US2776328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Durene recovery process
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1952-09-08
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Granted: 1957-01-01
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Expires: 1972-09-08
Abstract
No abstract record available.
Inventors
- 👤 Rufus B Bennett
- 👤 Reuben F Pfennig
- 👤 Raymond A Speed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:39
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/0059; C; C07; C07C; C07C7/00; C07C7/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
230 words
A METHOD FOR RECOVERING A HIGH PURITY DURENE FRACTION FROM A FEED STOCK CONTAINING DURENE IN AN AMOUNT NOT GREATER THAN 15% INCLUDING THE STEPS OF CHILLING SAID FEED STOCK TO A TEMPERATURE IN THE RANGE OF -75*F. TO -110*F. TO FORM A FIRST SLURRY CONTAINING DURENE CRYSTALS, SEPARATING FROM SAID FIRST SLURRY A FIRST LIQUID FRACTION AND A FIRST FILTER CAKE FRACTION INCLUDING SAID DURENE CRYSTAL AND CONTAINING WITHIN THE RANGE OF 15% TO 50% DURENE, MELTING SAID FIRST FILTER CAKE FRACTION, USING IT TO FORM A SECOND FEED STOCK, CHILLING SAID SECOND FEED STOCK TO A TEMPERATURE OF APPRAOXIMATELY 0*F. TO FORM A SECOND SLURRY CONTAINING DURENE CRYSTALS, SEPARTING FROM SAID SECOND SLURRY A SECOND FILTER CAKE FRACTION CONTAINING DURENE CRYSTALS IN AN AMOUNT WITHIN THE RANGE OF 60% TO 90% DURENE AND A SECOND LIQUID FRACTION, MELTING SAID SECOND FILTER CAKE AND USING IT TO FORM A THIRD FEED STOCK CONTAINING DURENE WITHIN THE RANGE OF 60% TO 90%, COOLING SAID THIRD FEED STOCK TO A TEMPERATURE OF APPROXIMATELY 100*F. TO FORM A THIRD SLURRY CONTAINING DURENCE CRYSTALS AND SEPARATING FROM SAID FEED STOCK A THIRD FILTER CAKE AS HIGH PURITY DURENE PRODUCT AND A THIRD LIQUID FRACTION, ADMIXING THE SECOND LIQUID FRACTION WITH THE FEED STOCK, AND ADDING THE THIRD LIQUID FRACTION TO THE FIRST FILTER CAKE FRACTION FOR ADMIXTURE WITH THE MELTED FIRST CAKE FRACTION.
Claim 2
Independent Claim
230 words
A METHOD FOR RECOVERING A HIGH PURITY DURENE FRACTION FROM A FEED STOCK CONTAINING DURENE IN AN AMOUNT NOT GREATER THAN 15% INCLUDING THE STEPS OF CHILLING SAID FEED STOCK TO A TEMPERATURE IN THE RANGE OF -75*F. TO -110*F. TO FORM A FIRST SLURRY CONTAINING DURENE CRYSTALS, SEPARATING FROM SAID FIRST SLURRY A FIRST LIQUID FRACTION AND A FIRST FILTER CAKE FRACTION INCLUDING SAID DURENE CRYSTAL AND CONTAINING WITHIN THE RANGE OF 15% TO 50% DURENE, MELTING SAID FIRST FILTER CAKE FRACTION, USING IT TO FORM A SECOND FEED STOCK, CHILLING SAID SECOND FEED STOCK TO A TEMPERATURE OF APPRAOXIMATELY 0*F. TO FORM A SECOND SLURRY CONTAINING DURENE CRYSTALS, SEPARTING FROM SAID SECOND SLURRY A SECOND FILTER CAKE FRACTION CONTAINING DURENE CRYSTALS IN AN AMOUNT WITHIN THE RANGE OF 60% TO 90% DURENE AND A SECOND LIQUID FRACTION, MELTING SAID SECOND FILTER CAKE AND USING IT TO FORM A THIRD FEED STOCK CONTAINING DURENE WITHIN THE RANGE OF 60% TO 90%, COOLING SAID THIRD FEED STOCK TO A TEMPERATURE OF APPROXIMATELY 100*F. TO FORM A THIRD SLURRY CONTAINING DURENCE CRYSTALS AND SEPARATING FROM SAID FEED STOCK A THIRD FILTER CAKE AS HIGH PURITY DURENE PRODUCT AND A THIRD LIQUID FRACTION, ADMIXING THE SECOND LIQUID FRACTION WITH THE FEED STOCK, AND ADDING THE THIRD LIQUID FRACTION TO THE FIRST FILTER CAKE FRACTION FOR ADMIXTURE WITH THE MELTED FIRST CAKE FRACTION.
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) | 1960-01-01 | 1960-07-02 | 1961-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-01 | 1964-07-02 | 1965-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-01 | 1968-07-02 | 1969-01-01 | $7700.00 | Window Closed / Lapsed |