US2728803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of ethylbenzene from other c8 aromatic hydrocarbons by extraction with hf-bf3
Assignee: Standard Oil Co
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Filing: 1951-12-28
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Granted: 1955-12-27
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Expires: 1971-12-28
Abstract
No abstract record available.
Inventors
- 👤 David A Mccaulay
- 👤 Arthur P Lien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:05
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/152
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
IN A PROCESS FOR SEPARATING ETHYLBENZENE FROM DIMETHYLBENZENES IN A FEED COMPRISING ETHYLBENZENE AND AT LEST ONE DIMETHYLBENZENE BY MEANS OF AN EXTRACTANT CONSISTING OF HF AND BF3, THE IMPROVEMENT WHICH COMPRISES ADJUSTING THE CONCENTRATION OF BF3 IN SAID EXTRACTANT TO CORRESPOND TO NOT LESS THAN 0.9 MOLE AND NOT MORE THAN 1.5 MOLE OF BF3 PER MOLE OF TOTAL DIMETHYLBENZENES IN SAID FEED, CONTACTING SAID FEED WITH SAID EXTRACTION AT A TEMPERATURE WITHIN THE RANGE OF FROM ABOUT -25* C. TO ABOUT -50* C. FOR A PERIOD NOT IN EXCESS OF ABOUT FIVE MINUTES AND SEPARATING THE CONTACT MIXTURE TO OBTAIN AN EXTRACT CONTAINING SUBSTANTIALLY ALL OF THE DIMETHYLBENZENE AND RAFFINATE CONTAINING THE MAJOR PART OF THE ETHYLBENZENE.
Claim 2
Dependent Claim
119 words
IN A PROCESS FOR SEPARATING ETHYLBENZENE FROM DIMETHYLBENZENES IN A FEED COMPRISING ETHYLBENZENE AND AT LEST ONE DIMETHYLBENZENE BY MEANS OF AN EXTRACTANT CONSISTING OF HF AND BF3, THE IMPROVEMENT WHICH COMPRISES ADJUSTING THE CONCENTRATION OF BF3 IN SAID EXTRACTANT TO CORRESPOND TO NOT LESS THAN 0.9 MOLE AND NOT MORE THAN 1.5 MOLE OF BF3 PER MOLE OF TOTAL DIMETHYLBENZENES IN SAID FEED, CONTACTING SAID FEED WITH SAID EXTRACTION AT A TEMPERATURE WITHIN THE RANGE OF FROM ABOUT -25* C. TO ABOUT -50* C. FOR A PERIOD NOT IN EXCESS OF ABOUT FIVE MINUTES AND SEPARATING THE CONTACT MIXTURE TO OBTAIN AN EXTRACT CONTAINING SUBSTANTIALLY ALL OF THE DIMETHYLBENZENE AND RAFFINATE CONTAINING THE MAJOR PART OF THE ETHYLBENZENE.
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) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |