Method for the catalytic vapor phase oxydehydrogenation of isobu

Details Method for the catalytic vapor phase oxydehydrogenation of isobu Method for the catalytic vapor phase oxydehydrogenation of isobu

1990-08-20

1992-07-21

Killos, Paul J.

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

Organic compounds

Carboxylic acid esters

C07C 6730

Patent

active

051324490

ABSTRACT:
The invention relates to the stabilization of the activity and/or the reactivation of molybdoheteropoly acid catalysts in vapor-phase oxidations, such as the oxidehydrogenation of isobutyric acid or its lower esters to methacrylic acid or its lower esters, by means of an oxidizing treatment of the catalyst in which compounds of catalyst constituents are added, at temperatures ranging from 200.degree. to 400.degree. C., with an oxygen-containing gas.
The inventive activation measures can be carried out either during the catalytic vapor-phase reaction, such as oxihydrogenation in particular, or intermittently to alternate therewith, and optionally also physically separated in part from each other.

REFERENCES:
patent: 4439621 (1984-03-01), Daniel
patent: 4499302 (1985-02-01), Moreschini et al.
patent: 4720575 (1988-01-01), Gruber et al.
patent: 4864057 (1989-09-01), Pedersen

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