Montedison S.p.a.

Francesco Pignataro

Mario Padovan

Enrico Cavaterra

Giancarlo Battiston

Giuseppe Leofanti

Giordano DeAlberti

Donato Petrera

Gabriele Colucci

A process is disclosed for preparing unsaturated carboxylic acids consisting essentially in reacting in the vapor phase an unsaturated aldehyde with molecular oxygen or an oxygen-containing gas, at a temperature ranging from 200.degree. to 370.degree. C., in the presence of a solid catalyst, with a contact time between 0.5 and 5 seconds, characterized in that the catalyst consists essentially of molybdenum, vanadium, cobalt, and optionally tungsten, these elements being chemically combined with oxygen and the atomic ratios of the elements being represented by the empirical formula Mo.sub.12 V.sub.a W.sub.b Co.sub.c O.sub.d

Process for preparing unsaturated carboxylic acids by the catalytic

Methacrolein is prepared by the gaseous phase reaction of isobutene and oxygen, in the presence of new solid catalysts consisting of the elements tellurium, cerium, molybdenum, of one or more of the elements lithium, sodium potassium, rubidium, cesium and, in addition, of oxygen.

Process for preparing methacrolein from isobutene and oxygen

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Milan, Italy

Francesco Pignataro