Patent US3974233A successfully refreshed from Google Patents.
US3974233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of a rhenium heptoxide/alumina disproportionation catalyst
Assignee: BP Chemicals Ltd
•
Filing: 1974-10-17
•
Granted: 1976-08-10
•
Expires: 1994-10-17
Abstract
Abstract A rhenium heptoxide supported on alumina catalyst is prepared by digesting the alumina support with an aqueous solution of ammonium phosphate, ammonium dihydrogen phosphate or diammonium hydrogen phosphate at a temperature in the range ambient to the boiling point of the solution, separating the treated alumina by for example sieving and loading the treated alumina with between 1 and 15% by weight of rhenium heptoxide. The catalyst prepared in this manner is active for the disproportionation of olefinic hydrocarbons.
Inventors
- 👤 Malcolm John Lawrenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:46
CPC Classifications
C; C07; C07C; C07C6/00; C07C6/02; C07C6/04; B; B01; B01J; B01J23/00; B01J23/16; B01J23/32; B01J23/36; B01J27/00; B01J27/14; B01J27/186; B01J27/187; B01J37/00; B01J37/28; C07C2521/00; C07C2521/02; C07C2521/04; C07C2523/00; C07C2523/16; C07C2523/32; C07C2523/36
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
138 words
A process for the disproportionation of an olefinic hydrocarbon feedstock which process comprises contacting an olefinic hydrocarbon or a mixture thereof selected from C 2 to C 30 acyclic and branched chain olefins at a temperature in the range -20° to +500°C and a pressure in the range 0 to 2000 psig with a rhenium heptoxide supported on alumina disproportionation catalyst prepared by digesting the alumina support with an aqueous solution of an ammonium salt selected from ammonium phosphate, ammonium dihydrogen phosphate and diammonium hydrogen phosphate at a temperature between ambient and the boiling point of the aqueous ammonium salt solution, the amount of phosphate ions in the alumina support being at a maximum of 16% by weight separating the treated alumina thereform and loading the treated alumina with between 1 and 15% by weight of rhenium heptoxide.
Claim 2
Dependent Claim
138 words
A process for the disproportionation of an olefinic hydrocarbon feedstock which process comprises contacting an olefinic hydrocarbon or a mixture thereof selected from C 2 to C 30 acyclic and branched chain olefins at a temperature in the range -20° to +500°C and a pressure in the range 0 to 2000 psig with a rhenium heptoxide supported on alumina disproportionation catalyst prepared by digesting the alumina support with an aqueous solution of an ammonium salt selected from ammonium phosphate, ammonium dihydrogen phosphate and diammonium hydrogen phosphate at a temperature between ambient and the boiling point of the aqueous ammonium salt solution, the amount of phosphate ions in the alumina support being at a maximum of 16% by weight separating the treated alumina thereform and loading the treated alumina with between 1 and 15% by weight of rhenium heptoxide.
Claim 3
Dependent Claim
24 words
A process according to claim 1 wherein the olefinic hydrocarbon or mixture thereof is selected from C 2 to C 8 straight chain alkenes.
Claim 4
Dependent Claim
17 words
A process according to claim 1 wherein the mixture of olefinic hydrocarbons consists of isobutene and butene-2.
Claim 5
Dependent Claim
17 words
A process according to claim 1 wherein the disproportionation temperature is in the range +20° to 100°C.
Claim 6
Dependent Claim
27 words
A process according to claim 1 when effected in the liquid phase at a liquid hourly space velocity of the feedstock in the range 5 to 20.
Claim 7
Dependent Claim
25 words
A process according to claim 1 when effected in the gas phase at a Gas Hourly Space Velocity in the range 2000 to 6000 vol/vol.
Claim 8
Dependent Claim
21 words
A process according to claim 1 wherein the olefin/catalyst weight ratio in a batch process in the range 1000:1 to 1:1.
Claim 9
Dependent Claim
19 words
A process according to claim 1 wherein the reaction time is in the range 0.1 seconds to 10 minutes.
References Cited (Backward Citations)
US2441297A
Cited
US2938874A
Cited
US3423331A
Cited
US3326961A
Cited
US3342750A
Cited
US3485889A
Cited
GB1208038A
Cited
US3707581A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |