Production of acid anhydrides and catalysts therefor

Details Production of acid anhydrides and catalysts therefor Production of acid anhydrides and catalysts therefor

1978-05-15

1980-06-24

Gantz, Delbert E.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252437, 2603467, B01J 2714, C07D30714

Patent

active

042094232

ABSTRACT:
Catalysts for the oxidation of hydrocarbons to acid anhydrides, for example maleic and phthalic anhydrides, are prepared from a vanadium/phosphorus mixed oxide precursor by conditioning it by contact with a strong acid of concentration at least 3 N and solvent extraction to remove unwanted phases. The treated precursor is converted to a catalytically active form by heating. Novel catalysts containing phase X are produced. The catalysts may contain rare earth metal promoters.

REFERENCES:
patent: 3293268 (1968-12-01), Bergman et al.
patent: 3864280 (1975-02-01), Schneider
patent: 3888886 (1975-06-01), Young et al.
patent: 3975300 (1976-08-01), Burress
patent: 3980585 (1976-09-01), Ken et al.
patent: 4056487 (1977-11-01), Ken

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