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US4560674A
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Catalysts for the production of maleic anhydride
Assignee: Huntsman Corp
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Filing: 1983-12-28
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Granted: 1985-12-24
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Expires: 2003-12-28
Abstract
Abstract Catalysts useful for the partial oxidation of non-aromatic hydrocarbons, particularly n-butane, with molecular oxygen or a molecular oxygen-containing gas in the vapor phase to produce maleic anhydride are provided which comprise mixed oxides of phosphorus and vanadium. The catalysts are highly effective in that they exhibit a weight/weight productivity of at least 70 grams of maleic anhydride per kilogram of catalyst per hour.
Inventors
- 👤 James T. Wrobleski
- 👤 James W. Edwards
- 👤 Charles R. Graham
- 👤 Robert A. Keppel
- 👤 Harold Raffelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:43
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/002; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/215; C07C51/25; C07C51/252; C07C51/31; C07C51/313; B01J2523/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
139 words
A catalyst composition for the production of maleic anhydride by the partial oxidation of nonaromatic hydrocarbons which comprises the mixed oxides of phosphorus and vanadium, which catalyst (a) is characterized by (i) an average valence state of vanadium from about +3.9 to about +4.6, (ii) a phosphorus/vanadium atom ratio of about 0.5 to about 2.0, and (iii) a macrostructure predominantly comprising generally spheroidal particles consisting of radially oriented three-dimensional networks of randomly shaped open cells, and (b) exhibits a weight/weight productivity to maleic anhydride of at least 70 g MAN/kg cat.-hr based upon a performance test conducted at a concentration of 1.5 mole percent hydrocarbon-in-air, a space velocity of 1450 hr -1 under a pressure of 1.055×10 2 kPa-G, and a temperature sufficient to maintain the hydrocarbon conversion within the range of 70 mole percent to 90 mole percent.
Claim 2
Dependent Claim
139 words
A catalyst composition for the production of maleic anhydride by the partial oxidation of nonaromatic hydrocarbons which comprises the mixed oxides of phosphorus and vanadium, which catalyst (a) is characterized by (i) an average valence state of vanadium from about +3.9 to about +4.6, (ii) a phosphorus/vanadium atom ratio of about 0.5 to about 2.0, and (iii) a macrostructure predominantly comprising generally spheroidal particles consisting of radially oriented three-dimensional networks of randomly shaped open cells, and (b) exhibits a weight/weight productivity to maleic anhydride of at least 70 g MAN/kg cat.-hr based upon a performance test conducted at a concentration of 1.5 mole percent hydrocarbon-in-air, a space velocity of 1450 hr -1 under a pressure of 1.055×10 2 kPa-G, and a temperature sufficient to maintain the hydrocarbon conversion within the range of 70 mole percent to 90 mole percent.
Claim 3
Dependent Claim
20 words
The catalyst composition of claim 1 wherein the catalyst has a phosphorus/vanadium atom ratio from about 0.95 to about 1.2.
Claim 4
Dependent Claim
26 words
The catalyst composition of claim 1 wherein the catalyst has an intrinsic surface area of about 10 m 2 /g to about 40 m 2 /g.
Claim 5
Dependent Claim
27 words
The catalyst composition of claim 1 wherein the hydrocarbon conversion during the performance test is maintained within the range of 78 mole percent to 80 mole percent.
Claim 6
Dependent Claim
23 words
The catalyst composition of claim 1 wherein the performance test is conducted at a temperature from about 300° C. to about 600° C.
Claim 7
Dependent Claim
23 words
The catalyst composition of claim 5 wherein the performance test is conducted at a temperature of about 325° C. to about 425° C.
References Cited (Backward Citations)
US3864280A
Cited
US4187235A
Cited
US4132670A
Cited
DE2727617A1
Cited
US4172084A
Cited
US4219484A
Cited
US4251390A
Cited
US4253988A
Cited
US4312787A
Cited
US4276222A
Cited
US4294722A
Cited
US4333853A
Cited
US4350639A
Cited
US4293498A
Cited
US4315864A
Cited
US4374043A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-23 | 1989-06-24 | 1989-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-23 | 1993-06-24 | 1993-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-23 | 1997-06-24 | 1997-12-24 | $7700.00 | Window Closed / Lapsed |