Oxydehydrogenation of isobutyric acid and its lower alkyl esters
AssigneeAshland Oil, Inc.
InventorChelliah Daniel
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Abstract
Isobutyric acid or a lower alkyl ester thereof is oxidatively dehydrogenated in the vapor phase to produce the corresponding .alpha.,B-olefinically unsaturated derivative by contact with a heterogeneous catalyst in the presence of molecular oxygen. The catalyst is composed of the calcined phosphates of chromium, molybdenum and tungsten.
Claims3
In a process for the catalytic conversion of isobutyric acid or a lower alkyl ester thereof to the corresponding .alpha.,B-olefinically unsaturated derivative by oxydehydrogenation wherein a catalyst is contacted with a gaseous feed stream containing said acid or ester and molecular oxygen at a temperature between 300.degree. and 550.degree. C.;
- the improvement comprising using as catalyst a material having the gram-atom empirical formula Cr.sub.a P.sub.b W.sub.c Mo.sub.d O.sub.x wherein a is 0.01 to 1.0, b is 0.05 to 3.0, c is 0.01 to 3.0, d is 1 to 12.0, and x is determined by satisfying the sum of the unshared positive valences of the other elements shown in the formula.
Dependencies are inferred from the claim text.