Patent US606460A successfully refreshed from Google Patents.
US2591671A
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Dehydration of alcohols by extractive distillation
Assignee: Standard Oil Development Co
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Filing: 1948-09-17
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Granted: 1952-04-08
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Expires: 1968-09-17
Abstract
No abstract record available.
Inventors
- 👤 William E Catterall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:02
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74; C07C29/76; C07C29/80; C07C29/84
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
THE METHOD OF DEHYDRATING AQUEOUS WATER MISCIBLE ALCOHOL OF 2 TO 4 CARBON ATOMS PER MOLECULE WHICH COMPRISES CONTINUOUSLY FEEDING THE AQEUOUS WATER MISCIBLE ALCOHOL TO A FRACTIONAL DISTILLATION ZONE AT AN INTERMEDATE POINT THEREOF, CONTINUOUSLY ADDING SUFFICIENT WATE RIMMISCIBLE ALCOHOL OF 4 TO 6 CARBON ATOMS PER MOLECULE TO THE FRACTIONAL DISTILLATION ZONE SUBSTANTIALLY ABOVE THE AQUEOUS ALCOHOL FEED POINT TO MAINTAIN AN INTERNAL LIQUID REFLUX HAVING A WATER IMMISCIBLE ALCOHOL CONTENT IN THE RANGE ABOVE 50 MOL PER CENT BELOW THE POINT OF ADDITION OF THE WATER IMMICIBLE ALCOHOL, DISTILLING FROM SAID AQUEOUS WATER MISCIBLE ALCOHOL A VAPOROUS MIXTURE COMPRISING WATER WHEREIN THE DISTILLED VAPOROUS MIXTURE FLOWS COUNTERCURRENT TO THE WATER IMMISCIBLE ALCOHOL REFLUX, AND WITHDRAWING A DEHYDRATED SOLUTION OF THE WATER MISCIBLE AND THE WATER IMMISCIBLE ALCOHOL FROM A LOWER PORTION OF THE FRACTIONAL DISTILLATION ZONE.
Claim 2
Independent Claim
139 words
THE METHOD OF DEHYDRATING AQUEOUS WATER MISCIBLE ALCOHOL OF 2 TO 4 CARBON ATOMS PER MOLECULE WHICH COMPRISES CONTINUOUSLY FEEDING THE AQEUOUS WATER MISCIBLE ALCOHOL TO A FRACTIONAL DISTILLATION ZONE AT AN INTERMEDATE POINT THEREOF, CONTINUOUSLY ADDING SUFFICIENT WATE RIMMISCIBLE ALCOHOL OF 4 TO 6 CARBON ATOMS PER MOLECULE TO THE FRACTIONAL DISTILLATION ZONE SUBSTANTIALLY ABOVE THE AQUEOUS ALCOHOL FEED POINT TO MAINTAIN AN INTERNAL LIQUID REFLUX HAVING A WATER IMMISCIBLE ALCOHOL CONTENT IN THE RANGE ABOVE 50 MOL PER CENT BELOW THE POINT OF ADDITION OF THE WATER IMMICIBLE ALCOHOL, DISTILLING FROM SAID AQUEOUS WATER MISCIBLE ALCOHOL A VAPOROUS MIXTURE COMPRISING WATER WHEREIN THE DISTILLED VAPOROUS MIXTURE FLOWS COUNTERCURRENT TO THE WATER IMMISCIBLE ALCOHOL REFLUX, AND WITHDRAWING A DEHYDRATED SOLUTION OF THE WATER MISCIBLE AND THE WATER IMMISCIBLE ALCOHOL FROM A LOWER PORTION OF THE FRACTIONAL DISTILLATION ZONE.
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) | 1955-04-08 | 1955-10-08 | 1956-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-08 | 1959-10-08 | 1960-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-08 | 1963-10-08 | 1964-04-08 | $7700.00 | Window Closed / Lapsed |