US4157356A
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Process for aromatizing C3 -C8 hydrocarbon feedstocks using a gallium containing catalyst supported on certain silicas
Assignee: BP PLC
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Filing: 1977-12-02
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Granted: 1979-06-05
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Expires: 1997-12-02
Abstract
Abstract This case relates to a process for producing aromatic hydrocarbons by contacting a C 3 -C 8 hydrocarbon with a gallium catalyst on a silica support which has a surface area greater than 500 m 2 /g and a pore volume less than 0.8 ml/g.
Inventors
- 👤 Stanley N. Bulford
- 👤 Evan E. Davies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:25
CPC Classifications
C; C07; C07C; C07C2/00; B; B01; B01J; B01J23/00; B01J23/08; C07C2/76; C07C2521/00; C07C2521/06; C07C2521/08; C07C2523/00; C07C2523/08
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
53 words
A process for producing aromatic hydrocarbons comprising contacting at an elevated temperature a C 3 -C 8 hydrocarbon feedstock with a catalyst composition consisting essentially of gallium on a silica support wherein the silica has a surface area greater than 500 m 2 /g and a pore volume of less than 0.8 ml/g.
Claim 2
Dependent Claim
53 words
A process for producing aromatic hydrocarbons comprising contacting at an elevated temperature a C 3 -C 8 hydrocarbon feedstock with a catalyst composition consisting essentially of gallium on a silica support wherein the silica has a surface area greater than 500 m 2 /g and a pore volume of less than 0.8 ml/g.
Claim 3
Dependent Claim
18 words
A process according to claim 1 wherein the feedstock is a C 4 hydrocarbon containing isobutane and/or isobutene.
Claim 4
Dependent Claim
21 words
A process according to claim 1 wherein the silica support has a surface area between 600 and 800 m 2 /g.
Claim 5
Dependent Claim
33 words
A process according to claim 1 wherein the silica support has a pore volume between 0.5 ml/g and 0.05 ml/g. and a mean pore diameter of the silica support is less than 65A.
Claim 6
Dependent Claim
39 words
A process according to claim 1 wherein the catalyst composition is activated at a temperature between 500° and 600° C. by passing air, hydrogen or a gas inert under the reaction conditions prior to contact with the hydrocarbon feedstock.
Claim 7
Dependent Claim
28 words
A process according to claim 1 wherein gallium is impregnated on the silica support as gallium oxide or as a compound giving rise to gallium oxide during activation.
Claim 8
Dependent Claim
17 words
A process according to claim 1 wherein the silica support has surface hydroxyl groups available for exchange.
Claim 9
Dependent Claim
23 words
A process according to claim 7 wherein the catalyst composition is prepared by exchanging the surface hydroxyl groups of silica with gallium ions.
Claim 10
Dependent Claim
27 words
A process according to claim 1 wherein the catalyst composition contains between 0.1 and 10.0% by weight of gallium based on the total weight of the support.
Claim 11
Dependent Claim
24 words
A process according to claim 1 wherein the hydrocarbon feedstock is contacted with the catalyst composition at a temperature between 450° and 750° C.
Claim 12
Dependent Claim
33 words
A catalyst composition consisting essentially of gallium on a silica support wherein the silica has a surface area greater than 500 m 2 /g and a pore volume of less than 0.8 ml/gram.
Claim 13
Dependent Claim
33 words
A catalyst composition consisting essentially of gallium on a silica support wherein the silica has a surface area greater than 500 m 2 /g and a pore volume of less than 0.8 ml/gram.
Claim 14
Dependent Claim
45 words
A catalyst composition as defined in claim 11 wherein said silica has a surface area of between about 600 to 800 m 2 /g and a pore volume between about 0.5 ml/g and 0.05 ml/g and a mean pore diameter of less than 65 A.
Claim 15
Dependent Claim
30 words
A catalyst composition as defined in claim 11 wherein gallium is impregnated on the silica support as gallium oxide or as a compound giving rise to gallium oxide during activation.
Claim 16
Dependent Claim
24 words
A catalyst composition as defined in claim 11 which additionally contains one or more of the metals palladium, indium, germanium, chromium, tin and zinc.
Claim 17
Dependent Claim
19 words
A catalyst composition as defined in claim 11 wherein said silica support has surface hydroxyl groups available for exchange.
Claim 18
Dependent Claim
26 words
A process as defined in claim 1 wherein said catalyst composition additionally contains one or more of the metals palladium, indium, germanium, chromium, tin, and zinc.
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) | 1982-06-04 | 1982-12-04 | 1983-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-04 | 1986-12-04 | 1987-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-04 | 1990-12-04 | 1991-06-05 | $7700.00 | Window Closed / Lapsed |