US4128591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkyl aromatic isomerization
Assignee: Engelhard Minerals and Chemicals Corp
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Filing: 1977-05-31
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Granted: 1978-12-05
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Expires: 1997-05-31
Abstract
Abstract Disclosure is made of an improved catalyst and process for producing a near equilibrium mixture of xylenes from a feedstream comprising ethylbenzene and mixed xylenes. The catalyst combines a platinum-containing hydrogenation-dehydrogenation component on an alumina support with a form of hydrogen mordenite having less than about 0.3 equivalents of alkali and alkaline earth metal cations per gram-atom of aluminum and a silica to alumina mol ratio greater than about 9-11 to 1 and less than about 17 to 1.
Inventors
- 👤 William C. Carr
- 👤 Leon M. Polinski
- 👤 Saul G. Hindin
- 👤 James L. Kosco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:13
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/18; B01J29/20; B01J29/22; B01J23/00; B01J23/38; B01J23/40; C; C07; C07C; C07C5/00; C07C5/22; C07C5/27; C07C5/2702; C07C5/2724
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
147 words
A process for isomerizing C 8 alkyl aromatic compounds including ethylbenzene in amounts greater than the equilibrium amount comprising passing said alkyl aromatic compounds and hydrogen under isomerizing conditions over a catalyst and producing a near equilibrium amount of mixed xylenes and ethylbenzene, said catalyst consisting essentially of: (a) a catalytically active amount of a component selected from the group consisting of platinum and platinum plus one or more of palladium, ruthenium, rhodium, iridium, and rhenium, deposited on particulate alumina; and (b) particulate hydrogen mordenite containing less than 0.1 gram equivalent of alkali and alkaline earth metal cations per gram atom of aluminum and having a silica to alumina ratio greater than about 9-11 to 1 and less than about 17 to 1, said component on particulate alumina of (a) and said particulate hydrogen mordenite of (b) being prepared separately and thereafter combined to produce said catalyst.
Claim 2
Dependent Claim
147 words
A process for isomerizing C 8 alkyl aromatic compounds including ethylbenzene in amounts greater than the equilibrium amount comprising passing said alkyl aromatic compounds and hydrogen under isomerizing conditions over a catalyst and producing a near equilibrium amount of mixed xylenes and ethylbenzene, said catalyst consisting essentially of: (a) a catalytically active amount of a component selected from the group consisting of platinum and platinum plus one or more of palladium, ruthenium, rhodium, iridium, and rhenium, deposited on particulate alumina; and (b) particulate hydrogen mordenite containing less than 0.1 gram equivalent of alkali and alkaline earth metal cations per gram atom of aluminum and having a silica to alumina ratio greater than about 9-11 to 1 and less than about 17 to 1, said component on particulate alumina of (a) and said particulate hydrogen mordenite of (b) being prepared separately and thereafter combined to produce said catalyst.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein the hydrogen mordenite has a silica to alumina mol ratio of about 14 to 1.
References Cited (Backward Citations)
US3409686A
Cited
US3767721A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-04 | 1982-06-05 | 1982-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-04 | 1986-06-05 | 1986-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-04 | 1990-06-05 | 1990-12-05 | $7700.00 | Window Closed / Lapsed |