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AssigneeThe Standard Oil Company
InventorsJames F. White, James R. Rege, Robert K. Grasselli, Dev. D. Suresh
Estimating the term…
Catalysts containing tungsten, phosphorus, vanadium and molybdenum have been found to be especially effective for the oxidation of unsaturated aldehydes to form the corresponding unsaturated acid. These catalysts may optionally contain one or more of tin, antimony, arsenic, copper, cerium, boron, chromium, iron, nickel, cobalt, uranium, manganese, strontium, silver, rubidium, rhodium, cadmium, bismuth, indium, zinc and lanthanum.
In the process for the production of methacrylic acid comprising reacting methacrolein with molecular oxygen in the vapor phase at a temperature of 200.degree. to 600.degree. C. in the presence of a catalyst and optionally in the presence of steam, the improvement comprising
Dependencies are inferred from the claim text.
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Containing in addition other metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36: chromium
Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00: mixed oxides other than spinels, e.g. perovskite
Chromium, molybdenum or tungsten: molybdenum
Chromium, molybdenum or tungsten: tungsten
Term ended 24 Jan 1995 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
A number of catalysts are known for the oxidation of unsaturated aldehydes to the corresponding acid, see for example, U.S. Pat. No. 3,567,773. Although most of the disclosures suggest that the catalysts are useful for oxidizing methacrolein to methacrylic acid, it has been found that the yields of methacrylic acid are low and that special catalysts are required in this reaction.
It has now been discovered a process for the production of acrylic acid or methacrylic acid comprising reacting acrolein or methacrolein with molecular oxygen at a temperature of 200.degree. to 600.degree. C., in the presence of a catalyst and optionally in the presence of steam, the improvement comprising
USING A CATALYST CONSISTING ESSENTIALLY OF TUNGSTEN, PHOSPHORUS, VANADIUM, MOLYBDENUM AND OXYGEN, SAID CATALYST HAVING THE FORMULA
Production of methacrylic acid from methacrolein.
Various catalysts of the invention were prepared as described below and tested in the oxidation of methacrolein to methacrylic acid.
W.sub.0.8 P.sub.1.3 V.sub.2 Mo.sub.12 O.sub.x An aqueous slurry containing 86.2 g. Mo0.sub.3, 7.7 g. of 85% H.sub.3 PO.sub.4, 7.5 g. V.sub.2 0.sub.3 and 10.8 g. ammonium paratungstate was prepared. The slurry was refluxed overnight, evaporated and dried at 120.degree. C. overnight.