US2753386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of ethylxylene by extraction with hf-bf3
Assignee: Standard Oil Co
•
Filing: 1953-02-02
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Granted: 1956-07-03
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Expires: 1973-02-02
Abstract
No abstract record available.
Inventors
- 👤 David A Mccaulay
- 👤 Arthur P Lien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:28
CPC Classifications
C; C07; C07C; C07C6/00; C07C6/08; C07C6/12; C07C6/126; C07C7/00; C07C7/148; C07C7/152
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A METHOD OF SEPARATING 1,3,5-ETHYLXYLENE FROM METADIETHYLBENZENES, WHICH METHOD COMPRISES CONTACTING UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS A FEED CONTAINING META-DIETHYLBENZENE AND 1,3,5-ETHYLXYLENE AS SUBSTANTIALLY THE ONLY AROMATIC HYDROCARBON CONSTITUENTS WITH AN AGENT CONTAINING NOT MORE THAN ABOUT 1 MOL OF BF3 PER MOL OF 1,3,5-ETHYLXYLENE IS SAID FEED AND AT LEAST SUFFICIENT LIQUID HF TO FORM SEPARATE EXTRACT AND RAFFINATE PHASES, AT A TEMPERATURE BELOW ABOUT +50* C. FOR A TIME AT LEAST SUFFICIENT TO SUBSTANTIALLY ATTAIN SEPARATION EQUILIBRIUM BETWEEN SAID PHASES, SEPARATING SAID PHASES AND RECOVERING FROM SAID EXTRACT PHASE AN ESSENTIALLY PURE 1,3,5-ETHYLXYLENE FRACTION.
Claim 2
Independent Claim
95 words
A METHOD OF SEPARATING 1,3,5-ETHYLXYLENE FROM METADIETHYLBENZENES, WHICH METHOD COMPRISES CONTACTING UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS A FEED CONTAINING META-DIETHYLBENZENE AND 1,3,5-ETHYLXYLENE AS SUBSTANTIALLY THE ONLY AROMATIC HYDROCARBON CONSTITUENTS WITH AN AGENT CONTAINING NOT MORE THAN ABOUT 1 MOL OF BF3 PER MOL OF 1,3,5-ETHYLXYLENE IS SAID FEED AND AT LEAST SUFFICIENT LIQUID HF TO FORM SEPARATE EXTRACT AND RAFFINATE PHASES, AT A TEMPERATURE BELOW ABOUT +50* C. FOR A TIME AT LEAST SUFFICIENT TO SUBSTANTIALLY ATTAIN SEPARATION EQUILIBRIUM BETWEEN SAID PHASES, SEPARATING SAID PHASES AND RECOVERING FROM SAID EXTRACT PHASE AN ESSENTIALLY PURE 1,3,5-ETHYLXYLENE FRACTION.
References Cited (Backward Citations)
US2528892A
Cited
US2564073A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-03 | 1960-01-02 | 1960-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-03 | 1964-01-02 | 1964-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-03 | 1968-01-02 | 1968-07-03 | $7700.00 | Window Closed / Lapsed |