Claims
- 1. A process for producing methacrylic acid by oxidation of methacrolein in vapor phase with molecular oxygen or a gas containing molecular oxygen characterized in that said oxidation of methacrolein is carried out in the presence of a catalyst of a mixture of a heteropolyacid and its salt which has a composition represented by the following formula:
- Mo.sub.a V.sub.b P.sub.c X.sub.d Y.sub.e O.sub.f
- wherein Mo, V, P and O respectively represent molybdenum, vanadium, phosphorus and oxygen; X represents at least one element selected from the group consisting of potassium, rubidium, cesium and thallium; Y represents at least one element selected from the group consisting of copper, silver, tin, thorium, germanium, nickel, iron cobalt, titanium, rhenium, cerium and antimony and a, b, c, d, e and f represent the atomic ratio of said elements where a is 10, b is a number of 6 or less than 6 excluding 0, c is a number of 0.5 to 6, d is a number of 0.5 or less than 0.5 excluding 0, e is a number of 5 or less than 5 excluding 0 and f is a number determined by the valence and atomic ratio of the other elements.
- 2. The process according to claim 1, wherein a is 10, b is 0.5 to 3, c is 0.5 to 3, d is 0.01 to 0.3 and e is 0.01 to 1.
- 3. The process according to claim 1, wherein Y is copper.
- 4. The process according to claim 1, wherein the reaction temperature of said oxidation is between 200.degree. and 400.degree. C.
- 5. The process according to claim 1, wherein said oxidation is conducted in the presence of water vapor.
Priority Claims (1)
Number |
Date |
Country |
Kind |
53-74274 |
Jun 1978 |
JPX |
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Parent Case Info
This application is a continuation of U.S. application Ser. No. 363,008, filed Mar. 29, 1982, now abandoned which is a continuation of U.S. application Ser. No. 044,269 filed May 31, 1979, now abandoned.
US Referenced Citations (6)
Number |
Name |
Date |
Kind |
3875220 |
White et al. |
Apr 1975 |
|
4017423 |
White et al. |
Apr 1977 |
|
4042625 |
Matsuzawa et al. |
Aug 1977 |
|
4113770 |
Akiyama et al. |
Sep 1978 |
|
4320227 |
Matsumoto et al. |
Mar 1982 |
|
4745217 |
Matsumoto et al. |
May 1988 |
|
Foreign Referenced Citations (10)
Number |
Date |
Country |
2514232 |
Oct 1975 |
DEX |
2608583 |
Sep 1976 |
DEX |
2722375 |
Dec 1977 |
DEX |
2304597 |
Oct 1976 |
FRX |
2306188 |
Oct 1976 |
FRX |
52-62220 |
May 1977 |
JPX |
52-68122 |
Jun 1977 |
JPX |
1487765 |
Oct 1977 |
GBX |
1492185 |
Nov 1977 |
GBX |
1523849 |
Sep 1978 |
GBX |
Continuations (2)
|
Number |
Date |
Country |
Parent |
363008 |
Mar 1982 |
|
Parent |
44269 |
May 1979 |
|