US4147661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of maleic anhydride and catalysts therefor
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1977-11-04
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Granted: 1979-04-03
•
Expires: 1997-11-04
Abstract
Abstract Catalysts for the oxidation of hydrocarbons to maleic anhydride comprise a phosphorus/vanadium mixed oxide promoted by tungsten antimony, niobium, and/or molybdenum, having a surface area of at least 10m2/g.
Inventors
- 👤 Raymond Higgins
- 👤 Graham J. Hutchings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:29
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/54; B; B01; B01J; B01J23/00; B01J23/002; B01J23/16; B01J23/24; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; B01J27/199; B01J2523/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
131 words
A catalyst for the production of maleic anhydride by the oxidation of a hydrocarbon, which comprises a phosphorus/vanadium mixed oxide with at least one promoter selected from the group consisting of tungsten, antimony, niobium, and molybdenum, the atomic ratio of vanadium to phosphorus being in the range 0.5:1 to 2:1 and the total atomic ratio of molybdenum, tungsten, antimony or niobium to vanadium being in the range 0.025:1 to 1:1, the surface area of the catalyst being at least 10 m 2 /g, wherein said catalyst comprises a phase having a characteristic powder x-ray diffraction pattern using copper Kα-radiation as follows: ______________________________________
Line position
d (Angstrom 2.0 degrees Intensity, I
______________________________________
6.3 14.2 10
4.8 18.5 7
3.9 23.0 100
3.13 28.5 58
2.98 30.0 29
2.65 33.8 7
______________________________________
.
Claim 2
Dependent Claim
131 words
A catalyst for the production of maleic anhydride by the oxidation of a hydrocarbon, which comprises a phosphorus/vanadium mixed oxide with at least one promoter selected from the group consisting of tungsten, antimony, niobium, and molybdenum, the atomic ratio of vanadium to phosphorus being in the range 0.5:1 to 2:1 and the total atomic ratio of molybdenum, tungsten, antimony or niobium to vanadium being in the range 0.025:1 to 1:1, the surface area of the catalyst being at least 10 m 2 /g, wherein said catalyst comprises a phase having a characteristic powder x-ray diffraction pattern using copper Kα-radiation as follows: ______________________________________
Line position
d (Angstrom 2.0 degrees Intensity, I
______________________________________
6.3 14.2 10
4.8 18.5 7
3.9 23.0 100
3.13 28.5 58
2.98 30.0 29
2.65 33.8 7
______________________________________
.
Claim 3
Dependent Claim
20 words
A catalyst as claimed in claim 1 in which the surface area is in the range 20-50 M 2 /g.
Claim 4
Dependent Claim
34 words
A process for the production of a catalyst as claimed in claim 1 which comprises precipitating the phosphorus/vanadium mixed oxide complex from an organic solvent in which W, Sb, Nb and Mo is present.
Claim 5
Dependent Claim
31 words
A process as claimed in claim 3 in which the precipitate is contacted during or after its formation with an acid stronger than phosphoric acid before separation of the organic solvent.
Claim 6
Dependent Claim
23 words
A process as claimed in claim 3 in which the tungsten, antimony, niobium and molybdenum is present in solution in the organic solvent.
Claim 7
Dependent Claim
27 words
A process as claimed in claim 3 in which the mechanical properties of the catalyst are improved by treating it with a suspension of an inert support.
References Cited (Backward Citations)
FR1425301A
Cited
FR1470581A
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US4065468A
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US3888886A
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US3864280A
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US4070397A
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US4070379A
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US4008179A
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US4045478A
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US4052417A
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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) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |