Patent US6208549B1 successfully refreshed from Google Patents.
US4429136A
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US
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Manufacture of maleic anhydride
Assignee: Ashland LLC
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Filing: 1982-11-22
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Granted: 1984-01-31
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Expires: 2002-11-22
Abstract
Abstract A process for the oxidation of n-butane, n-butenes, 1,3-butadiene and mixtures thereof to maleic anhydride in the vapor phase over a catalyst having the empirical formula CuaPbMncModOx wherein a is 0.001 to 1.0, b is 0.01 to 2.0, c is 0.001 to 2.0, d is 1.0 to 20.0, and x is a number which satisfies the unshared valences of the other elements in the formula is described.
Inventors
- 👤 Chelliah Daniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:46
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/215; C07C51/252
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
97 words
The process for production of maleic anhydride comprising the oxidation of n-butane, n-butenes, 1,3-butadiene or mixtures thereof with molecular oxygen in the vapor phase at a temperature in the range of from about 360° C. to 500° C. in the presence of a catalyst having the empirical formula Cu a P b Mn c Mo d O x wherein a is 0.001 to 1.0, b is 0.01 to 2.0, c is 0.001 to 2.0, d is 1.0 to 20.0, and x is a number which satisfies the unshared positive valences of the other elements in the formula.
Claim 2
Dependent Claim
97 words
The process for production of maleic anhydride comprising the oxidation of n-butane, n-butenes, 1,3-butadiene or mixtures thereof with molecular oxygen in the vapor phase at a temperature in the range of from about 360° C. to 500° C. in the presence of a catalyst having the empirical formula Cu a P b Mn c Mo d O x wherein a is 0.001 to 1.0, b is 0.01 to 2.0, c is 0.001 to 2.0, d is 1.0 to 20.0, and x is a number which satisfies the unshared positive valences of the other elements in the formula.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein n-butane is oxidized to maleic anhydride.
Claim 4
Dependent Claim
15 words
The process of claim 2 wherein the molecular oxygen is in the form of air.
Claim 5
Dependent Claim
27 words
The process of claim 2 wherein the catalyst has the empirical formula Cu 0 .5 P 3 .0 Mn 0 .58 Mo 10 .0 O x .
References Cited (Backward Citations)
US4093635A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-30 | 1987-08-01 | 1988-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-30 | 1991-08-01 | 1992-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-30 | 1995-08-01 | 1996-01-31 | $7700.00 | Window Closed / Lapsed |