Patent US3907707A successfully refreshed from Google Patents.
US3907707A
Expired / Lapsed
US
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Vanadium catalysts made with a trivalent phosphorus compound
Assignee: Monsanto Co
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Filing: 1973-03-19
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Granted: 1975-09-23
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Expires: 1993-03-19
Abstract
Abstract An improved process was found for preparing a vanadiumcontaining catalyst wherein a tetravalent vanadium compound is provided from a pentavalent vanadium compound, comprising contacting the pentavalent vanadium compound with a trivalent phosphorus compound. The improved process is exemplified by the preparation of phosphorus-vanadium-oxygen catalysts, and particularly the preparation of phosphorus-vanadium-oxygen catalysts having a phosphorus to vanadium atom ratio of about 1:2 to about 2:1 comprising contacting a vanadium compound with a trivalent phosphorus compound, recovering a phosphorus-vanadiumoxygen precursor, and thereafter, calcining the precursor to form the catalysts. Phosphorous acid is preferred as the trivalent phosphorus compound.
Inventors
- 👤 Harold Raffelson
- 👤 Roberto Lee
- 👤 Thomas J Dolan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:38
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; B; B01; B01J; B01J23/00; B01J23/16; B01J23/20; B01J23/22; B01J37/00; B01J37/28; C01; C01G; C01G31/00; C07C51/215; C07C51/252
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
48 words
IN A PROCESS FOR PREPARING A PHOSPHORUS-VANADIUM-OXYGEN CATALYST WHEREIN A PENTAVALENT VANDIUM COMPOUND IS CONTACTED WITH A PHOSPHORUS COMPOUND UNDER CONDITIONS TO PROVIDE A SUBSTANTIAL AMOUNT OF TETRAVALENT VANADIUM AND TO FORM A PHOSPHROUS-VANADIUM-OXYGEN PRECURSOR, THE IMPROVEMENT COMPOUND CONTACTING THE PENTAVALENT VANADIUM COMPOUND WITH A TRIVALENT PHOSPHORUS COMPOUND.
Claim 2
Dependent Claim
48 words
IN A PROCESS FOR PREPARING A PHOSPHORUS-VANADIUM-OXYGEN CATALYST WHEREIN A PENTAVALENT VANDIUM COMPOUND IS CONTACTED WITH A PHOSPHORUS COMPOUND UNDER CONDITIONS TO PROVIDE A SUBSTANTIAL AMOUNT OF TETRAVALENT VANADIUM AND TO FORM A PHOSPHROUS-VANADIUM-OXYGEN PRECURSOR, THE IMPROVEMENT COMPOUND CONTACTING THE PENTAVALENT VANADIUM COMPOUND WITH A TRIVALENT PHOSPHORUS COMPOUND.
Claim 3
Dependent Claim
19 words
In a process of claim 1 wherein the phosphorus to vanadium atom ratio is about 1:1 to about 2:1.
Claim 4
Dependent Claim
19 words
In a process of claim 1 wherein the phosphorus to vanadium atom ratio is about 1:1 to about 1.1:1.
Claim 5
Dependent Claim
16 words
In a process of claim 1 wherein the phosphorus to vanadium atom ratio is about 1.1:1.
Claim 6
Dependent Claim
24 words
In a process of claim 1 wherein the amount of trivalent phosphorus compound is at least the stoichiometric amount required to provide tetravalent vanadium.
Claim 7
Dependent Claim
15 words
In a process of claim 1 wherein the travalent phosphorus compound is a phosphorous acid.
Claim 8
Dependent Claim
14 words
In a process of claim 1 wherein the trivalent phosphorus compound is orthophosphorous acid.
Claim 9
Dependent Claim
42 words
In a process of claim 1 which comprises contacting a vanadium compound with a trivalent phosphorus compound, and heating the vanadium compound and the phosphorus compound in a closed system at above 100*C for a time sufficient to form a phosphorus-vanadium-oxygen precursor.
Claim 10
Dependent Claim
21 words
In a process of claim 1 wherein the pentavalent vanadium compound is contacted with phosphorus trichloride in the presence of water.
Claim 11
Dependent Claim
33 words
In a process of claim 1 wherein the catalyst has a phosphorus to vanadium atom ratio from about 1:2 to about 2:1 prepared by contacting vanadium pentoxide with phosphoric acid and phosphorous acid.
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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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |