Patent US3249532A successfully refreshed from Google Patents.
US3249532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent extraction of aromatics
Assignee: Individual
•
Filing: 1964-06-04
•
Granted: 1966-05-03
•
Expires: 1984-06-04
Abstract
No abstract record available.
Inventors
- 👤 Shiah Chyn Doug
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:45
CPC Classifications
C; C10; C10G; C10G21/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
A PROCESS OF TREATING A HYDROCARBON OIL FOR THE PURPOSE OF SEPARATING SAID OIL INTO FRACTIONS OF DIFFERING CHEMICAL COMPOSITIONS WHICH COMPRISES CONTACTING HYDROCARBON OIL FEED WITH DIMETHYL FORMAMIDE TO PRODUCE A PRIMARY RAFFINATE CONTAINING THE PORTION OF SAID HYDROCARBON OIL FEED RICH IN NON-AROMATIC COMPONENTS TOGETHER WITH A MINOR PORTION OF THE DIMETHYL FORMAMIDE PRIMARY SOLVENT AND A PRIMARY EXTRACT CONTAINING THE AROMATIC HYDROCARBON TOGETHER WITH A MAJOR PORTION OF SAID DIMETHYL FORMAMIDE, WATER WASHING SAID PRIMARY RAFFINATE TO REMOVE SAID MINOR PORTION OF SAID DIMETHYL FORMAMIDE, WHEREBY THE PRODUCT HYDROCARBON STREAM RICH IN NONAROMATIC COMPONENTS IS PRODUCED SOLELY BY TREATMENT WITH DIMETHYL FORMAMIDE AND WATER, CONTRACTING SAID PRIMARY EXTRACT WITH A SECONDARY PARRAFFINIC HYDROCARBON SOLVENT, SAID SECONDARY HYDROCARBON SOLVENT BEING SUBSTANTIALLY INSOLUBLE IN SAID DIMETHYL FORMAMIDE AND HAVING A BOILING RANGE DIFFERING BY AT LEAST 50*F. FROM THE BOILING RANGE OF SAID HYDROCARBON OIL FEED, THEREBY PRODUCING A SECONDARY RAFFINATE CONSISTING ESSENTIALLY OF SAID
Claim 2
Dependent Claim
156 words
A PROCESS OF TREATING A HYDROCARBON OIL FOR THE PURPOSE OF SEPARATING SAID OIL INTO FRACTIONS OF DIFFERING CHEMICAL COMPOSITIONS WHICH COMPRISES CONTACTING HYDROCARBON OIL FEED WITH DIMETHYL FORMAMIDE TO PRODUCE A PRIMARY RAFFINATE CONTAINING THE PORTION OF SAID HYDROCARBON OIL FEED RICH IN NON-AROMATIC COMPONENTS TOGETHER WITH A MINOR PORTION OF THE DIMETHYL FORMAMIDE PRIMARY SOLVENT AND A PRIMARY EXTRACT CONTAINING THE AROMATIC HYDROCARBON TOGETHER WITH A MAJOR PORTION OF SAID DIMETHYL FORMAMIDE, WATER WASHING SAID PRIMARY RAFFINATE TO REMOVE SAID MINOR PORTION OF SAID DIMETHYL FORMAMIDE, WHEREBY THE PRODUCT HYDROCARBON STREAM RICH IN NONAROMATIC COMPONENTS IS PRODUCED SOLELY BY TREATMENT WITH DIMETHYL FORMAMIDE AND WATER, CONTRACTING SAID PRIMARY EXTRACT WITH A SECONDARY PARRAFFINIC HYDROCARBON SOLVENT, SAID SECONDARY HYDROCARBON SOLVENT BEING SUBSTANTIALLY INSOLUBLE IN SAID DIMETHYL FORMAMIDE AND HAVING A BOILING RANGE DIFFERING BY AT LEAST 50*F. FROM THE BOILING RANGE OF SAID HYDROCARBON OIL FEED, THEREBY PRODUCING A SECONDARY RAFFINATE CONSISTING ESSENTIALLY OF SAID
References Cited (Backward Citations)
US2176396A
Cited
US2167632A
Cited
US2261799A
Cited
US2307242A
Cited
US2357344A
Cited
US2646387A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |