Claims
- 1. A process for the preparation of maleic anhydride which comprises contacting a feedstock consisting of n-butane and a gas containing molecular oxygen in the vapor phase in the presence of a phosphorus-vanadium mixed oxide catalyst the atomic ratio of vanadium to phosphorus being in the range of 0.5:1 to 1.25:1 wherein the catalyst has a characteristic powder X-ray diffraction pattern using copper K alpha radiation as follows:
- ______________________________________ Line Positiond angstrom 2.0 degrees Intensity______________________________________5.7 15.6 674.5 19.7 473.7 24.3 363.3 27.1 533.1 28.8 262.9 30.5 1002.8 32.2 172.7 33.7 20______________________________________
- 2. A process for the preparation of maleic anhydride which comprises contacting a feedstock consisting of n-butane and a gas containing molecular oxygen in the vapor phase at a temperature of about 600.degree. to about 750.degree. F. in the presence of a phosphorus-vanadium mixed oxide catalyst the atomic ratio of vanadium to phosphorus being in the range of 0.5:1 to 1.25:1 wherein the catalyst has a characteristic powder X-ray diffraction pattern using copper K alpha radiation as follows:
- ______________________________________ Line Positiond angstrom 2.0 degrees Intensity______________________________________5.7 15.6 674.5 19.7 473.7 24.3 363.3 27.1 533.1 28.8 262.9 30.5 1002.8 32.2 172.7 33.7 20______________________________________
- 3. A process for the preparation of maleic anhydride which comprises contacting a feedstock comprising about 0.5 to about 1.9 mole percent n-butane and a gas containing molecular oxygen in the vapor phase in the presence of a phosphorus-vanadium mixed oxide catalyst the atomic ratio of vanadium to phosphorus being in the range of 0.5:1 to 1.25:1 wherein the catalyst has a characteristic powder X-ray diffraction pattern using copper K alpha radiation as follows:
- ______________________________________ Line Positiond angstrom 2.0 degrees Intensity______________________________________5.7 15.6 674.5 19.7 473.7 24.3 363.3 27.1 533.1 28.8 262.9 30.5 1002.8 32.2 172.7 33.7 20______________________________________
Parent Case Info
This is a division, of application Ser. No. 149,842, filed May 14, 1980 now U.S. Pat. No. 4,283,288.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4209423 |
Hutchings et al. |
Jun 1980 |
|
Divisions (1)
|
Number |
Date |
Country |
Parent |
149842 |
May 1980 |
|