US4071539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing maleic anhydride from C4 hydrocarbons
Assignee: Citicorp North America Inc
•
Filing: 1976-03-17
•
Granted: 1978-01-31
•
Expires: 1996-03-17
Abstract
Abstract A catalyst complex useful for converting normal C 4 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 Sr, 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
2026-11-08 01:51
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/215; B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/89; B01J23/8933; B01J23/898; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; C07C51/25; C07C51/252
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
64 words
A process for the production of maleic anhydride comprising contacting a feed of normal C 4 hydrocarbons comprising at least 90 mol percent n-butane in vapor phase at elevated temperatures with oxygen and a catalyst complex consisting essentially of vanadium, phosphorus, copper and Ce as the active components in the atom ratios, vanadium 1: phosphorus 0.90 to 1.3:copper 0.005 to 0.3:Ce 0.005 to 0.25.
Claim 2
Dependent Claim
64 words
A process for the production of maleic anhydride comprising contacting a feed of normal C 4 hydrocarbons comprising at least 90 mol percent n-butane in vapor phase at elevated temperatures with oxygen and a catalyst complex consisting essentially of vanadium, phosphorus, copper and Ce as the active components in the atom ratios, vanadium 1: phosphorus 0.90 to 1.3:copper 0.005 to 0.3:Ce 0.005 to 0.25.
Claim 3
Dependent Claim
15 words
The process according to claim 1 wherein said catalyst complex is deposited on a carrier.
Claim 4
Dependent Claim
25 words
The process according to claim 2 wherein said catalyst complex comprises 50 to 95 percent by weight of the total of catalyst complex and carrier.
Claim 5
Dependent Claim
17 words
The process according to claim 2 wherein said feed is a mixture of n-butane, n-butene and butadiene.
Claim 6
Dependent Claim
73 words
A process for the production of maleic anhydride comprising contacting a feed of normal C 4 hydrocarbons in vapor phase at elevated temperatures with oxygen and a catalyst complex consisting essentially of vanadium, phosphorus, copper, tellurium, cerium, and an alkali or alkaline earth metal, as the active components, in the atom ratios vanadium 1:phosphorus 0.90 to 1.3:copper 0.005 to 0.3:tellurium plus cerium 0.005 to 0.25: alkali or alkaline earth metal 0.001 to 0.1.
Claim 7
Dependent Claim
73 words
A process for the production of maleic anhydride comprising contacting a feed of normal C 4 hydrocarbons in vapor phase at elevated temperatures with oxygen and a catalyst complex consisting essentially of vanadium, phosphorus, copper, tellurium, cerium, and an alkali or alkaline earth metal, as the active components, in the atom ratios vanadium 1:phosphorus 0.90 to 1.3:copper 0.005 to 0.3:tellurium plus cerium 0.005 to 0.25: alkali or alkaline earth metal 0.001 to 0.1.
Claim 8
Dependent Claim
18 words
The process according to claim 5 wherein the alkali or alkaline metal is Li, Na, Mg or Ba.
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) | 1981-01-30 | 1981-08-01 | 1982-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-30 | 1985-08-01 | 1986-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-30 | 1989-08-01 | 1990-01-31 | $7700.00 | Window Closed / Lapsed |