Patent US2848518A successfully refreshed from Google Patents.
US2848518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
C8 aromatic hydrocarbon separation
Assignee: Standard Oil Co
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Filing: 1954-07-26
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Granted: 1958-08-19
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Expires: 1974-07-26
Abstract
No abstract record available.
Inventors
- 👤 Fragen Nathan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:01
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/14; C07C7/005; C07C7/148; C07C7/152
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A PROCESS WHICH COMPRISES (1) CONTACTING UNDER SUBSTANTIALLY ANDHYDROUS CONDITIONS (A) A FEED CONTAINING O-XYLENE, M-XYLENE, P-XYLENE AND ETHYLBENZENE AS ESSENTIALLY THE ONLY XYLENE BOILING RANGE HYDROCARBON CONSTITUENTS AND ESSENTIALLY NO HYDROCARBONS REACTIVE THEREWITH, WITH (B) AN HF-BF3 TREATING AGENT CONSISTING ESSENTIALLY OF ABOUT 1 MOLE OF BF3 PER MOLE ON M-XYLENE PLUS NOT MORE THAN 0.5 MOLE OF BF3 PER MOLE OF ETHYLBENZENE AND BETWEEN ABOUT 5 AND 50 MOLES OF LIQUID HF PER MOLE OF M-XYLENE AT (C) A TEMPERATURE BETWEEN ABOUT -40*C. AND +30*C. FOR A TIME BETWEEN ABOUT 2 MINUTES AND 30 MINUTES, TO ESSENTIALLY AVOID ISOMERIZATION OF O-XYLENE AND P-XYLENE, (2) SEPARATING A RAFFINATE PHASE COMPRISING BENZENE, O-XYLENE, P-XYLENE AND ETHYLBENZENE FROM AN EXTRACT PHASE COMPRISING HF, BF3, M-XYLENE, C10 AROMATIC HYDROCARBONS AND SUBSTANTIALLY
Claim 2
Dependent Claim
129 words
A PROCESS WHICH COMPRISES (1) CONTACTING UNDER SUBSTANTIALLY ANDHYDROUS CONDITIONS (A) A FEED CONTAINING O-XYLENE, M-XYLENE, P-XYLENE AND ETHYLBENZENE AS ESSENTIALLY THE ONLY XYLENE BOILING RANGE HYDROCARBON CONSTITUENTS AND ESSENTIALLY NO HYDROCARBONS REACTIVE THEREWITH, WITH (B) AN HF-BF3 TREATING AGENT CONSISTING ESSENTIALLY OF ABOUT 1 MOLE OF BF3 PER MOLE ON M-XYLENE PLUS NOT MORE THAN 0.5 MOLE OF BF3 PER MOLE OF ETHYLBENZENE AND BETWEEN ABOUT 5 AND 50 MOLES OF LIQUID HF PER MOLE OF M-XYLENE AT (C) A TEMPERATURE BETWEEN ABOUT -40*C. AND +30*C. FOR A TIME BETWEEN ABOUT 2 MINUTES AND 30 MINUTES, TO ESSENTIALLY AVOID ISOMERIZATION OF O-XYLENE AND P-XYLENE, (2) SEPARATING A RAFFINATE PHASE COMPRISING BENZENE, O-XYLENE, P-XYLENE AND ETHYLBENZENE FROM AN EXTRACT PHASE COMPRISING HF, BF3, M-XYLENE, C10 AROMATIC HYDROCARBONS AND SUBSTANTIALLY
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) | 1961-08-18 | 1962-02-17 | 1962-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-18 | 1966-02-17 | 1966-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-18 | 1970-02-17 | 1970-08-19 | $7700.00 | Window Closed / Lapsed |