Patent US2926206A successfully refreshed from Google Patents.
US2926206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of c-8 aromatic hydrocarbon isomers utilizing werner complexes
Assignee: Union Oil Company of California
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Filing: 1958-02-24
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Granted: 1960-02-23
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Expires: 1978-02-24
Abstract
No abstract record available.
Inventors
- 👤 William D Schaeffer
- 👤 Dorsey William Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:26
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/152
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
A TWO-STAGE PROCESS FOR RECOVERING SUBSTANTIALLY PURE P-XYLENE IN AT LEAST ABOUT 75% YIELD FROM A FEED MIXTURE MADE UP ESSENTIALLY OF C-8 AROMATIC HYDROCARBONS INCLUDING ABOUT 10 TO 30% P-XYLENE, 3K TO 65% M-XYLENE, 0 TO 30% O-XYLENE, AND 5 TO 30% ETHYLBENZENE, WHICH COMPRISES CONTACTING SAID MIXTURE WITH A SOLID WERNER COMPLEX, THE TEMPERATURE OF SAID CONTACTING AND THE AMOUNT OF WERNER COMPLEX EMPLOYED BEING ADJUSTED SO AS TO FORM A SOLID CLATHRATE CONTAINING ABOUT 80-90% OF THE P-XYLENE IN SAID FEED MIXTURE, AND WHEREIN THE CLATHRATED HYDROCARBON PHASE IS PREDOMINANTLY P-XYLENE AND ETHYLBENZENE, AND CONTAINS (1) AT LEAST AS MUCH ETHYLBENZENE AS M-XYLENE, AND (2) SUBSTANTIALLY MORE ETHYLBENZENE THAN O-XYLENE, THEN RECOVERING SAID CLATHRATED HYDROCARBON PHASE AND SUBJECTING IT TO A SINGLE-STAGE FRACTIONAL CRYSTALLIZATION AT A MINIMUM TEMPERATURE WHICH IS (1) BETWEEN ABOUT - 40* AND -90*C. AND (2) ADJUSTED SO AS TO CRYSTALLIZE OUT AT LEAST ABOUT
Claim 2
Dependent Claim
151 words
A TWO-STAGE PROCESS FOR RECOVERING SUBSTANTIALLY PURE P-XYLENE IN AT LEAST ABOUT 75% YIELD FROM A FEED MIXTURE MADE UP ESSENTIALLY OF C-8 AROMATIC HYDROCARBONS INCLUDING ABOUT 10 TO 30% P-XYLENE, 3K TO 65% M-XYLENE, 0 TO 30% O-XYLENE, AND 5 TO 30% ETHYLBENZENE, WHICH COMPRISES CONTACTING SAID MIXTURE WITH A SOLID WERNER COMPLEX, THE TEMPERATURE OF SAID CONTACTING AND THE AMOUNT OF WERNER COMPLEX EMPLOYED BEING ADJUSTED SO AS TO FORM A SOLID CLATHRATE CONTAINING ABOUT 80-90% OF THE P-XYLENE IN SAID FEED MIXTURE, AND WHEREIN THE CLATHRATED HYDROCARBON PHASE IS PREDOMINANTLY P-XYLENE AND ETHYLBENZENE, AND CONTAINS (1) AT LEAST AS MUCH ETHYLBENZENE AS M-XYLENE, AND (2) SUBSTANTIALLY MORE ETHYLBENZENE THAN O-XYLENE, THEN RECOVERING SAID CLATHRATED HYDROCARBON PHASE AND SUBJECTING IT TO A SINGLE-STAGE FRACTIONAL CRYSTALLIZATION AT A MINIMUM TEMPERATURE WHICH IS (1) BETWEEN ABOUT - 40* AND -90*C. AND (2) ADJUSTED SO AS TO CRYSTALLIZE OUT AT LEAST ABOUT
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) | 1963-02-22 | 1963-08-24 | 1964-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-22 | 1967-08-24 | 1968-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-22 | 1971-08-24 | 1972-02-23 | $7700.00 | Window Closed / Lapsed |