US2638440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of crude aliphatic alcohols
Assignee: Standard Oil Development Co
•
Filing: 1948-05-01
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Granted: 1953-05-12
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Expires: 1968-05-01
Abstract
No abstract record available.
Inventors
- 👤 Jr William M Drout
- 👤 Carl S Carlson
- 👤 Harold W Scheeline
- 👤 Jr Paul V Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:26
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74; C07C29/76; C07C29/80; C07C29/84; Y; Y10; Y10S; Y10S203/00; Y10S203/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
THE METHOD OF REFINING A C2 TO C5 CRUDE ALIPHATIC MONO-HYDRIC ALCOHOL PRODUCED BY THE SULFURIC ACID-CATALYZED HYDRATION OF A SINGLE C2 TO C5 MONO-OLEFIN, SAID CRUDE ALCOHOL CONTAINING CONTAMINANTS LOWER BOILING AND HIGHER BOILING THAN THE ALCOHOL BUT SUBSTANTIALLY FREE OF ANY OTHER ALCOHOL CLOSE-BOILING THERETO, SAID HIGHER BOILING CONTAMINANTS COMPRISING POLYMER OILS BOILING IN THE RANGE OF 100* C. TO 300* C., WHICH COMPRISES CONTINUOUSLY FEEDING THE CRUDE ALCOHOL TO A FRACTIONAL DISTILLATION ZONE AT AN INTERMEDIATE POINT THEREOF, CONTINUOUSLY FEEDING WATER TO THE FRACTIONAL DISTILLATION ZONE AT A POINT SUBSTANTIALLY ABOVE THE CRUDE ALCOHOL FEED POINT TO MAINTAIN AN INTERNAL LIQUID REFLUX HAVING A WATER CONTENT IN THE RANGE OF 65 TO 99.9 MOL PERCENT BELOW THE POINT OF ADDITION OF THE WATER, DISTILLING FROM SAID CRUDE ALCOHOL A VAPOROUS MIXTURE COMPRISING ALL BUT TRACES OF THE LOWER BOIL-
Claim 2
Independent Claim
142 words
THE METHOD OF REFINING A C2 TO C5 CRUDE ALIPHATIC MONO-HYDRIC ALCOHOL PRODUCED BY THE SULFURIC ACID-CATALYZED HYDRATION OF A SINGLE C2 TO C5 MONO-OLEFIN, SAID CRUDE ALCOHOL CONTAINING CONTAMINANTS LOWER BOILING AND HIGHER BOILING THAN THE ALCOHOL BUT SUBSTANTIALLY FREE OF ANY OTHER ALCOHOL CLOSE-BOILING THERETO, SAID HIGHER BOILING CONTAMINANTS COMPRISING POLYMER OILS BOILING IN THE RANGE OF 100* C. TO 300* C., WHICH COMPRISES CONTINUOUSLY FEEDING THE CRUDE ALCOHOL TO A FRACTIONAL DISTILLATION ZONE AT AN INTERMEDIATE POINT THEREOF, CONTINUOUSLY FEEDING WATER TO THE FRACTIONAL DISTILLATION ZONE AT A POINT SUBSTANTIALLY ABOVE THE CRUDE ALCOHOL FEED POINT TO MAINTAIN AN INTERNAL LIQUID REFLUX HAVING A WATER CONTENT IN THE RANGE OF 65 TO 99.9 MOL PERCENT BELOW THE POINT OF ADDITION OF THE WATER, DISTILLING FROM SAID CRUDE ALCOHOL A VAPOROUS MIXTURE COMPRISING ALL BUT TRACES OF THE LOWER BOIL-
References Cited (Backward Citations)
US996328A
Cited
US887793A
Cited
US1929901A
Cited
US2080111A
Cited
US2148846A
Cited
US2290442A
Cited
US2290636A
Cited
US2411808A
Cited
GB598436A
Cited
US2551593A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |