US4315864A
Expired / Lapsed
US
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Preparation of maleic anhydride
Assignee: Standard Oil Co
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Filing: 1980-10-22
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Granted: 1982-02-16
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Expires: 2000-10-22
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
2026-11-07 18:15
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/16; B01J27/18; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252; B01J23/00; B01J23/002; B01J23/16; B01J23/20; B01J23/22; B01J27/186; B01J27/195; B01J27/198; C07C51/215; C07C57/00; C07C57/02; C07C57/13; C07C57/145; B01J2523/00; Y; Y10; Y10S; Y10S502/00; Y10S502/506; Y10S502/512; Y10S502/513
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
134 words
A process for the production of maleic anhydride by the oxidation of n-butane, n-butene, 1,3-butadiene or a mixture thereof with molecular oxygen or oxygen-containing gas in the vapor phase at a reaction temperature of 250° C.-600° C. in the presence of a catalyst containing the mixed oxides of vanadium and phosphorus, wherein said catalyst is 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 and 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
134 words
A process for the production of maleic anhydride by the oxidation of n-butane, n-butene, 1,3-butadiene or a mixture thereof with molecular oxygen or oxygen-containing gas in the vapor phase at a reaction temperature of 250° C.-600° C. in the presence of a catalyst containing the mixed oxides of vanadium and phosphorus, wherein said catalyst is 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 and 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
149 words
A process for the production of maleic anhydride by the oxidation of n-butane, n-butene, 1,3 butadiene or a mixture thereof with molecular oxygen or oxygen-containing gas in the vapor phase at a reaction temperature of 250° C.-600° C. in the presence of a catalyst containing the mixed oxides of vanadium and phosphorus, wherein said catalyst is prepared by (a) introducing a pentavalent vanadium-compound into an olefinic 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; (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 resultng from step (c) to form a catatalyst precursor precipitate; (e) recovering said catalyst precursor precipitate; (f) drying said catalyst precursor precipitate; and (g) calcining said precipitate.
Claim 5
Dependent Claim
149 words
A process for the production of maleic anhydride by the oxidation of n-butane, n-butene, 1,3 butadiene or a mixture thereof with molecular oxygen or oxygen-containing gas in the vapor phase at a reaction temperature of 250° C.-600° C. in the presence of a catalyst containing the mixed oxides of vanadium and phosphorus, wherein said catalyst is prepared by (a) introducing a pentavalent vanadium-compound into an olefinic 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; (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 resultng from step (c) to form a catatalyst precursor precipitate; (e) recovering said catalyst precursor precipitate; (f) drying said catalyst precursor precipitate; and (g) calcining said precipitate.
Claim 6
Dependent Claim
17 words
A process as recited in claim 1 or 2 wherein said organic liquid medium is essentially anhydrous.
Claim 7
Dependent Claim
22 words
A process as recited in claim 1 or 2 wherein reduction of said vanadium is effected by heating the vanadium-containing liquid medium.
Claim 8
Dependent Claim
16 words
A process as recited in claim 3 wherein said unsolubilized vanadium-containing compounds are removed by filtration.
Claim 9
Dependent Claim
17 words
A process as recited in claim 1 or 2 wherein said organic liquid is an olefinic alcohol.
Claim 10
Dependent Claim
23 words
A process as recited in claim 7 wherein said organic liquid is selected from allyl alcohol, methallyl alcohol, crotyl alcohol and mixtures thereof.
Claim 11
Dependent Claim
43 words
A process as recited in claim 1 or 2 wherein said oxidation catalyst is represented by the empirical formula: V.sub.l 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 12
Dependent Claim
27 words
A process as recited in claim 1 or 2 wherein said oxidation catalyst is represented by the empirical formula V 1 P 1 .1 o x .
Claim 13
Dependent Claim
124 words
A process for the production of maleic anhydride by the oxidation of n-butane, n-butene, 1,3 butadiene or a mixture thereof with molecular oxygen or oxygen-containing gas in the vapor phase at a reaction temperature of 250° C.-600° C. in the presence of a catalyst containing the mixed oxides of vanadium and phosphorus, prepared 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 +3.9 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 and in the absence of a corrosive reducing agent.
Claim 14
Dependent Claim
124 words
A process for the production of maleic anhydride by the oxidation of n-butane, n-butene, 1,3 butadiene or a mixture thereof with molecular oxygen or oxygen-containing gas in the vapor phase at a reaction temperature of 250° C.-600° C. in the presence of a catalyst containing the mixed oxides of vanadium and phosphorus, prepared 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 +3.9 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 and in the absence of a corrosive reducing agent.
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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) | 1985-02-15 | 1985-08-17 | 1986-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-15 | 1989-08-17 | 1990-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-15 | 1993-08-17 | 1994-02-16 | $7700.00 | Window Closed / Lapsed |