US3919339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogenolysis/isomerization process
Assignee: Chevron USA Inc
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Filing: 1974-03-18
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Granted: 1975-11-11
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Expires: 1994-03-18
Abstract
Abstract A process for selective hydrodealkylation of ethylbenzene in a hydrocarbon feedstock comprising ethylbenzene and xylenes, and for simultaneous isomerization of the xylenes, which comprises contacting the feedstock with a catalyst comprising a cobalt or nickel component on an acidic inorganic refractory oxide support at a temperature between 650*-950*F., a pressure below 300 psig, and a hydrogen-to-hydrocarbon feed ratio between 1:1 and 20:1. Preferably the catalyst used is cobalt on silica-alumina.
Inventors
- 👤 Derek L Ransley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:31
CPC Classifications
C; C07; C07C; C07C4/00; C07C4/08; C07C4/12; C07C4/14; C07C4/18; C07C5/00; C07C5/22; C07C5/27; C07C5/2702; C07C5/2705; C07C2521/00; C07C2521/12; C07C2523/00; C07C2523/70; C07C2523/74; C07C2523/75
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
69 words
A PROCESS FOR SELECTIVE HYDRODEALKYLATION OF ETHYLBENZENE IN A HYDROCARBON FEEDSTOCK COMPRISING ETHYLBENZENE AND XYLENES, TO THEREBY CONVERT ETHYLBENZENE TO TOLUENE AND BENZENE, AND FOR SIMULTANEOUS ISOMERIZATION OF THE EXYLENES, WHICH COMPRISES CONTACTING THE FEEDSTOCK WITH A CATALYST CONSISTING ESSENTIALLY OF A COBALT COMPONENT ON A SILICA-ALUMINA SUPPORT AT A TEMPERATURE BETWEEN 650* AND 950*F, A PRESSURE BELOW 300 PSIG AND A HYDROGEN-TO-HYDROCARBON FEED RATIO BETWEEN 1:1 AND 20:1.
Claim 2
Dependent Claim
69 words
A PROCESS FOR SELECTIVE HYDRODEALKYLATION OF ETHYLBENZENE IN A HYDROCARBON FEEDSTOCK COMPRISING ETHYLBENZENE AND XYLENES, TO THEREBY CONVERT ETHYLBENZENE TO TOLUENE AND BENZENE, AND FOR SIMULTANEOUS ISOMERIZATION OF THE EXYLENES, WHICH COMPRISES CONTACTING THE FEEDSTOCK WITH A CATALYST CONSISTING ESSENTIALLY OF A COBALT COMPONENT ON A SILICA-ALUMINA SUPPORT AT A TEMPERATURE BETWEEN 650* AND 950*F, A PRESSURE BELOW 300 PSIG AND A HYDROGEN-TO-HYDROCARBON FEED RATIO BETWEEN 1:1 AND 20:1.
Claim 3
Dependent Claim
23 words
A process in accordance with claim 1 wherein the temperature is between 700*-900*F. and the pressure is between 10 psig and 200 psig.
Claim 4
Dependent Claim
22 words
A process in accordance with claim 1 wherein the temperature is between 750*-900*F. and the pressure between 10 psig and 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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |