Preparation of .alpha., .beta.-unsaturated carboxylic acids and anhydrides
AssigneeEastman Chemical Company
InventorsJames Jerry Spivey, Makarand Ratnakav Gogate, Joseph Robert Zoeller, Gerald Charles Tustin
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Abstract
Disclosed is a process for the preparation of .alpha.,.beta.-unsaturated carboxylic acids and anhydrides thereof which comprises contacting formaldehyde or a source of formaldehyde with a carboxylic anhydride in the presence of a catalyst comprising mixed oxides of vanadium, phosphorus and, optionally, a third component selected from titanium, aluminum or, preferably silicon.
Claims3
Process for the preparation of .alpha.,.beta.-unsaturated carboxylic acids and anhydrides thereof which comprises contacting formaldehyde or a source of formaldehyde with a carboxylic anhydride in the presence of a catalyst comprising mixed oxides of vanadium and phosphorus.
Process for the preparation of an .alpha.,.beta.-unsaturated carboxylic acid having the formula ##STR8## which comprises contacting in the gas phase formaldehyde or a source of formaldehyde with a carboxylic anhydride having the formula ##STR9## at a temperature of 250.degree. to 350.degree. C. in the presence of a catalyst comprising the oxides of vanadium, silicon and phosphorus having the formula (excluding oxygen):
- V.sub.x Si.sub.w P.sub.y
- in which the ratio of x:w:y is in the range of about 1:8-12:2-4;
- and wherein R.sup.1 is hydrogen or methyl.
Dependencies are inferred from the claim text.