US3864280A
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Catalyst for a n-butane oxidation to maleic anhydride
Assignee: Chevron USA Inc
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Filing: 1972-10-24
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Granted: 1975-02-04
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Expires: 1992-10-24
Abstract
Abstract An improved vanadium-phosphorus mixed oxide is prepared by a unique method employing an organic medium. The substantial intrinsic surface area and the microcrystalline structure of the new oxide result in advantageous activity and selectivity effects in the catalyzed vapor phase oxidation of n-butane to maleic anhydride. These oxides are also useful for the production of acid anhydrides from suitable hydrocarbon feeds.
Inventors
- 👤 Ronald A Schneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:24
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/255; C07C51/265; B; B01; B01J; B01J23/00; B01J23/16; B01J23/32; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; C07C51/215; C07C51/25; C07C51/252; C07C51/31; C07C51/313
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
54 words
A composition as in claim 1 wherein: a. the average valence of the vanadium is in the range from about 4.1 to 4.4; b. the phosphorus to vanadium atomic ratio is in the range 1.0-1.5 to 1; and c. the intrinsic surface area is in the range 10 to 50 square meters per gram.
Claim 2
Dependent Claim
20 words
A composition as in claim 1 wherein said mixed oxide has a B-phase content in excess of about 25 percent.
Claim 3
Dependent Claim
22 words
A composition as in claim 2 wherein said mixed oxide has a B-phase content in the range from 50 to 100 percent.
Claim 4
Dependent Claim
10 words
A composition of claim 1 disposed upon an inert support.
Claim 5
Dependent Claim
23 words
A composition in accordance with claim 1 wherein the intrinsic surface area is in the range 10 to 50 square meters per gram.
Claim 6
Dependent Claim
64 words
A crystalline phosphorus-vanadium mixed oxide composition consisting essentially of pentavalent phosphorus, vanadium and oxygen, said vanadium having an average valence in the range from about plus 3.9 to plus 4.6, said oxide having a phosphorus to vanadium atomic ratio in the range from about 0.9-1.8 to 1, and an intrinsic surface area in the range from about 7 to 50 square meters per gram.
Claim 7
Dependent Claim
54 words
A composition as in claim 7 wherein: a. the average valence of the vanadium is in the range from about 4.1 to 4.4; b. the phosphorus to vanadium atomic ratio is in the range 1.0-1.5 to 1; and c. the intrinsic surface area is in the range 10 to 50 square meters per gram.
Claim 8
Dependent Claim
20 words
A composition as in claim 7 wherein said mixed oxide has a B-phase content in excess of about 25 percent.
Claim 9
Dependent Claim
22 words
A composition as in claim 8 wherein said mixed oxide has a B-phase content in the range from 50 to 100 percent.
Claim 10
Dependent Claim
10 words
A composition of claim 7 disposed upon an inert support.
Claim 11
Dependent Claim
30 words
A composition in accordance with claim 7 wherein the crystals of said composition have a unit cell of the dimensions a b about 19.2 A and c about 7.8 A.
Claim 12
Dependent Claim
120 words
A crystalline phosphorus-vanadium mixed oxide composition consisting essentially of pentavalent phosphorus, vanadium and oxygen, said vanadium having an average valence in the range from about plus 3.9 to plus 4.6, said oxide having a phosphorus to vanadium atomic ratio in the range from about 0.9-1.8 to 1, and an intrinsic surface area in the range from about 10 to 50 square meters per gram, said crystals exhibiting an X-ray powder diffraction pattern (CuK Alpha ) wHen mixed with Alpha -alumina in a 5 to 1 weight ratio of the mixed oxide to Alpha -alumina in which the ratio of intensities of the d 3.9 A line to the d 2.085 A line of the mixture is at least about 0.8.
Claim 13
Dependent Claim
17 words
A composition as in claim 13 wherein said ratio of intensities is in excess of about 1.6.
Claim 14
Dependent Claim
37 words
A composition as in claim 13 wherein said ratio is in excess of about 1.6 and said intrinsic surface area is about 23 square meters per gram and said phosphorus to vanadium atomic ratio is about 1.2.
Claim 15
Dependent Claim
36 words
A composition as in claim 15 wherein said phosphorus to vanadium atomic ratio is in the range 1.0-1.5 to 1 and said average valence of the vanadium is in the range from about 4.1 to 4.4.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |