US4276197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of a titanium promoted VO(PO3)2 oxidation catalyst
Assignee: Lyondell Chemical Technology LP
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Filing: 1979-12-19
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Granted: 1981-06-30
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Expires: 1999-12-19
Abstract
Abstract A method for the preparation of a titanium promoted single phase vanadium(IV)bis(metaphosphate) catalyst useful for the vapor phase oxidation of a linear C 4 unsaturated olefins 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 07:34
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; B01J2523/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
108 words
A method for the preparation of a titanium promoted single phase crystalline vanadium(IV)bis(metaphosphate) hydrocarbon oxidation catalyst which comprises the steps of: forming a slurry of vanadyl sulfate, titanium dioxide, 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 titanium-vanadium-phosphorus reaction product; cooling the reaction product and washing with water to essentially remove any soluble residue; drying the water washed product and calcining in air to obtain a titanium containing single phase crystalline vanadium(IV)bis(metaphosphate) catalyst.
Claim 2
Independent Claim
108 words
A method for the preparation of a titanium promoted single phase crystalline vanadium(IV)bis(metaphosphate) hydrocarbon oxidation catalyst which comprises the steps of: forming a slurry of vanadyl sulfate, titanium dioxide, 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 titanium-vanadium-phosphorus reaction product; cooling the reaction product and washing with water to essentially remove any soluble residue; drying the water washed product and calcining in air to obtain a titanium containing single phase crystalline vanadium(IV)bis(metaphosphate) catalyst.
Claim 3
Dependent Claim
34 words
A method according to claim 1 wherein the molar ratio of titanium to vanadium, employed in the form of titanium dioxide and vanadyl sulfate, is in the range of from about 1:10 to 1:150.
Claim 4
Dependent Claim
11 words
A method according to claim 2 wherein the ratio is 1:80.
Claim 5
Dependent Claim
19 words
A method according to claim 1 wherein the vanadyl sulfate-titanium dioxide-acetic anhydride-phosphorus pentoxide slurry is formed at ambient temperature.
Claim 6
Dependent Claim
23 words
A method according to claim 1 wherein at least stoichiometric quantities of vanadyl sulfate and phosphorus pentoxide are employed to form the slurry.
Claim 7
Dependent Claim
37 words
A method according to claim 1 wherein the amount of acetic anhydride employed is in the range of from about 1 to 4 moles per mole of the combined vanadyl sulfate, titanium dioxide and phosphorus pentoxide employed.
Claim 8
Dependent Claim
20 words
A method according to claim 1 wherein the amount of acetic anhydride employed is from about 2 to 3 moles.
Claim 9
Dependent Claim
21 words
A method according to claim 1 wherein excess liquid is decanted from the slurry prior to introduction into the heating zone.
Claim 10
Dependent Claim
22 words
A method according to claim 1 wherein the slurry is reacted at a temperature of between about 400° C. and 460° C.
Claim 11
Dependent Claim
31 words
A method according to claim 1 wherein the titanium-vanadium-phosphorus reaction product is dried at a temperature of 120° C. and calcined in air at a temperature of at least 450° C.
Claim 12
Dependent Claim
26 words
A method according to claim 1 wherein the titanium promoted single phase crystalline vanadium(IV)bis(metaphosphate) catalyst is prepared in the presence of a suitable carrier or support.
Claim 13
Dependent Claim
25 words
A method according to claim 11 wherein the carrier or support material is added to the titanium dioxide vanadyl sulfate, acetic anhydride, phosphorus pentoxide slurry.
Claim 14
Dependent Claim
14 words
A method according to claim 12 wherein the carrier or support is an aluminosilicate.
References Cited (Backward Citations)
FR1470581A
Cited
US3538122A
Cited
US3478063A
Cited
US3985775A
Cited
US4177161A
Cited
US4077984A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-29 | 1984-12-29 | 1985-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-29 | 1988-12-29 | 1989-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-29 | 1992-12-29 | 1993-06-30 | $7700.00 | Window Closed / Lapsed |