Patent US3103541A successfully refreshed from Google Patents.
US3103541A
Expired / Lapsed
US
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Recovery of durene using heated slurry recycle
Assignee: Sinclair Research Inc
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Filing: 1959-11-12
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Granted: 1963-09-10
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Expires: 1979-11-12
Abstract
No abstract record available.
Inventors
- 👤 Reading B Smith
- 👤 Dresser Thorpe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:39
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/0036; B01D9/0059; C; C07; C07C; C07C7/00; C07C7/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
IN A CONTINUOUS METHOD FOR SEPARATING DURENE FROM ITS MIXTURE WITH AROMATIC HYDROCARBONS INCLUDING DURENE ISOMERS, THE MIXTURE BOILING PRIMARILY IN THE RANGE OF ABOUT 350*F. TO 450*F., WHICH METHOD COMPRISES COOLING THE DURENE-CONTAINING MIXTURE TO CRYSTALLINE DURENE, WITHDRAWING RESULTING SLURRY FROM A STAGE OF CRYSTALLIZATION IMMEDIATELY PRIOR TO SEPARATING DURENE TO PROVIDE A MINOR PORTION OF WITHDRAW SLURRY AS A PROCESS STREAM AND A MAJOR PORTION OF THE WITHDRAW SLURRY AS A RECYCLE STREAM, WARMING SAID RECYCLE STREAM TO ABOUT 5 TO 25*F. ABOVE ITS CRYSTALLIZATION ZONE OF CRYSTALLIZARECYCLING SAID WARMED STREAM TO ITS ZONE OF CRYSTALLIZATION AND SEPARATING DURENE CRYSTALS FROM SAID PROCESS STREAM.
Claim 2
Dependent Claim
106 words
IN A CONTINUOUS METHOD FOR SEPARATING DURENE FROM ITS MIXTURE WITH AROMATIC HYDROCARBONS INCLUDING DURENE ISOMERS, THE MIXTURE BOILING PRIMARILY IN THE RANGE OF ABOUT 350*F. TO 450*F., WHICH METHOD COMPRISES COOLING THE DURENE-CONTAINING MIXTURE TO CRYSTALLINE DURENE, WITHDRAWING RESULTING SLURRY FROM A STAGE OF CRYSTALLIZATION IMMEDIATELY PRIOR TO SEPARATING DURENE TO PROVIDE A MINOR PORTION OF WITHDRAW SLURRY AS A PROCESS STREAM AND A MAJOR PORTION OF THE WITHDRAW SLURRY AS A RECYCLE STREAM, WARMING SAID RECYCLE STREAM TO ABOUT 5 TO 25*F. ABOVE ITS CRYSTALLIZATION ZONE OF CRYSTALLIZARECYCLING SAID WARMED STREAM TO ITS ZONE OF CRYSTALLIZATION AND SEPARATING DURENE CRYSTALS FROM SAID PROCESS STREAM.
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) | 1966-09-09 | 1967-03-11 | 1967-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-09 | 1971-03-11 | 1971-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-09 | 1975-03-11 | 1975-09-10 | $7700.00 | Window Closed / Lapsed |