US2816938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fractional crystallization under pressure
Assignee: Texaco Inc
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Filing: 1954-06-18
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Granted: 1957-12-17
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Expires: 1974-06-18
Abstract
No abstract record available.
Inventors
- 👤 Howard V Hess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:06
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/14; B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013; B01D9/0059
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
A PROCESS OF FRACTIONATING A LIQUID ADMIXTURE WHEREIN SAID LIQUID ADMIXTURE IS SELECTED FROM THE GROUP CONSISTING OF A LIQUID MIXTURE CONTAINING PARA-XYLENE AND META-XYLENE HAVING A COMPOSITION SUCH THAT ONLY PARAXYLENE IS INTIALLY CRYSTALLIZED THEREFROM A LIQUID MIXTURE CONTAINING BENZENE AND HEXANES HAVING A SIMILAR BOILING POINT, SAID BENZENE CONTAINING LIQUID MIXTURE HAVING A COMPOSITION SUCH THAT ONLY BENZENE IS INTIALLY CRYSTALLIZED THEREFROM AND A LIQUID MIXTURE CONTAINING CYCLOHEXANE AND OTHER C6 HYDROCARBONS HAVING A SIMILAR BOILING POINT, SAID CYCLOHEXANE CONTAINING MIXTURE HAVING A COMPOSITION SUCH THAT ONLY CYCLOHEXANE IS INITIALLY CRYSTALLIZED THEREFROM, WHICH COMPRISES SUBJECTING SAID LIQUID ADMIXTURE TO AN ELEVATED PRESSURE IN EXCESS OF 2000 P.S.I.G., ADJUSTING THE TEMPERATURE OF SAID LIQUID ADMIXTURE WHILE SAID ADMIXTURE IS SUBJECTED TO SAID PRESSURE TO CRYSTALLIZED A COMPONENT THEREFROM, AND RECOVERING THE RESULTING CRYSTALLIZED COMPONENT.
Claim 2
Dependent Claim
135 words
A PROCESS OF FRACTIONATING A LIQUID ADMIXTURE WHEREIN SAID LIQUID ADMIXTURE IS SELECTED FROM THE GROUP CONSISTING OF A LIQUID MIXTURE CONTAINING PARA-XYLENE AND META-XYLENE HAVING A COMPOSITION SUCH THAT ONLY PARAXYLENE IS INTIALLY CRYSTALLIZED THEREFROM A LIQUID MIXTURE CONTAINING BENZENE AND HEXANES HAVING A SIMILAR BOILING POINT, SAID BENZENE CONTAINING LIQUID MIXTURE HAVING A COMPOSITION SUCH THAT ONLY BENZENE IS INTIALLY CRYSTALLIZED THEREFROM AND A LIQUID MIXTURE CONTAINING CYCLOHEXANE AND OTHER C6 HYDROCARBONS HAVING A SIMILAR BOILING POINT, SAID CYCLOHEXANE CONTAINING MIXTURE HAVING A COMPOSITION SUCH THAT ONLY CYCLOHEXANE IS INITIALLY CRYSTALLIZED THEREFROM, WHICH COMPRISES SUBJECTING SAID LIQUID ADMIXTURE TO AN ELEVATED PRESSURE IN EXCESS OF 2000 P.S.I.G., ADJUSTING THE TEMPERATURE OF SAID LIQUID ADMIXTURE WHILE SAID ADMIXTURE IS SUBJECTED TO SAID PRESSURE TO CRYSTALLIZED A COMPONENT THEREFROM, AND RECOVERING THE RESULTING CRYSTALLIZED COMPONENT.
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) | 1960-12-16 | 1961-06-17 | 1961-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-16 | 1965-06-17 | 1965-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-16 | 1969-06-17 | 1969-12-17 | $7700.00 | Window Closed / Lapsed |