Patent US2551593A successfully refreshed from Google Patents.
US2551593A
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US
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Extractive distillation of alcohols from close-boiling aqueous mixtures
Assignee: Standard Oil Development Co
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Filing: 1947-01-28
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Granted: 1951-05-08
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Expires: 1967-01-28
Abstract
No abstract record available.
Inventors
- 👤 Edwin R Gilliland
- 👤 Charles E Morrell
- 👤 Carl S Carlson
- 👤 Nat C Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:26
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74; C07C29/76; C07C29/80; C07C29/84
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
THE METHOD OF SEPARATING WATER-MISCIBLE ALCOHOLS WHICH FORM CLOSE-BOILING AQUEOUS AZEOTROPES DIFFICULT TO SEPARATE BY ORDINARY FRACTIONAL DISTILLATION IN HAVING BOILING POINTS WHICH DIFFER BY LESS THAN 5* C., ONE OF SAID ALCOHOLS HAVING A HIGHER MOLECULAR WEIGHT THAN THE OTHER, WHICH COMPRISES CONTINUOUSLY INTRODUCING A FEED MIXTURE OF SAID ALCOHOLS TO A FRACTIONAL DISTILLATION ZONE WHEREIN VAPORS OF SAID ALCOHOLS WITH WATER VAPOR ASCEND COUNTERCURRENTLY TO LIQUID REFLUX OF THE ALCOHOLS DISSOLVED IN SUFICIENTLY HIGHER PROPORTION OF WATER TO EFFECT VAPORIZATION OF A LARGER PART OF THE HIGHER MOLECULAR WEIGHT ALCOHOL THAN OF THE OTHER ALCOHOL IN SAID REFLUX, CONTINUOUSLY INTRODUCING WATER IN SAID LIQUID REFLUX, THE FRACTIONAL DISTILLATION ZONE TO MAINTAIN AT LEAST 65 MOL PER CENT WATER IN SAID LIQUID REFLUX, CONTINUOUSLY REMOVING VAPOR OF THE HIGHER MOLECULAR WEIGHT ALCOHOL WITH WATER VAPOR OVERHEAD FROM THE FRACTIONAL DISTILLATION ZONE, AND REMOVING A DILUTE AQUEOUS SOLUTION OF THE OTHER ALCOHOL AS BOTTOMS.
Claim 2
Independent Claim
154 words
THE METHOD OF SEPARATING WATER-MISCIBLE ALCOHOLS WHICH FORM CLOSE-BOILING AQUEOUS AZEOTROPES DIFFICULT TO SEPARATE BY ORDINARY FRACTIONAL DISTILLATION IN HAVING BOILING POINTS WHICH DIFFER BY LESS THAN 5* C., ONE OF SAID ALCOHOLS HAVING A HIGHER MOLECULAR WEIGHT THAN THE OTHER, WHICH COMPRISES CONTINUOUSLY INTRODUCING A FEED MIXTURE OF SAID ALCOHOLS TO A FRACTIONAL DISTILLATION ZONE WHEREIN VAPORS OF SAID ALCOHOLS WITH WATER VAPOR ASCEND COUNTERCURRENTLY TO LIQUID REFLUX OF THE ALCOHOLS DISSOLVED IN SUFICIENTLY HIGHER PROPORTION OF WATER TO EFFECT VAPORIZATION OF A LARGER PART OF THE HIGHER MOLECULAR WEIGHT ALCOHOL THAN OF THE OTHER ALCOHOL IN SAID REFLUX, CONTINUOUSLY INTRODUCING WATER IN SAID LIQUID REFLUX, THE FRACTIONAL DISTILLATION ZONE TO MAINTAIN AT LEAST 65 MOL PER CENT WATER IN SAID LIQUID REFLUX, CONTINUOUSLY REMOVING VAPOR OF THE HIGHER MOLECULAR WEIGHT ALCOHOL WITH WATER VAPOR OVERHEAD FROM THE FRACTIONAL DISTILLATION ZONE, AND REMOVING A DILUTE AQUEOUS SOLUTION OF THE OTHER ALCOHOL 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) | 1954-05-07 | 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 |