US4049574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst and process for preparing maleic anhydride from C4 hydrocarbons
Assignee: Petro Tex Chemical Corp
•
Filing: 1976-03-17
•
Granted: 1977-09-20
•
Expires: 1996-03-17
Abstract
Abstract A catalyst complex useful for converting normal C4 hydrocarbons to maleic anhydride in vapor phase comprising as components vanadium, phosphorus, copper, an element selected from the group of Te, Zr, Ni, Ce, W, Pd, Ag, Mn, Cr, Zn, Mo, Re, Sm, La, Hf, Ta, Th, Co, U, and Sn, preferably with an alkali or alkaline earth metal.
Inventors
- 👤 Ralph O. Kerr
- 👤 Bruno J. Barone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:37
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/847; B01J23/8472; B01J23/89; B01J23/8933; B01J23/898; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/215
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
67 words
An improved vanadium-phosphorus-oxygen catalyst complex for the oxidation of n-C 4 hydrocarbons to produce maleic anhydride consisting essentially of active components in the atom ratio, vanadium 1:phosphorus 0.90 to 1.3:copper 0.005 to 0.3:Me 0.005 to 0.25 wherein Me consists essentially of Pd and further containing as an active component an alkali or alkaline earth metal in the atom ratio of 0.001 to 0.1 per atom of V.
Claim 2
Dependent Claim
67 words
An improved vanadium-phosphorus-oxygen catalyst complex for the oxidation of n-C 4 hydrocarbons to produce maleic anhydride consisting essentially of active components in the atom ratio, vanadium 1:phosphorus 0.90 to 1.3:copper 0.005 to 0.3:Me 0.005 to 0.25 wherein Me consists essentially of Pd and further containing as an active component an alkali or alkaline earth metal in the atom ratio of 0.001 to 0.1 per atom of V.
Claim 3
Dependent Claim
67 words
An improved vanadium-phosphorus-oxygen catalyst complex for the oxidation of n-C 4 hydrocarbons to produce maleic anhydride consisting essentially of active components in the atom ratio, vanadium 1:phosphorus 0.90 to 1.3:copper 0.005 to 0.3:Me 0.005 to 0.25 wherein Me consists essentially of Hf and further containing as an active component an alkali or alkaline earth metal in the atom ratio of 0.001 to 0.1 per atom of V.
Claim 4
Dependent Claim
67 words
An improved vanadium-phosphorus-oxygen catalyst complex for the oxidation of n-C 4 hydrocarbons to produce maleic anhydride consisting essentially of active components in the atom ratio, vanadium 1:phosphorus 0.90 to 1.3:copper 0.005 to 0.3:Me 0.005 to 0.25 wherein Me consists essentially of Hf and further containing as an active component an alkali or alkaline earth metal in the atom ratio of 0.001 to 0.1 per atom of V.
Claim 5
Dependent Claim
42 words
An improved vanadium-phosphorus-oxygen catalyst complex for the oxidation of n-C 4 hydrocarbons to produce maleic anhydride consisting essentially of active components in the atom ratios vanadium 1:phosphorus 0.90 to 1.3:copper 0.005 to 0.3:Me 0.005 to 0.25 wherein Me consists essentially of Th.
Claim 6
Dependent Claim
42 words
An improved vanadium-phosphorus-oxygen catalyst complex for the oxidation of n-C 4 hydrocarbons to produce maleic anhydride consisting essentially of active components in the atom ratios vanadium 1:phosphorus 0.90 to 1.3:copper 0.005 to 0.3:Me 0.005 to 0.25 wherein Me consists essentially of Th.
References Cited (Backward Citations)
US3086026A
Cited
US3156706A
Cited
US3156705A
Cited
US3238254A
Cited
US3385796A
Cited
US3433823A
Cited
US3478063A
Cited
US3484384A
Cited
US3736354A
Cited
US3557021A
Cited
US3980585A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |