Claims
- 1. A process for producing methacrylic acid by oxidizing methacrolein with molecular oxygen or molecular oxygen-containing gas in the vapor phase characterized by the use of a catalyst having a heteropoly-acid structure and the general formula:
- Mo.sub.a V.sub.b P.sub.c Cu.sub.d X.sub.e O.sub.f
- 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 10
- b 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 the other elements in the formula.
- 2. The process of claim 1, wherein a is 10, b is a number of 0.5 to 2, c is a number of 0.5 to 2, d is a number of 0.01 to 1 and e is a number of 0.01 to 0.5.
- 3. The process of claim 1, wherein X represents one or more elements selected from the group consisting of tin, thorium, germanium, nickel, iron, cobalt, titanium and zirconium.
- 4. The process of claim 1, wherein the reaction temperature is between 200.degree. and 380.degree. C.
- 5. The process of claim 1, wherein the reaction is conducted in the presence of water vapour.
Priority Claims (1)
Number |
Date |
Country |
Kind |
52-129685 |
Oct 1977 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 239,409, filed Mar. 2, 1982, now abandoned, which is a divisional application of Ser. No. 948,761, filed Oct. 5, 1978, now U.S. Pat. No. 4,273,676.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4115441 |
Shaw et al. |
Sep 1978 |
|
4180678 |
Wada et al. |
Dec 1979 |
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Divisions (1)
|
Number |
Date |
Country |
Parent |
948761 |
Oct 1978 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
239409 |
Mar 1982 |
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