Montedison S.p.a.

Romano Covini

Guido Petrini

Giancarlo Battiston

Mario Padovan

Giordano De Alberti

Enrico Cavaterra

Luciano Moreschini

Leonardo Dalloro

Raymond Le Van Mao

Enrico Moretti

Giordano DeAlberti

Orlando Pilati

Fausto Genoni

Preparation of aliphatic alpha, beta-unsaturated carboxylic acids from the corresponding saturated acids by oxidative dehydrogenation, at a temperature between 250.degree. and 500.degree. C., in the presence of a catalyst of empirical formula: FeP.sub.x Me.sub.y Me'.sub.t O.sub.z wherein Me is at least one alkali or alkaline earth element, Me' is at least one element selected from the group consisting of Ni, Cu, Ce, Al, Zr, Hf and Pr, x is between 0.2 and 15, y is between 0.01 and 2, t is between 0.01 and 5 and z is such as to satisfy the valencies of the other elements.

Process for the production of methacrylic acid

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:

Process for the preparation of unsaturated carboxylic acids by the

Method for preparing zeolites

A process is disclosed for preparing acrylic acid or methacrylic acid comprising reacting in vapor phase acrolein or methacrolein (respectively) with molecular oxygen or 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 the solid catalyst comprises molybdenum, vanadium, tungsten, cobalt, chromium and oxgyen chemically combined with these elements, the atomic ratios among the aforesaid elements being represented by the empirical formula: Mo.sub.12 V.sub.a W.sub.b Co.sub.c Cr.sub.d O.sub.e, wherein:

Process for preparing unsaturated carboxylic acids by gas phase

A process is disclosed for the preparation of acrylic acid or methacrylic acid, comprising reacting in vapor phase acrolein or methacrolein with molecular oxygen or 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, wherein the catalyst consists of molybdenum, vanadium, tin, and one of the elements chromium, nickel, manganese, as well as oxygen chemically combined with the above-indicated elements, the atomic ratios of the elements being represented by the empirical formula:

Alpha, beta-unsaturated acids are obtained by gas-phase catalytic oxidation of saturated acids containing from 3 to 8 carbon atoms. The catalyst used has the empirical composition

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Milan, Italy

Romano Covini