Patent US2552412A successfully refreshed from Google Patents.
US2552412A
Expired / Lapsed
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Purification of aliphatic alcohols by extractive distillation
Assignee: Standard Oil Development Co
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Filing: 1949-07-16
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Granted: 1951-05-08
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Expires: 1969-07-16
Abstract
No abstract record available.
Inventors
- 👤 Jr William M Drout
- 👤 Joseph W Dowling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:31
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74; C07C29/76; C07C29/80; C07C29/84
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
THE METHOD OF REFINING A CRUDE ALIPHATIC ALCOHOL CONTAINING 2 TO 6 CARBON ATOMS PER MOLECULE PRODUCED BY REACTION OF A MONO-OLEFIN, SAID CRUDE ALCOHOL CONTAINING CONTAMINANTS LOWER BOILING AND HIGHER BOILING THAN THE ALCOHOL, WHICH COMPRISES CONTINUOULSY FREDING THE CRUDE ALCOHOL TO A FRACTIONAL DISTILLATION ZONE AT AN INTERMEDIATE POINT THEREOF, CONTINUOUSLY ADDING A SUFFICIENT AMOUNT OF A SOLVENT CONSISTING OF A 20-80 VOL. PER CENT AQUEOUS SOLUTION OF A SUBSTANCE SELECTED FORM THE GROUP CONSISTING OF A ALIPHATIC GLYCOLS, GLYCOL-ETHERS AND GLYCOL-ESTERS, TO THE FRACTIONAL DISTILLATION ZONE AT A POINT SUBSTANTIALLY ABOVE THE CRUDE ALCOHOL FEED POINT TO MAINTAIN AN IN-
Claim 2
Independent Claim
103 words
THE METHOD OF REFINING A CRUDE ALIPHATIC ALCOHOL CONTAINING 2 TO 6 CARBON ATOMS PER MOLECULE PRODUCED BY REACTION OF A MONO-OLEFIN, SAID CRUDE ALCOHOL CONTAINING CONTAMINANTS LOWER BOILING AND HIGHER BOILING THAN THE ALCOHOL, WHICH COMPRISES CONTINUOULSY FREDING THE CRUDE ALCOHOL TO A FRACTIONAL DISTILLATION ZONE AT AN INTERMEDIATE POINT THEREOF, CONTINUOUSLY ADDING A SUFFICIENT AMOUNT OF A SOLVENT CONSISTING OF A 20-80 VOL. PER CENT AQUEOUS SOLUTION OF A SUBSTANCE SELECTED FORM THE GROUP CONSISTING OF A ALIPHATIC GLYCOLS, GLYCOL-ETHERS AND GLYCOL-ESTERS, TO THE FRACTIONAL DISTILLATION ZONE AT A POINT SUBSTANTIALLY ABOVE THE CRUDE ALCOHOL FEED POINT TO MAINTAIN AN IN-
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) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |