US3697550A
Expired / Lapsed
US
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Vapour phase oxidation of benzene to maleic anhydride using an aluminum phosphate supported catalyst
Assignee: Evonik LIL Ltd
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Filing: 1970-12-17
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Granted: 1972-10-10
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Expires: 1990-12-17
Abstract
Abstract This invention relates to the use of a support of aluminium phosphate in the cristobalite form in a process for the vapor phase oxidation of benzene to maleic anhydride in which a gaseous mixture containing benzene and oxygen with an inert diluent gas is contacted at a temperature in the range of 350* to 450* C with the supported catalyst, whose catalyst component, present to the extent of between 5 and 30 percent by weight in the supported catalyst, comprises two or more of vanadium oxide, molybdenum oxide, tungsten oxide and phosphorus oxide.
Inventors
- 👤 John Bayne
- 👤 Ian Robert King
- 👤 John Richard Morey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:24
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/31; C07C51/313; B; B01; B01J; B01J23/00; B01J23/002; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; B01J27/199; B01J2523/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
28 words
A process as claimed in claim 1 in which the catalyst component comprises molybdenum oxide and vanadium oxide in the weight ratio of from 1:3 to 4:1 respectively.
Claim 2
Dependent Claim
25 words
A process as claimed in claim 2 in which the catalyst component comprises molybdenum oxide and vanadium oxide in the weight ratio of about 2:1.
Claim 3
Dependent Claim
42 words
A process as claimed in claim 1 in which the catalyst component comprises molybdenum oxide and vanadium oxide with phosphorus oxide such that the weight ratio of the sum of molybdenum oxide and vanadium oxide to phosphorus oxide is greater than 1:1.
Claim 4
Dependent Claim
22 words
A process as claimed in claim 4 in which the said weight ratio is in the range of from 2:1 to 50:1.
Claim 5
Dependent Claim
28 words
A process as claimed in claim 1 in which the weight of the catalyst component is between 5 and 30 percent of the weight of the supported catalyst.
Claim 6
Dependent Claim
28 words
A process as claimed in claim 6 in which the weight of the catalyst component is between 10 and 20 percent of the weight of the supported catalyst.
Claim 7
Dependent Claim
20 words
A process as claimed in claim 1 in which the said gaseous mixture also contains one or more diluent gases.
Claim 8
Dependent Claim
17 words
A process as claimed in claim 8 in which the said gaseous mixture comprises benzene and air.
Claim 9
Dependent Claim
23 words
A process as claimed in claim 1 in which the said elevated temperatures is within the range of from 350* to 450* C.
References Cited (Backward Citations)
US2967185A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |