Process for producing methacrylic acid and a catalyst
Patent 4273676 Issued on June 16, 1981. Estimated Expiration Date: 
October 5, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 5, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3326817 3380931 3437690 3485877 3644497 3875220 Oxidation catalyst Oxidation catalyst for the manufacture of methacrylic acid Method for manufacture of methacrylic acid Catalyst compositions especially useful for preparation of unsaturated acids InventorsAssigneeApplicationNo. 05/948761 filed on 10/05/1978US Classes:502/209, And vanadium containing562/534, Group VIII metal containing catalyst utilized562/535Group V metal containing catalyst utilizedExaminersPrimary: Gantz, Delbert E.Assistant: Wright, William G. Attorney, Agent or FirmInternational ClassesC07C 51/16 (20060101)C07C 51/25 (20060101) B01J 27/14 (20060101) B01J 23/88 (20060101) B01J 23/76 (20060101) B01J 27/199 (20060101) Foreign Application Priority Data1977-10-31 JPAbstractA catalyst having a heteropoly-acid structure and the general formula:wherein Mo, V, P, Cu and O represent respectively molybdenum, vanadium, phosphorus, copper and oxygen, X represents one or more elements selected from the group consisting of tin, thorium, germanium, nickel, iron, cobalt, magnesium, zinc, titanium, lead, rhenium, zirconium and chromium and a, b, c, d, e and f represent the atomic ratio of the elements where,a is 10b is a number of 3 or less than 3 excluding 0,c is a number of 0.5 to 3,d is a number of 3 or less than 3 excluding 0,e is a number of 3 or less than 3 excluding 0,f is a number determined depending on the valency and atomic ratio of other elements.There is also provided a process for producing methacrylic acid by oxidizing methacrolein with molecular oxygen or molecular oxygen-containing gas in the presence of the catalyst defined above.Other References
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