Patent US4227173A successfully refreshed from Google Patents.
Patent US3707575A successfully refreshed from Google Patents.
US3707575A
Expired / Lapsed
US
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Process for separating c5 hydrocarbons by solvent extraction and extractive distillation
Assignee: GEA Group AG
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Filing: 1970-08-11
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Granted: 1972-12-26
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Expires: 1990-08-11
Abstract
Abstract A C5 HYDROCARBON MIXTURE IS SEPARATED BY REMOVING MONOOLEFINS AND PARAFFINS FROM THE MIXTURE BY SOLVENT EXTRACTION FOLLOWED BY EXTRACTIVE DISTILLATION. THE BOTTOMS PRODUCT (DISTILLAND) FROM THE DISTILLATION STEP IS THEN EXTRACTIVELY DISTILLED A SECOND TIME AND A MIXTURE OF ISOPRENE AND CO-DISTILLED CYCLOPENTADIENE IS OBTAINED AS THE DISTILLATE WHICH IS SUBJECT TO A SECOND SOLVENT EXTRACTION TO REMOVE THE CYCLOPENTADIENE. THE BOTTOMS PRODUCT FROM THE SECOND DISTILLATION STEP IS FURTHERDISTILLED TO RECOVER CYCLOPENTADIENE AS THE DISTILLATE AND SOLVENT WHICH IS RECYLCED TO THE FIRST AND SECOND SOLVENT EXTRACTION STEPS.
Inventors
- 👤 Eckart Meller
- 👤 Karl Heinz Eisenlohr
- 👤 Helmut Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:27
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/04; B01D11/0488; C; C07; C07C; C07C7/00; C07C7/005; C07C7/04; C07C7/05; C07C7/08; C07C7/10
Claims Analysis
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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) | 1975-12-26 | 1976-06-26 | 1976-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-26 | 1980-06-26 | 1980-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-26 | 1984-06-26 | 1984-12-26 | $7700.00 | Window Closed / Lapsed |