US4002650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of maleic anhydride from n-butane
Assignee: Standard Oil Co
•
Filing: 1973-12-10
•
Granted: 1977-01-11
•
Expires: 1993-12-10
Abstract
Abstract Catalysts containing the oxides of vanadium, phosphorus and uranium have been found to be especially effective in the oxidation of n-butane, n-butenes and butadiene with molecular oxygen in the vapor phase to yield maleic anhydride. The reaction with n-butane gives an especially pure product in high yield.
Inventors
- 👤 Noel J. Bremer
- 👤 Ernest C. Milberger
- 👤 Serge R. Dolhyj
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:43
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/215; B; B01; B01J; B01J23/00; B01J23/16; B01J23/20; B01J23/22; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; C07C51/25; C07C51/252
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
In the process for the production of maleic anhydride by the oxidation of n-butane with molecular oxygen in the vapor phase at a reaction temperature of 350°-600° C. in the presence of a catalyst of the formula V a P b U c O x wherein a and b are 0.5 to 3; c is 0.1 to 0.5; and x is the number of oxygens to satisfy the valence requirements of the other elements present.
Claim 2
Dependent Claim
75 words
In the process for the production of maleic anhydride by the oxidation of n-butane with molecular oxygen in the vapor phase at a reaction temperature of 350°-600° C. in the presence of a catalyst of the formula V a P b U c O x wherein a and b are 0.5 to 3; c is 0.1 to 0.5; and x is the number of oxygens to satisfy the valence requirements of the other elements present.
References Cited (Backward Citations)
US2294130A
Cited
US2625519A
Cited
US3074969A
Cited
FR1601955A
Cited
DE2219603A1
Cited
US3867411A
Cited
US3888886A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-11 | 1980-07-12 | 1981-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-11 | 1984-07-12 | 1985-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-11 | 1988-07-12 | 1989-01-11 | $7700.00 | Window Closed / Lapsed |