Patent US4220595A successfully refreshed from Google Patents.
US4220595A
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Oxidation of butane to maleic anhydride
Assignee: Sun Ventures Inc
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Filing: 1973-10-17
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Granted: 1980-09-02
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Expires: 1993-10-17
Abstract
Abstract A catalyst comprising A--V--P, where A is an alkaline earth metal, has been found to be effective in the oxidation of butane to maleic anhydride. The catalyst may be employed in combination with an inert support such as TiO 2 . This catalyst is characterized in having high selectivity and stability over extended periods of time.
Inventors
- 👤 Alan F. Dickason
- 👤 Wesley R. Cherry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:34
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; B01J23/00; B01J23/16; B01J23/20; B01J23/22; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/215
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
116 words
A process for the vapor phase oxidation of butane to form maleic anhydride which comprises reacting butane with air or oxygen at a temperature of about 500°-650° C. in the presence of a catalyst composition consisting essentially of (a) vanadium, phosphorous, oxygen and at least one alkaline earth metal selected from the group consisting of calcium, magnesium, and barium, wherein said catalyst contains from about 5-50 mole percent vanadium, 5-80 mole percent phosphorous, and from about 1-50 mole percent of said alkaline earth metal, based on the total metals of the compositon, (b) said catalyst optionally containing a carrier, and the mole ratio of butane to oxygen in the feed stream is no greater than 1:4.
Claim 2
Dependent Claim
116 words
A process for the vapor phase oxidation of butane to form maleic anhydride which comprises reacting butane with air or oxygen at a temperature of about 500°-650° C. in the presence of a catalyst composition consisting essentially of (a) vanadium, phosphorous, oxygen and at least one alkaline earth metal selected from the group consisting of calcium, magnesium, and barium, wherein said catalyst contains from about 5-50 mole percent vanadium, 5-80 mole percent phosphorous, and from about 1-50 mole percent of said alkaline earth metal, based on the total metals of the compositon, (b) said catalyst optionally containing a carrier, and the mole ratio of butane to oxygen in the feed stream is no greater than 1:4.
Claim 3
Dependent Claim
143 words
A process for the vapor phase oxidation of butane to form maleic anhydride which comprises reacting butane with oxygen or air at temperatures of from about 500° C. to 650° C. in the presence of a catalyst composition consisting essentially of vanadium, phosphorus, and an alkaline earth metal selected from the group consisting of calcium, magnesium and barium, wherein said catalyst contains from about 5 to 50 mole percent vanadium, 5 to 80 mole percent phosphorus, and from about 1 to 50 mole percent of said alkaline earth metal, based on the total metals of the composition, wherein said catalyst composition is supported on TiO 2 , and wherein the contact time of the butane with the catalyst is from about 0.01 to 10 seconds and the mole ratio of butane to oxygen in the feed stream is no greater than about 1:10.
Claim 4
Dependent Claim
143 words
A process for the vapor phase oxidation of butane to form maleic anhydride which comprises reacting butane with oxygen or air at temperatures of from about 500° C. to 650° C. in the presence of a catalyst composition consisting essentially of vanadium, phosphorus, and an alkaline earth metal selected from the group consisting of calcium, magnesium and barium, wherein said catalyst contains from about 5 to 50 mole percent vanadium, 5 to 80 mole percent phosphorus, and from about 1 to 50 mole percent of said alkaline earth metal, based on the total metals of the composition, wherein said catalyst composition is supported on TiO 2 , and wherein the contact time of the butane with the catalyst is from about 0.01 to 10 seconds and the mole ratio of butane to oxygen in the feed stream is no greater than about 1:10.
Claim 5
Dependent Claim
13 words
The process according to claim 2 wherein the alkaline earth metal is calcium.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-02 | 1984-03-03 | 1984-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-02 | 1988-03-03 | 1988-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-02 | 1992-03-03 | 1992-09-02 | $7700.00 | Window Closed / Lapsed |