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US4036902A
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Chemical process producing aromatic hydrocarbons by dehydrocyclodimerization of a C4 feedstock
Assignee: BP PLC
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Filing: 1976-06-16
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Granted: 1977-07-19
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Expires: 1996-06-16
Abstract
Abstract This invention relates to a process for producing aromatic hydrocarbons, particularly xylenes, by dehydrocyclodimerization of a C 4 feedstock in the presence of a catalyst comprising alumina promoted by zinc or a zinc compound.
Inventors
- 👤 Reginald Gregory
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:54
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/76; C07C2521/00; C07C2521/02; C07C2521/04; C07C2523/00; C07C2523/06; C07C2527/00; C07C2527/02; C07C2527/053; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
39 words
A process for producing aromatic hydrocarbons comprising subjecting a C feedstock to dehydrocyclodimerisation at a temperature between about 450° to 700° C. in the presence of a catalyst comprising an alumina promoted by zinc or a compound of zinc.
Claim 2
Dependent Claim
39 words
A process for producing aromatic hydrocarbons comprising subjecting a C feedstock to dehydrocyclodimerisation at a temperature between about 450° to 700° C. in the presence of a catalyst comprising an alumina promoted by zinc or a compound of zinc.
Claim 3
Dependent Claim
17 words
A process according to claim 1 wherein the compound of zinc is zinc oxide or zinc sulphate.
Claim 4
Dependent Claim
26 words
A process according to claim 1 wherein the amount of zinc present in the catalyst composition is between 0.1 and 10% by weight of the alumina.
Claim 5
Dependent Claim
26 words
A process according to claim 3 wherein the amount of zinc present in the catalyst composition is between 2.5 and 7.0% by weight of the alumina.
Claim 6
Dependent Claim
16 words
A process according to claim 1 wherein the alumina is selected from eta-alumina, gamma-alumina and boehmite.
Claim 7
Dependent Claim
25 words
A process according to claim 1 wherein the C 4 feedstock is passed over the catalyst composition at a temperature between 500° and 600° C.
Claim 8
Dependent Claim
27 words
A process according to claim 1 wherein the dehydrocyclo- dimerisation of C 4 feedstock is carried out in an atmosphere which is inert under the reaction conditions.
Claim 9
Dependent Claim
17 words
A process according to claim 7 wherein the dehydrocyclodimerisation is carried out in an atmosphere of nitrogen.
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) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |