Patent US4368345A successfully refreshed from Google Patents.
US4368345A
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Catalyst for disproportionation of olefins
Assignee: BP Chemicals Ltd
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Filing: 1981-12-22
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Granted: 1983-01-11
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Expires: 2001-12-22
Abstract
Abstract The present invention relates to a process for the disproportionation of n-olefins comprising contacting the olefin feed with a catalyst composition comprising molybdenum oxide or tungsten oxide supported on silica. The catalyst composition is produced by impregnating a silica support with an alcoholic solution of a halide of a metal selected from molybdenum and tungsten, removing the alcoholic solvent by evaporation, and heat treating the impregnated support at an elevated temperature such that (a) the metal halide is converted to the corresponding oxide and/or an oxy-salt and (b) the halogen content thereof is reduced to less than 0.1% by weight of the total composition. By using a catalyst produced by this method, it is possible to carry out the process so as to selectively produce linear higher olefins.
Inventors
- 👤 Kathleen F. Dickinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:20
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; C; C07; C07C; C07C6/00; C07C6/02; C07C6/04; C07C2521/00; C07C2521/06; C07C2521/08; C07C2523/00; C07C2523/16; C07C2523/24; C07C2523/28; C07C2523/30
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
100 words
A process for the disproportionation of n-olefins comprising contacting the olefin feed with a catalyst composition comprising molybdenum oxide or tungsten oxide supported on silica characterised in that the catalyst composition is produced by impregnating a silica support with a solution made from a halide of a metal selected from molybdenum and tungsten, removing the solvent by evaporation, and heat treating the impregnated support at an elevated temperature such that (a) the metal is converted to the corresponding oxide and/or an oxy-salt and (b) the halogen content thereof is reduced to less than 0.1% by weight of the total composition.
Claim 2
Dependent Claim
100 words
A process for the disproportionation of n-olefins comprising contacting the olefin feed with a catalyst composition comprising molybdenum oxide or tungsten oxide supported on silica characterised in that the catalyst composition is produced by impregnating a silica support with a solution made from a halide of a metal selected from molybdenum and tungsten, removing the solvent by evaporation, and heat treating the impregnated support at an elevated temperature such that (a) the metal is converted to the corresponding oxide and/or an oxy-salt and (b) the halogen content thereof is reduced to less than 0.1% by weight of the total composition.
Claim 3
Dependent Claim
30 words
A process according to claim 1 wherein the metal halide used as the source of tungsten is a hexa-halide of tungsten and the source of molybdenum is a molybdenum penta-halide.
Claim 4
Dependent Claim
26 words
A process according to claim 1 or 2 wherein the impregnation solution is prepared by mixing the metal halide with a solvent of relatively low volatility.
Claim 5
Dependent Claim
14 words
A process according to claim 3 wherein the solvent is water or an alcohol.
Claim 6
Dependent Claim
28 words
A process according to claim 1 wherein the silica used as support in the catalyst composition is selected from precipitated silica gel, microspheroidal silica or flame hydrolysed silica.
Claim 7
Dependent Claim
21 words
A process according to claim 1 wherein the silica support has a surface area of at least 50 m 2 /g.
Claim 8
Dependent Claim
23 words
A process according to claim 1 wherein the heat-treatment of the impregnated silica support is carried out at a temperature above 450° C.
Claim 9
Dependent Claim
20 words
A process according to claim 7 wherein the heat-treatment is effected in an atmosphere containing air, oxygen or oxygenated gases.
Claim 10
Dependent Claim
21 words
A process according to claim 1 wherein the catalyst compositions used contain between 0.5 and 40% by weight of the metal.
Claim 11
Dependent Claim
49 words
A process according to claim 1 wherein the n-olefin feed which is disproportionated comprises a hydrocarbon containing between 2 and 30 carbon atoms per molecule and the n-olefin feed is passed over the solid catalyst composition maintained at a temperature above 300° C. and at pressures above 200 psig.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-10 | 1986-07-12 | 1987-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-10 | 1990-07-12 | 1991-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-10 | 1994-07-12 | 1995-01-11 | $7700.00 | Window Closed / Lapsed |