Patent US2528693A successfully refreshed from Google Patents.
US2528693A
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Production of aromatic hydrocarbons by dehydrogenation of naphthenes
Assignee: Shell Development Co
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Filing: 1947-03-04
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Granted: 1950-11-07
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Expires: 1967-03-04
Abstract
No abstract record available.
Inventors
- 👤 Ava J Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:36
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/02; B01J27/04; C; C07; C07C; C07C5/00; C07C5/42; C07C5/50; C07C5/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
IN A PROCESS FOR THE PRODUCTION OF TOLUENE BY DEHYDREOGENATION OF A NAPHTHENIC STRAIGHT RUN PETROLEUM FRACTION, THE IMPROVEMENT WHICH COMPRISES SEPARATING A FRACTION OF NAPHTHENIC STRAIGHT RUN GASOLINE CONTAINING HYDROAROMATIC NAPTHENES AND NON-HYDROAROMATIC NAPHTHENES AND BOILING PREDOMINANTLY WITHIN 195*F. AND 250*F., ADDING TO SAID STRAIGHT RUN NAPHTHENIC GASOLINE FRACTION AN OLEFINIC CRACKED GASOLINE FRACTION IN SUCH AN AMOUNT THAT THE MOL RATIO OF OLEFINS TO HYDROAROMATIC NAPHTHENE IN THE MIXTURE IS BETWEEN ABOUT 0.5:1 AND 2:1, AND EFFECTING THE DEHYDROGENATION OF SAID MIXTURE SUBSTANTIALLY CONTINUOUSLY WITH A CATALYST CONSISTING ESSENTIALLY OF A MAJOR MOL AMOUNT OF A SULFIDE OF A METAL OF THE IRON GROUP AND A MINOR MOL AMOUNT OF TUNGSTEN SULFIDE IN THE PRESENCE
Claim 2
Dependent Claim
117 words
IN A PROCESS FOR THE PRODUCTION OF TOLUENE BY DEHYDREOGENATION OF A NAPHTHENIC STRAIGHT RUN PETROLEUM FRACTION, THE IMPROVEMENT WHICH COMPRISES SEPARATING A FRACTION OF NAPHTHENIC STRAIGHT RUN GASOLINE CONTAINING HYDROAROMATIC NAPTHENES AND NON-HYDROAROMATIC NAPHTHENES AND BOILING PREDOMINANTLY WITHIN 195*F. AND 250*F., ADDING TO SAID STRAIGHT RUN NAPHTHENIC GASOLINE FRACTION AN OLEFINIC CRACKED GASOLINE FRACTION IN SUCH AN AMOUNT THAT THE MOL RATIO OF OLEFINS TO HYDROAROMATIC NAPHTHENE IN THE MIXTURE IS BETWEEN ABOUT 0.5:1 AND 2:1, AND EFFECTING THE DEHYDROGENATION OF SAID MIXTURE SUBSTANTIALLY CONTINUOUSLY WITH A CATALYST CONSISTING ESSENTIALLY OF A MAJOR MOL AMOUNT OF A SULFIDE OF A METAL OF THE IRON GROUP AND A MINOR MOL AMOUNT OF TUNGSTEN SULFIDE IN THE PRESENCE
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-06 | 1954-05-08 | 1954-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-06 | 1958-05-08 | 1958-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-06 | 1962-05-08 | 1962-11-07 | $7700.00 | Window Closed / Lapsed |