw material mixed gas inlet side a second catalyst containing V, Mo and/or W and having an atomic ratio of Mo and/or W to V smaller than the atomic ratio of the first catalyst, and/or a third catalyst containing V and an alkali metal and having an atomic ratio of the alkali metal to V in the range of from 0.2 to 2.5, pyromellitic anhydride is produced by the vapor-phase oxidation of a tetraalkyl benzene with a molecular oxygen-containing gas.

REFERENCES:
patent: 4665200 (1987-05-01), Nakanishi et al.
patent: 4694089 (1987-09-01), Kosaha et al.
patent: 4725291 (1988-02-01), Ueoka et al.
patent: 4925957 (1990-05-01), Enomoto et al.
patent: 5387699 (1995-02-01), Wagner et al.

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