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US4563439A
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Preparation of mixed vanadium phosphorus oxide catalysts
Assignee: Standard Oil Co
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Filing: 1984-08-14
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Granted: 1986-01-07
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Expires: 2004-08-14
Abstract
Abstract Vanadium phosphorus mixed oxide containing catalysts are prepared by sequentially forming an alpha-VOPO4 catalyst precursor in aqueous media, and thereafter partially reducing a portion of the vanadium to a valence state of +4 in an organic liquid reducing media, in the absence of corrosive reducing agents. The catalysts exhibit excellent activity for the production of maleic anhydride from 4 carbon atom hydrocarbons such as n-butane.
Inventors
- 👤 Noel J. Bremer
- 👤 Dennis E. Dria
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:33
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/215; B; B01; B01J; B01J23/00; B01J23/002; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; B01J2523/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
94 words
A vanadium/phosphorus mixed oxide catalyst precursor composition prepared by contacting and heating in an aqueous medium a pentavalent vanadium compound with phosphoric acid and forming a substantially pentavalent, alpha VOPO 4 catalyst precursor in the aqueous medium, wherein the aqueous medium is free from agents which would substantially reduce the pentavalent, alpha VOPO 4 catalyst precursor, recovering the pentavalent catalyst precursor from the aqueous medium and introducing the pentavalent catalyst precursor into a substantially organic liquid medium capable of reducing at least a portion of the vanadium to a valence state of about +4.
Claim 2
Dependent Claim
94 words
A vanadium/phosphorus mixed oxide catalyst precursor composition prepared by contacting and heating in an aqueous medium a pentavalent vanadium compound with phosphoric acid and forming a substantially pentavalent, alpha VOPO 4 catalyst precursor in the aqueous medium, wherein the aqueous medium is free from agents which would substantially reduce the pentavalent, alpha VOPO 4 catalyst precursor, recovering the pentavalent catalyst precursor from the aqueous medium and introducing the pentavalent catalyst precursor into a substantially organic liquid medium capable of reducing at least a portion of the vanadium to a valence state of about +4.
Claim 3
Dependent Claim
15 words
A catalyst precursor composition of claim 1 wheein said organic liquid medium comprises an alcohol.
Claim 4
Dependent Claim
14 words
A catalyst precursor composition of claim 1 wherein said organic liquid medium comprises isobutanol.
Claim 5
Dependent Claim
98 words
A process for making a vanadium/phosphorus mixed oxide catalyst precursor composition prepared by contacting and heating in an aqueous medium a pentavalent vanadium compound with phosphoric acid and forming a substantially pentavalent, alpha VOPO 4 catalyst precursor in the aqueous medium, wherein the aqueous medium is free from agents which would substantially reduce the pentavalent, alpha VOPO 4 catalyst precursor, recovering the pentavalent catalyst precursor from the aqueous medium and introducing the pentavalent catalyst precursor into a substantially organic liquid medium capable of reducing at least a portion of the vanadium to a valence state of about +4.
Claim 6
Dependent Claim
98 words
A process for making a vanadium/phosphorus mixed oxide catalyst precursor composition prepared by contacting and heating in an aqueous medium a pentavalent vanadium compound with phosphoric acid and forming a substantially pentavalent, alpha VOPO 4 catalyst precursor in the aqueous medium, wherein the aqueous medium is free from agents which would substantially reduce the pentavalent, alpha VOPO 4 catalyst precursor, recovering the pentavalent catalyst precursor from the aqueous medium and introducing the pentavalent catalyst precursor into a substantially organic liquid medium capable of reducing at least a portion of the vanadium to a valence state of about +4.
Claim 7
Dependent Claim
22 words
A process as in claim 4 wherein said organic liquid is selected from alcohols, ethers, glycols, ketones, halogenated olefins, and mixtures thereof.
Claim 8
Dependent Claim
31 words
A process as in claim 4 wherein said organic liquid is selected from isopropanol, isobutanol, sec-butanol, allyl alcohol, crotyl alcohol, acetaldehyde, methyl ethyl ketone, ethylene glycol, dibutyl ether, hexachlorobutadiene and perchloropropene.
Claim 9
Dependent Claim
13 words
A process as in claim 4 wherein said organic liquid comprises an alcohol.
Claim 10
Dependent Claim
11 words
A process as in claim 4 wherein said alcohol comprises isobutanol.
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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) | 1989-01-06 | 1989-07-08 | 1990-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-06 | 1993-07-08 | 1994-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-06 | 1997-07-08 | 1998-01-07 | $7700.00 | Window Closed / Lapsed |