Patent US2739992A successfully refreshed from Google Patents.
US2739992A
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Extraction of ethylbenzene from naphthas with hf-agf
Assignee: Standard Oil Co
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Filing: 1951-11-20
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Granted: 1956-03-27
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Expires: 1971-11-20
Abstract
No abstract record available.
Inventors
- 👤 Arthur P Lien
- 👤 David A Mccaulay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:02
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/10; C07C7/148; C07C7/152
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A PROCESS WHICH COMPRISES CONTACTING, AT A TEMPERATURE BETWEEN ABOUT 30* F. AND 160* F., A FEED CONSISTING OF C8 AROMATIC HYDROCARBONS AND CONTAINING ETHYLBENZENE AND AT LEAST ONE XYLENE WITH A TREATING AGENT CONSISTING OF LIQUID HF IN AN AMOUNT BETWEEN 10 AND 1500 VOLUME PERCENT, BASED ON FEED, AND AGF IN AN AMOUNT OF BETWEEN ABOUT ONE-QUARTER AND ONE-THIRD MOLE PER MOLE OF XYLENE IN SAID FEED, THEREBY FORMING AN EXTRACT PHASE COMPRISING HF, AGF AND HYDROCRBONS IN A MOLE RATIO OF XYLENE TO ETHYLBENZENE GREATER THAN IN SAID FEED AND A RAFFINATE PHASE COMPRISING HYDROCARBONS IN A MOLE RATIO OF XYLENE TO ETHYLBENZENE LOWER THAN IN SAID FEED, SEPARATING SAID PHASE AND RECOVERING HYDROCARBONS FROM SAID PHASES.
Claim 2
Dependent Claim
120 words
A PROCESS WHICH COMPRISES CONTACTING, AT A TEMPERATURE BETWEEN ABOUT 30* F. AND 160* F., A FEED CONSISTING OF C8 AROMATIC HYDROCARBONS AND CONTAINING ETHYLBENZENE AND AT LEAST ONE XYLENE WITH A TREATING AGENT CONSISTING OF LIQUID HF IN AN AMOUNT BETWEEN 10 AND 1500 VOLUME PERCENT, BASED ON FEED, AND AGF IN AN AMOUNT OF BETWEEN ABOUT ONE-QUARTER AND ONE-THIRD MOLE PER MOLE OF XYLENE IN SAID FEED, THEREBY FORMING AN EXTRACT PHASE COMPRISING HF, AGF AND HYDROCRBONS IN A MOLE RATIO OF XYLENE TO ETHYLBENZENE GREATER THAN IN SAID FEED AND A RAFFINATE PHASE COMPRISING HYDROCARBONS IN A MOLE RATIO OF XYLENE TO ETHYLBENZENE LOWER THAN IN SAID FEED, SEPARATING SAID PHASE AND RECOVERING HYDROCARBONS FROM SAID PHASES.
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) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |