US4396536A
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US
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Preparation of vanadium phosphorous catalysts using olefinic oxygenated media
Assignee: Standard Oil Co
•
Filing: 1981-09-14
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Granted: 1983-08-02
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Expires: 2001-09-14
Abstract
Abstract The present invention provides a process for the preparation of oxidation catalysts containing mixed oxides of vanadium and phosphorus, which catalysts are particularly effective in the oxidation of n-butane, n-butenes, 1,3-butadiene or a mixture thereof with molecular oxygen or an oxygen-containing gas in the vapor phase to produce high yields of maleic anhydride with good selectivity. A vanadium compound is introduced into an olefinic oxygenated organic liquid medium, a phosphorus-containing compound is added to the medium, reduction of at least a portion of the vanadium to a +4 valence state is effected either prior to or subsequent to the addition of the phosphorus-containing compound, and the resulting vanadium-phosphorus oxide catalyst precursor is recovered, dried and calcined.
Inventors
- 👤 Noel J. Bremer
- 👤 Dennis E. Dria
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:56
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252; B; B01; B01J; B01J23/00; B01J23/002; B01J23/16; B01J23/20; B01J23/22; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; C07C51/215; B01J2523/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
94 words
A process for the preparation of oxidation catalysts containing the mixed oxides of vanadium and phosphorus which comprises (a) introducing a pentavalent vanadium-containing compound into an olefinic, oxygenated organic liquid-containing liquid medium, (b) effecting reduction of at least a portion of said vanadium to a valence state of about +4 in the absence of a corrosive reducing agent; (c) adding a phosphorus-containing compound to said medium prior to or subsequent to effecting said reduction to form a catalyst precursor; (d) recovering the catalyst precursor; (e) drying the catalyst precursor; (f) calcining the catalyst precursor.
Claim 2
Dependent Claim
94 words
A process for the preparation of oxidation catalysts containing the mixed oxides of vanadium and phosphorus which comprises (a) introducing a pentavalent vanadium-containing compound into an olefinic, oxygenated organic liquid-containing liquid medium, (b) effecting reduction of at least a portion of said vanadium to a valence state of about +4 in the absence of a corrosive reducing agent; (c) adding a phosphorus-containing compound to said medium prior to or subsequent to effecting said reduction to form a catalyst precursor; (d) recovering the catalyst precursor; (e) drying the catalyst precursor; (f) calcining the catalyst precursor.
Claim 3
Dependent Claim
21 words
A process as recited in claim 1 wherein said reduction of vanadium is effected in the presence of the phosphorus-containing compound.
Claim 4
Dependent Claim
87 words
A process for the preparation of an oxidation catalyst containing the mixed oxides of vanadium and phosphorus from at least one pentavalent vanadium-containing compound and at least one phosphorus-containing compound, wherein the pentavalent vanadium is reduced to an average valence state of about +3.5 to about +4.6, including the step of effecting reduction of at least a portion of the dispersed or solubilized pentavalent vanadium to a valence state of +4 in an olefinic, oxygenated organic liquid-containing liquid medium in the absence of a corrosive reducing agent.
Claim 5
Dependent Claim
87 words
A process for the preparation of an oxidation catalyst containing the mixed oxides of vanadium and phosphorus from at least one pentavalent vanadium-containing compound and at least one phosphorus-containing compound, wherein the pentavalent vanadium is reduced to an average valence state of about +3.5 to about +4.6, including the step of effecting reduction of at least a portion of the dispersed or solubilized pentavalent vanadium to a valence state of +4 in an olefinic, oxygenated organic liquid-containing liquid medium in the absence of a corrosive reducing agent.
Claim 6
Dependent Claim
117 words
A process for the preparation of oxidation catalysts containing the mixed oxides of vanadium and phosphorus which comprises (a) introducing a pentavalent vanadium-compound into an oxygenated organic liquid containing liquid medium capable of at least partially solubilizing the vanadium; (b) effecting reduction of at least a portion of said vanadium to a valence state of about +4 in the absence of a corrosive reducing agent; (c) removing unsolubilized vanadium-containing compounds having a particle size greater than about 0.1 mm diameter; (d) adding a pentavalent phosphorus-containing compound to the reaction medium resulting from step (c) to form a catalyst precursor precipitate; (e) recovering said catalyst precursor precipitate; (f) drying said catalyst precursor precipitate; and (g) calcining said precipitate.
Claim 7
Dependent Claim
117 words
A process for the preparation of oxidation catalysts containing the mixed oxides of vanadium and phosphorus which comprises (a) introducing a pentavalent vanadium-compound into an oxygenated organic liquid containing liquid medium capable of at least partially solubilizing the vanadium; (b) effecting reduction of at least a portion of said vanadium to a valence state of about +4 in the absence of a corrosive reducing agent; (c) removing unsolubilized vanadium-containing compounds having a particle size greater than about 0.1 mm diameter; (d) adding a pentavalent phosphorus-containing compound to the reaction medium resulting from step (c) to form a catalyst precursor precipitate; (e) recovering said catalyst precursor precipitate; (f) drying said catalyst precursor precipitate; and (g) calcining said precipitate.
Claim 8
Dependent Claim
18 words
A process as recited in claims 1, 3 or 4 wherein said organic liquid medium is essentially anhydrous.
Claim 9
Dependent Claim
23 words
A process as recited in claims 1, 3 or 4 wherein reduction of said vanadium is effected by heating the vanadium-containing liquid medium.
Claim 10
Dependent Claim
16 words
A process as recited in claim 4 wherein said unsolubilized vanadium-containing compounds are removed by filtration.
Claim 11
Dependent Claim
18 words
A process as recited in claims 1, 3 or 4 wherein said organic liquid is an olefinic alcohol.
Claim 12
Dependent Claim
23 words
A process as recited in claim 8 wherein said organic liquid is selected from allyl alcohol, methallyl alcohol, crotyl alcohol and mixtures thereof.
Claim 13
Dependent Claim
17 words
A process as recited in claims 1, 3 or 4 wherein said vanadium-containing compound is vanadium pentoxide.
Claim 14
Dependent Claim
18 words
A process as recited in claims 1, 3 or 4 wherein said phosphorus-containing compound is a phosphoric acid.
Claim 15
Dependent Claim
44 words
A process as recited in claims 1, 3 or 4 wherein said oxidation catalyst is represented by the empirical formula: V.sub.1 P.sub.a O.sub.x wherein a=0.5 to 2.0 and x is the number of oxygens required to satisfy the valence requirements of the other elements.
Claim 16
Dependent Claim
28 words
A process as recited in claims 1, 3 or 4 wherein said oxidation catalyst is represented by the empirical formula V 1 P 1 .2 O x .
Claim 17
Dependent Claim
89 words
An oxidation catalyst containing the mixed oxides of vanadium and phosphorus prepared by (a) introducing a pentavalent vanadium-containing compound into an olefinic, oxygenated organic liquid-containing liquid medium, (b) effecting reduction of at least a portion of said vanadium to a valence state of about +4 in the absence of a corrosive reducing agent; (c) adding a phosphorus-containing compound to said medium prior to or subsequent to effecting said reduction to form a catalyst precursor; (d) recovering the catalyst precursor; (e) drying the catalyst precursor; (f) calcining the catalyst precursor.
Claim 18
Dependent Claim
89 words
An oxidation catalyst containing the mixed oxides of vanadium and phosphorus prepared by (a) introducing a pentavalent vanadium-containing compound into an olefinic, oxygenated organic liquid-containing liquid medium, (b) effecting reduction of at least a portion of said vanadium to a valence state of about +4 in the absence of a corrosive reducing agent; (c) adding a phosphorus-containing compound to said medium prior to or subsequent to effecting said reduction to form a catalyst precursor; (d) recovering the catalyst precursor; (e) drying the catalyst precursor; (f) calcining the catalyst precursor.
References Cited (Backward Citations)
US3156707A
Cited
US4035417A
Cited
US3959182A
Cited
US3915892A
Cited
US4017521A
Cited
US3864280A
Cited
US4187235A
Cited
US3987063A
Cited
US4002650A
Cited
US3932305A
Cited
US3931046A
Cited
US3975300A
Cited
US4132670A
Cited
US4043943A
Cited
US4062873A
Cited
US4064070A
Cited
US4016105A
Cited
US4149992A
Cited
US4116868A
Cited
US4147661A
Cited
US4179404A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |