US3591490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of separating pure aromatic hydrocarbons from hydrocarbon mixtures
Assignee: GEA Group AG
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Filing: 1969-11-14
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Granted: 1971-07-06
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Expires: 1989-11-14
Abstract
Abstract IN THE RECOVERY OF AROMATIC HYDROCARBON FROM MIXTURES CONTAINING SAME BY EXTRACTIVE DISTILLATION UTILIZING A SELECTIVE SOLVENT, A PURER PRODUCT IN A GREATER YIELD CAN BE ACHIEVED BY PASSING A PORTION OF THE MAIN SOLVENT STREAM USED IN THE DISTILLATION COLUMN DIRECTLY TO A COUNTERCURRENT EXTRACTION UNIT FOR CONTACT WITH THE RAFFINATE FROM THE DISTILLATION COLUMN PASSING IN COUNTERCURRENT FLOW WITH WATER TO PRODUCE A PRODUCT MIXTURE FROM WHICH, AFTER SUBSEQUENT STRIPPING IN STRIPPING COLUMN, AROMATIC HYDROCARBONS CAN BE RECOVERED WHICH WOULD HAVE OTHERWISE BEEN LOST.
Inventors
- 👤 Eckart Muller
- 👤 Bergen Enkheim
- 👤 Kamar Percy John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:28
CPC Classifications
C; C10; C10G; C10G7/00; C10G7/08; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |