Process for the preparation of unsaturated carboxylic acids by t

Details Process for the preparation of unsaturated carboxylic acids by t Process for the preparation of unsaturated carboxylic acids by t

1975-11-07

1983-11-08

Shine, W. J.

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

Organic compounds

Carboxylic acids and salts thereof

502317, 502303, C07C 5126, B01J 2322, B01J 2328, B01J 2330

Patent

active

044144121

ABSTRACT:
A process is disclosed for the preparation of acrylic acid or methacrylic acid by reacting in vapor phase acrolein or methacrolein with molecular oxygen or with an oxygen-containing gas, at a temperature between 200.degree. and 350.degree. C., in the presence of a solid catalyst and with a contact time between 0.5 and 5 seconds, characterized in that said catalyst consists of molybdenum, vanadium, tungsten, one or more of the elements selected from the class consisting of silver, titanium, chromium, cerium, lanthanum and tantalum, and oyxgen chemically combined with the above-indicated elements, and wherein the atomic ratios between the various elements present in the catalyst are represented by the empirical formula:

REFERENCES:
patent: 3775474 (1973-11-01), O'Hara et al.
patent: 3956377 (1976-05-01), Dolhyj et al.
patent: 4042533 (1977-08-01), Shaw et al.

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