Patent US3899516A successfully refreshed from Google Patents.
US3899516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation of butane to maleic anhydride using butane-rich feed
Assignee: Sun Ventures Inc
•
Filing: 1973-10-17
•
Granted: 1975-08-12
•
Expires: 1993-10-17
Abstract
Abstract In the oxidation of n-butane to maleic anhydride using a variety of catalysts, a substantial improvement in the selectivity for maleic anhydride is obtained when the mole ratio of butane to oxygen is greater than 1:4.
Inventors
- 👤 Alan F Dickason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:49
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/88; B01J23/887; B01J23/8876; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/215; B01J2523/00
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
57 words
IN A PROCESS FOR THE CATALYTIC VAPOR PHASE OXIDATION OF BUTANE TO FORM MALEIC ANHYDRIDE, THE IMPROVEMENT WHEREIN THE OXIDANT IS SUBSTANTIALLY PURE OXYGEN, THE RATIO OF BUTANE TO OXYGEN IS GREATER THAN ABOUT 1:4, AND THE CATALYST IS A VANADIUM-PHOSPHORUS CATALYST CONTAINING A THIRD METAL COMPONENT SELECTED FROM THE GROUP CONSISTING OF CALCIUM, BARIUM, AND MAGNESIUM.
Claim 2
Dependent Claim
57 words
IN A PROCESS FOR THE CATALYTIC VAPOR PHASE OXIDATION OF BUTANE TO FORM MALEIC ANHYDRIDE, THE IMPROVEMENT WHEREIN THE OXIDANT IS SUBSTANTIALLY PURE OXYGEN, THE RATIO OF BUTANE TO OXYGEN IS GREATER THAN ABOUT 1:4, AND THE CATALYST IS A VANADIUM-PHOSPHORUS CATALYST CONTAINING A THIRD METAL COMPONENT SELECTED FROM THE GROUP CONSISTING OF CALCIUM, BARIUM, AND MAGNESIUM.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the catalyst is supported on TiO2.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein the mole ratio of butane to oxygen is from about 1:1 to 20:1.
Claim 5
Dependent Claim
57 words
In a process for the catalytic vapor phase oxidation of butane to maleic anhydride, the improvement wherein the oxidant is substantially pure oxygen, the ratio of butane to oxygen is greater than about 1:4, and the catalyst is an antimony-molybdenum catalyst containing a third metal component selected from the group consisting of nickel, cobalt, copper, and zinc.
Claim 6
Dependent Claim
57 words
In a process for the catalytic vapor phase oxidation of butane to maleic anhydride, the improvement wherein the oxidant is substantially pure oxygen, the ratio of butane to oxygen is greater than about 1:4, and the catalyst is an antimony-molybdenum catalyst containing a third metal component selected from the group consisting of nickel, cobalt, copper, and zinc.
Claim 7
Dependent Claim
19 words
The process of claim 4 wherein the mole ratio of butane to oxygen is from about 1:1 to 20:1.
Claim 8
Dependent Claim
56 words
In the process for the catalytic vapor phase oxidation of butane to maleic anhydride, the improvement wherein the oxidant is substantially pure oxygen, the ratio of butane to oxygen is greater than about 1:4, and the catalyst is a vanadium-phosphorus catalyst containing a third metal component selected from the group consisting of iron, cobalt, and nickel.
Claim 9
Dependent Claim
56 words
In the process for the catalytic vapor phase oxidation of butane to maleic anhydride, the improvement wherein the oxidant is substantially pure oxygen, the ratio of butane to oxygen is greater than about 1:4, and the catalyst is a vanadium-phosphorus catalyst containing a third metal component selected from the group consisting of iron, cobalt, and nickel.
Claim 10
Dependent Claim
15 words
The process of claim 6 wherein the catalyst contains a fourth metal component comprising tungsten.
Claim 11
Dependent Claim
12 words
The process of claim 6 wherein the catalyst is supported on TiO2.
Claim 12
Dependent Claim
12 words
The process of claim 7 wherein the catalyst is supported on TiO2.
Claim 13
Dependent Claim
19 words
The process of claim 6 wherein the mole ratio of butane to oxygen is from about 1:1 to 20:1.
Claim 14
Dependent Claim
41 words
In the process for the catalytic vapor phase oxidation of butane to maleic anhydride, the improvement wherein the oxidant is substantially pure oxygen, the ratio of butane to oxygen is greater than about 1:4, and the catalyst is a cobalt-molybdenum catalyst.
Claim 15
Dependent Claim
41 words
In the process for the catalytic vapor phase oxidation of butane to maleic anhydride, the improvement wherein the oxidant is substantially pure oxygen, the ratio of butane to oxygen is greater than about 1:4, and the catalyst is a cobalt-molybdenum catalyst.
Claim 16
Dependent Claim
19 words
The process of claim 9 wherein the mole ratio of butane to oxygen is from about 1:1 to 20:1.
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) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |