US3293268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of maleic anhydride by oxidation of n-butane
Assignee: Princeton Chemical Research Inc
•
Filing: 1964-03-23
•
Granted: 1966-12-20
•
Expires: 1984-03-23
Abstract
No abstract record available.
Inventors
- 👤 Richard I Bergman
- 👤 Norman W Frisch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:27
CPC Classifications
B; B01; B01J; 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: 2
Claim 1
Independent Claim
206 words
A METHOD FOR THE PREPARATION OF MALEIC ANHYDRIDE, WHICH COMPRISES OXIDIZING A REACTENT CONSISTING ESSENTIALLY OF A SATURATED ALIPHATIC HYDROCARBON HAVING FROM 4 TO 10 CARBON ATOMS, AT TEMPERATURES OF FROM 500* TO 600*C., IN THE PRESENCE OF A PHOSPHORUS-VANADIUM-OXYGEN-CONTAINING COMPLEX CATALYST SELECTED FROM THE GROUP CONSISTING OF: (A) A CATALYST PREPARED BY REACTING PHOSPHORIC ACID WITH VANADIUM OXALATE IN AQUEOUS SOLUTION, AND DRYING AND HEATING THE REACTION PRODUCT AT TEMPERATURES OF FROM 300* TO 500*C., THE RESULTING MATERIAL CONTAINING FROM 1.0 TO 3.0 GRAM ATOMS OF PHOSPHROUS PER GRAM ATOM OF VANADIUM PERSENT THEREIN; (B) A CATALYST PREPARED BY REACTING PHOSPHORIC ACID WITH AMMONIUM META-VANADATE IN AQUEOUS SOLUTION, AND DRYING AND HEATING THE REACTION PRODUCT AT TEMPERATURES OF FROM 300* TO 500*C., THE RESULTING MATERIAL CONTAINING FROM 1.8 TO 2.2 GRAM ATOMS OF PHOSPHORUS PER GRAM ATOM OF VANADIUM PERCENT THEREIN; AND (C) A CATALYST PREPARED BY REACTING A PHOSPHROUS COMPOUND SELECTED FROM THE GROUP CONSISTING OF PHOSPHORIC ACID AND P2O5 WITH A VANADIUM COMPOUND IN AN AQUEOUS OF A HYDROGEN HALIDE, AND DRYING AND HEATING THE REACTION PRODUCT AT TEMPERATURES OF FROM 300* TO 500*C., THE RESULTING MATERIAL CONTAINING FROM 1.02 TO 1.5 GRAM ATOMS OF PHOSPHORUS PER GRAM ATOM OF VANADIUM PRESENT THEREIN.
Claim 2
Independent Claim
206 words
A METHOD FOR THE PREPARATION OF MALEIC ANHYDRIDE, WHICH COMPRISES OXIDIZING A REACTENT CONSISTING ESSENTIALLY OF A SATURATED ALIPHATIC HYDROCARBON HAVING FROM 4 TO 10 CARBON ATOMS, AT TEMPERATURES OF FROM 500* TO 600*C., IN THE PRESENCE OF A PHOSPHORUS-VANADIUM-OXYGEN-CONTAINING COMPLEX CATALYST SELECTED FROM THE GROUP CONSISTING OF: (A) A CATALYST PREPARED BY REACTING PHOSPHORIC ACID WITH VANADIUM OXALATE IN AQUEOUS SOLUTION, AND DRYING AND HEATING THE REACTION PRODUCT AT TEMPERATURES OF FROM 300* TO 500*C., THE RESULTING MATERIAL CONTAINING FROM 1.0 TO 3.0 GRAM ATOMS OF PHOSPHROUS PER GRAM ATOM OF VANADIUM PERSENT THEREIN; (B) A CATALYST PREPARED BY REACTING PHOSPHORIC ACID WITH AMMONIUM META-VANADATE IN AQUEOUS SOLUTION, AND DRYING AND HEATING THE REACTION PRODUCT AT TEMPERATURES OF FROM 300* TO 500*C., THE RESULTING MATERIAL CONTAINING FROM 1.8 TO 2.2 GRAM ATOMS OF PHOSPHORUS PER GRAM ATOM OF VANADIUM PERCENT THEREIN; AND (C) A CATALYST PREPARED BY REACTING A PHOSPHROUS COMPOUND SELECTED FROM THE GROUP CONSISTING OF PHOSPHORIC ACID AND P2O5 WITH A VANADIUM COMPOUND IN AN AQUEOUS OF A HYDROGEN HALIDE, AND DRYING AND HEATING THE REACTION PRODUCT AT TEMPERATURES OF FROM 300* TO 500*C., THE RESULTING MATERIAL CONTAINING FROM 1.02 TO 1.5 GRAM ATOMS OF PHOSPHORUS PER GRAM ATOM OF VANADIUM PRESENT THEREIN.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-19 | 1970-06-20 | 1970-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-19 | 1974-06-20 | 1974-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-19 | 1978-06-20 | 1978-12-20 | $7700.00 | Window Closed / Lapsed |