US2559520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extractive distillation of alcohols with glycols
Assignee: Standard Oil Development Co
•
Filing: 1948-05-01
•
Granted: 1951-07-03
•
Expires: 1968-05-01
Abstract
No abstract record available.
Inventors
- 👤 Jr Paul V Smith
- 👤 Carl S Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:09
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74; C07C29/76; C07C29/80; C07C29/84
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
115 words
THE METHOD OF SEPARATING LOWER AND HIGHER MOLECULAR WEIGHT SATURATED MONOHYDRIC ALCOHOLS CONTAINING 3 TO 5 CARBON ATOMS PER MOLECULE AND HAVING NORMAL BOILING POINTS ABOVE THAT OF ISOPROPANOL AND WHICH FORM CLOSE-BOILING MIXTURES DIFFICULT TO SEPARATE BY ORDINARY FRACTIONAL DISTILLATION, WHICH COMPRISES CONTINUOUSLY INTRODUCING A FEED MIXTURE OF SAID ALCOHOLS TO A FRACTIONAL DISTILLATION ZONE WHEREIN VAPORS OF SAID ALCOHOLS ASCEND COUNTERCURRENTLY TO LIQUID REFLUX OF THE ALCOHOLS DISSOLVED IN 70 TO 99 VOLUME PERCENT OF A GLYCOL TO EFFECT VAPORIZATION OF LOWER MOLECULAR WEIGHT ALCOHOL, CONTINUOUSLY REMOVING VAPOR OF LOWER MOLECULAR WEIGHT ALCOHOL OVERHEAD FROM THE FRACTIONAL DISTILLATION ZONE AND REMOVING A SOLUTION OF HIGHER MOLECULAR WEIGHT ALCOHOL IN THE GLYCOL AS BOTTOMS.
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) | 1954-07-02 | 1955-01-01 | 1955-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-02 | 1959-01-01 | 1959-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-02 | 1963-01-01 | 1963-07-03 | $7700.00 | Window Closed / Lapsed |