US2894048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of mixed xylenes by fractional crystallization of reformed and hydrogenated petroleum fraction
Assignee: Sunoco Inc
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Filing: 1956-04-06
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Granted: 1959-07-07
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Expires: 1976-04-06
Abstract
No abstract record available.
Inventors
- 👤 Jr Frank R Shuman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:40
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/005; C07C7/148; C07C7/163
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
PROCESS FOR SEPARATING P-XYLENE FROM MIXTURES WHICH COMPRISES CONTACTING A MIXTURE COMPRISING P-XYLENE, ISOMERS THEREOF, AND A MINOR AMOUNT OF COMPOUNDS CONTAINING HYDROGENATABLE NONAROMATIC GROUPS WITH HYDROGEN IN THE PRESENCE OF A HYDROGENATION CATALYST UNDER HYDROGENATING CONDITIONS PROVIDING PRIMARILY (1) A DECREASE IN AROMATIC HYDROCARBON CONTENT WITHIN THE APPROXIMATE RANGE FROM 0 TO 10 WEIGHT PERCENT, AND (2) SUBSTANTIAL HYDROGENATION OF NONAROMATIC GROUPS; AND FRACTIONALLY CRYSTALLIZING THE RESULTING HYDROGENATED MIXTURE TO SEPARATE P-XYLENE, THE INITIAL CRYSTALLIZATION TEMPERATURE BEING HIGHER AS A RESULT OF SAID HYDROGENATION THE FIRST-NAMED MIXTURE HAVING PREVIOUSLY BEEN OBTAINED BY CONTACTING A STRAIGHT RUN PETROLEUM FRACTION WITH A REFORMING CATALYST UNDER REFORMING CONDITION.
Claim 2
Dependent Claim
106 words
PROCESS FOR SEPARATING P-XYLENE FROM MIXTURES WHICH COMPRISES CONTACTING A MIXTURE COMPRISING P-XYLENE, ISOMERS THEREOF, AND A MINOR AMOUNT OF COMPOUNDS CONTAINING HYDROGENATABLE NONAROMATIC GROUPS WITH HYDROGEN IN THE PRESENCE OF A HYDROGENATION CATALYST UNDER HYDROGENATING CONDITIONS PROVIDING PRIMARILY (1) A DECREASE IN AROMATIC HYDROCARBON CONTENT WITHIN THE APPROXIMATE RANGE FROM 0 TO 10 WEIGHT PERCENT, AND (2) SUBSTANTIAL HYDROGENATION OF NONAROMATIC GROUPS; AND FRACTIONALLY CRYSTALLIZING THE RESULTING HYDROGENATED MIXTURE TO SEPARATE P-XYLENE, THE INITIAL CRYSTALLIZATION TEMPERATURE BEING HIGHER AS A RESULT OF SAID HYDROGENATION THE FIRST-NAMED MIXTURE HAVING PREVIOUSLY BEEN OBTAINED BY CONTACTING A STRAIGHT RUN PETROLEUM FRACTION WITH A REFORMING CATALYST UNDER REFORMING CONDITION.
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) | 1962-07-06 | 1963-01-05 | 1963-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-06 | 1967-01-05 | 1967-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-06 | 1971-01-05 | 1971-07-07 | $7700.00 | Window Closed / Lapsed |