US2620294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extractive distillation of closeboiling alcohols
Assignee: Standard Oil Development Co
•
Filing: 1949-04-15
•
Granted: 1952-12-02
•
Expires: 1969-04-15
Abstract
No abstract record available.
Inventors
- 👤 Carl S Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:50
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74; C07C29/76; C07C29/80; C07C29/84
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
133 words
IN THE SEPARATION OF A NORMAL PRIMARY ALCOHOL, FROM A BRANCHED ALCOHOL BY EXTRACTIVE DISTILLATION EMPLOYING WATER AS THE EXTRACTIVE DISTILLATION SOLVENT TO MODIFY THE RELATIVE VOLATILITIES OF SAID ALCOHOLS, HAVING 2 TO 4 CARBON ATOMS PER MOLECULE AND FORMING AQUEOUS AZEOTROPES WHICH HAVE BOILING POINTS THAT DIFFER BY LESS THAN 5* C. THE IMPROVEMENT WHICH COMPRISES DISTILLING A MIXTURE OF SAID ALCOHOLS IN THE PRESENCE OF 80-85 MOL. % WATER TO OBTAIN A FIRST DISTILLATE COMPRISING A HIGHER PROPORTION OF BRANCHED ALCOHOL THAN NORMAL ALCOHOL AND A BOTTOMS COMPRISING AN AQUEOUS SOLUTION OF NORMAL ALCOHOL, AND FRACTIONALLY DISTILLING THE FIRST DISTILLATE IN THE PRESENCE OF A SUBSTANTIALLY HIGHER PROPORTION OF WATER IN THE RANGE OF 90-100 MOL. % WATER TO OBTAIN A SECOND DISTILLATE COMPRISING BRANCHED ALCOHOL SUBSTANTIALLY FREE OF NORMAL ALCOHOL.
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) | 1955-12-02 | 1956-06-02 | 1956-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-02 | 1960-06-02 | 1960-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-02 | 1964-06-02 | 1964-12-02 | $7700.00 | Window Closed / Lapsed |