US3862146A
Expired / Lapsed
US
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Oxidation of butane to maleic anhydride
Assignee: Standard Oil Co
•
Filing: 1972-10-27
•
Granted: 1975-01-21
•
Expires: 1992-10-27
Abstract
Abstract The oxidation of butane to maleic anhydride in the presence of a phosphorus-vanadium-oxygen complex catalyst is enhanced by the addition to the catalyst of a zinc, bismuth, copper or lithium activator. The yield of the oxidation may be increased as much as 50% without any loss in selectivity to maleic anhydride.
Inventors
- 👤 Edward M Boghosian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:20
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: 11
Claim 1
Independent Claim
10 words
The process of claim 1 wherein the activator is zinc.
Claim 2
Dependent Claim
10 words
The process of claim 1 wherein the activator is bismuth.
Claim 3
Dependent Claim
10 words
The process of claim 1 wherein the activator is copper.
Claim 4
Dependent Claim
10 words
The process of claim 1 wherein the activator is lithium.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein from 0.1 to 0.35 atoms of the activator is present for each atom of vanadium.
Claim 6
Dependent Claim
20 words
The process of claim 1 wherein there is one to two atoms of phosphorus present for each atom of vanadium.
Claim 7
Dependent Claim
14 words
The process of claim 1 wherein the temperature is from 300* to 650* C.
Claim 8
Dependent Claim
15 words
The process of claim 1 wherein the contact time is from 0.05 to 5.0 seconds.
Claim 9
Dependent Claim
22 words
The process of claim 1 wherein a fixed bed catalyst is used and the feedstock contains 0.1 to 4.0 mole percent butane.
Claim 10
Dependent Claim
15 words
The process of claim 10 wherein the feedstock contains 0.5 to 1.6 mole percent butane.
Claim 11
Dependent Claim
22 words
The process of claim 1 wherein a fluid bed catalyst is used and the feedstock contains 1 to 20 mole percent butane.
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) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |