Process for the preparation of unsaturated acids from unsaturated aldehydes
AssigneeThe Standard Oil Company
InventorsJames F. White, Wilfrid G. Shaw, Michael D. Applequist
Life of this patent
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Abstract
Methacrylic acid or acrylic acid are produced by the oxidation of methacrolein or acrolein, respectively, with molecular oxygen in the vapor phase in the presence of a catalytic oxide of molybdenum, phosphorus, arsenic, a rare earth element or mixture thereof, oxygen, and optionally, at least one of Ag, Tl, Rh, Pd, Ru, Pt, Cd, Al, Au, Cu, alkaline earth metal, Cl, and NH.sub.4.
Claims18
In the process for the production of acrylic acid and methacrylic acid by the oxidation of acrolein and methacrolein respectively, with molecular oxygen in the vapor phase at a reaction temperature of about 200.degree. C to about 500.degree. C. in the presence of a catalyst, and optionally in the presence of steam, the improvement comprising using as a catalyst a catalyst of the formula
- X.sub.a Y.sub.b Mo.sub.12 P.sub.c As.sub.d O.sub.x
- wherein
- X is a rare earth element or a mixture thereof;
- Y is at least one of Ag, Tl, Rh, Pd, Ru, Pt, Cd, Al, Au, Cu, alkaline earth metal, Cl, and NH.sub.4 ;
- wherein
- a is 0.001 to 10;
- b is 0 to 10;
- c is 0.01 to 5;
- d is 0.01 to 5;
- x is the number of oxygens required to satisfy the valence states of the other elements present.
Dependencies are inferred from the claim text.