Claims
- 1. A process for producing methacrylic acid by vapor phase oxidation of methacrolein with molecular oxygen or molecular oxygen-containing gas in the presence of isobutylene and/or tertiary butanol and in the presence of a catalyst having heteropoly acid structure and represented by the following general formula:
- Mo.sub.a V.sub.b P.sub.c X.sub.d O.sub.f
- wherein Mo, V, P and O represent molybdenum, vanadium, phosphorus and oxygen, respectively, X represents the coexistence of copper and arsenic, and a, b, c, d, and f represent the atomic ratio of the 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 3 or less than 3 excluding 0,
- f is a number determined depending on the valancy and atomic ratio of other elements.
- 2. The process of claim 1 wherein the atomic ratio a is 10, b is a number of 0.5 to 3, c is a number of 0.5 to 3 and d is a number of 0.01 to 1.
- 3. The process of claim 1 or 2 wherein the amount of isobutylene and/or tertiary butanol added to the feed is in the range of 0.1 to 30% based on mole fraction of methacrolein and isobutylene and/or tertiary butanol.
- 4. The process of claim 1 or 2 wherein the oxidation reaction temperature is 250.degree. to 400.degree. C. and the space velocity is 100 to 6000 hr.sup.-1.
- 5. The process of claim 1 or 2 wherein the oxidation reaction temperature is 250.degree. to 360.degree. C. and the space velocity is 500 to 3000 hr.sup.-1.
- 6. The process of claim 1 or 2 wherein the molar ratio of oxygen to methacrolein and isobutylene and/or tertiary butanol is 0.5 to 20.
- 7. The process of claim 1 or 2 wherein the reaction is carried out in the presence of steam.
Priority Claims (1)
Number |
Date |
Country |
Kind |
54-32323 |
Mar 1979 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 130,130, filed Mar. 13, 1980, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4178464 |
Sakamoto et al. |
Dec 1979 |
|
4467113 |
Matsumoto et al. |
Aug 1984 |
|
Continuations (1)
|
Number |
Date |
Country |
Parent |
130130 |
Mar 1980 |
|