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Process for the preparation of unsaturated acids from unsaturated aldehydes
| Details |
Inventors: White, James F.; Shaw, Wilfrid G.; Applequist, Michael D.;
Assignee: The Standard Oil Company (Ohio) (Cleveland, OH)
Primary Examiner: Garner; Vivian
Assistant Examiner:
Attorney, Agent or Firm: Hill; Gwenetta Douglas, Knudsen; Herbert D., Evans; Larry W.
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, at least one element selected from the group consisting of Ag, Rh, Ru, and Au, oxygen, and optionally, at least one of Cd, Pt, Tl, Pd, Al, Ge, Cu, Ni, alkaline earth metal, NH.sub.4 and Cl. |
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DETAILED DESCRIPTION We claim: 1.
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.
and optionally in the presence of steam, the improvement comprising using as the 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 at least one element selected from the group consisting of Ag and Au; Y is at least one of Cd, Tl, Al, Ge, Cu, Ni, NH.
sub.
4 and Cl; and 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.
2.
The process of claim 1 wherein a is 0.
001 to 3.
3.
The process of claim 1 wherein b is 0.
001 to 3.
4.
The process of claim 1 wherein b is zero.
5.
The process of claim 1 wherein X is silver.
6.
The process of claim 1 wherein X is gold.
7.
The process of claim 1 wherein Y is cadmium.
8.
The process of claim 1 wherein the catalyst is coated on an inert support.
9.
The process of claim 8 of an inert support material having a diameter of at least 20 microns and an outer surface and a continuous coating of said active catalyst strongly adhering to the outer surface of said support, said coated catalyst being prepared by partially wetting the support with water and rolling the partially wet support in a powder of active catalyst.
10.
The process of claim 9 wherein the active catalyst is about 10 to about 100 percent by weight of the inert support.
11.
The process of claim 9 wherein the support is selected from the group consisting of silica, alumina, Alundum, alumina-silica, silicon carbide, titania and zirconia.
12.
The process of claim 9 wherein the particle size of the inert support is 0.
2 cm.
to 2 cm.
13.
The process of claim 1 wherein methacrylic acid is prepared from methacrolein.
Description:
BACKGROUND OF THE INVENTION A number of catalysts are known to be effective for the oxidation of acrolein or methacrolein to acrylic acid or methacrylic acid, respectively
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Molecular Biology 
