Patent US4247419A successfully refreshed from Google Patents.
US4247419A
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Single phase vanadium(IV)bis(metaphosphate) oxidation catalyst with improved intrinsic surface area
Assignee: Lyondell Chemical Technology LP
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Filing: 1979-12-13
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Granted: 1981-01-27
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Expires: 1999-12-13
Abstract
Abstract A method for the preparation of a single phase crystalline vanadium(IV)bis(metaphosphate), VO(PO3)2, catalyst having an improved intrinsic surface area of from about 5 to 15 m2/g. and useful for the vapor phase oxidation of linear C4 unsaturated olefins, such as n-butenes, to prepare maleic anhydride.
Inventors
- 👤 James C. Vartuli
- 👤 Lee R. Zehner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:13
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252; B; B01; B01J; B01J23/00; B01J23/002; B01J27/00; B01J27/14; B01J27/186; B01J27/195; B01J27/198; B01J29/00; B01J29/04; B01J29/06; B01J29/076; B01J2523/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
141 words
A method for the preparation of a single phase crystalline vanadium(IV)bis(metaphosphate) oxidation catalyst for preparing maleic anhydride by oxidation of unsaturated aliphatic hydrocarbons, which catalyst has an intrinsic surface area of from about 5.0 to 15.0 m 2 /g., which comprises the steps of: forming a slurry of vanadyl sulfate, acetic anhydride and phosphorus pentoxide with the liberation of exothermic heat; introducing said slurry into a heating zone and maintaining said zone at a temperature of at least about 325° C. for a period sufficient for the liberation of gases and forming a vanadium phosphorus reaction product; cooling the reaction product and washing with water to essentially remove any soluble residue; drying the washed product and calcining in air to obtain a single phase crystalline vanadium(IV)bis(metaphosphate) catalyst having an intrinsic surface area of from about 5.0 to 15.0 m 2 /g.
Claim 2
Independent Claim
141 words
A method for the preparation of a single phase crystalline vanadium(IV)bis(metaphosphate) oxidation catalyst for preparing maleic anhydride by oxidation of unsaturated aliphatic hydrocarbons, which catalyst has an intrinsic surface area of from about 5.0 to 15.0 m 2 /g., which comprises the steps of: forming a slurry of vanadyl sulfate, acetic anhydride and phosphorus pentoxide with the liberation of exothermic heat; introducing said slurry into a heating zone and maintaining said zone at a temperature of at least about 325° C. for a period sufficient for the liberation of gases and forming a vanadium phosphorus reaction product; cooling the reaction product and washing with water to essentially remove any soluble residue; drying the washed product and calcining in air to obtain a single phase crystalline vanadium(IV)bis(metaphosphate) catalyst having an intrinsic surface area of from about 5.0 to 15.0 m 2 /g.
Claim 3
Dependent Claim
14 words
A method according to claim 1 wherein the slurry is formed at ambient temperatures.
Claim 4
Dependent Claim
23 words
A method according to claim 1 wherein at least stoichiometric amounts of vanadyl sulfate and phosphorus pentoxide are employed to form the slurry.
Claim 5
Dependent Claim
35 words
A method according to claim 1 wherein the amount of acetic anhydride employed is in the range of from about 1 to 4 mole per mole of the combined vanadyl sulfate and phosphorus pentoxide present.
Claim 6
Dependent Claim
21 words
A method according to claim 1 wherein excess liquid is decanted from said slurry prior to introduction into the heating zone.
Claim 7
Dependent Claim
30 words
A method according to claim 1 wherein the slurry of vanadyl sulfate, phosphorus pentoxide and acetic anhydride is reacted at a temperature of between about 400° C. and 460° C.
Claim 8
Dependent Claim
31 words
A method according to claim 1 wherein the reaction product is dried at a temperature of about 120° C. and calcined in air at a temperature of at least 450° C.
Claim 9
Dependent Claim
25 words
A method according to claim 1 wherein the single phase crystalline vanadium(IV)bis(metaphosphate) catalyst is prepared in the presence of a suitable carrier or support material.
Claim 10
Dependent Claim
20 words
A method according to claim 4 wherein the amount of acetic anhydride employed is between about 2 to 3 moles.
Claim 11
Dependent Claim
23 words
A method according to claim 8 wherein the carrier or support material is added to the vanadyl sulfate, acetic anhydride, phosphorus pentoxide slurry.
Claim 12
Dependent Claim
14 words
A method according to claim 10 wherein the carrier or support is an aluminosilicate.
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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) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |