Patent US2591877A successfully refreshed from Google Patents.
US2591877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of alcohols by azeotropic distillation
Assignee: Celanese Corp
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Filing: 1948-09-21
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Granted: 1952-04-08
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Expires: 1968-09-21
Abstract
No abstract record available.
Inventors
- 👤 Nat C Robertson
- 👤 Robert H Buchanan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:21
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74; C07C29/76; C07C29/80; C07C29/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
IN A PROCESS FOR THE REMOVAL OF ACETALS, CARBONYL COMPOUNDS AND OXIDES FROM A MIXTURE COMPRISING ESSENTIALLY N-PROPANOL, ISOBUTANOL, SECONDARY BUTANOL AND N-BUTANOL WHEREIN SAID ESTERS, ACETALS, CARBONYL COMPOUNDS, AND OXIDES ARE PRESENTS AS IMPURITIES, THE STEPS WHICH COMPRISES FRACTIONATING THE MIXTURE TO SEPARATE FROM THE SAME A CRUDE FRACTION BOILING AT FROM ABOUT 96 TO 103* C. AND A CRUDE FRACTION BOILING AT FROM ABOUT 103 TO 120* C. AND THEN SUBJECTING EACH OF SAID FRACTIONS TO AZEOTRPIC DISTILLATION EMPOLYING METHYL-CYCLOHEXANE AS THE ALCOHOL ENTRAINING AGENT, WHEREBY THE SAID ALCOHOLS ARE REMOVED FROM SAID FRACTIONS.
Claim 2
Dependent Claim
96 words
IN A PROCESS FOR THE REMOVAL OF ACETALS, CARBONYL COMPOUNDS AND OXIDES FROM A MIXTURE COMPRISING ESSENTIALLY N-PROPANOL, ISOBUTANOL, SECONDARY BUTANOL AND N-BUTANOL WHEREIN SAID ESTERS, ACETALS, CARBONYL COMPOUNDS, AND OXIDES ARE PRESENTS AS IMPURITIES, THE STEPS WHICH COMPRISES FRACTIONATING THE MIXTURE TO SEPARATE FROM THE SAME A CRUDE FRACTION BOILING AT FROM ABOUT 96 TO 103* C. AND A CRUDE FRACTION BOILING AT FROM ABOUT 103 TO 120* C. AND THEN SUBJECTING EACH OF SAID FRACTIONS TO AZEOTRPIC DISTILLATION EMPOLYING METHYL-CYCLOHEXANE AS THE ALCOHOL ENTRAINING AGENT, WHEREBY THE SAID ALCOHOLS ARE REMOVED FROM SAID FRACTIONS.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-08 | 1955-10-08 | 1956-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-08 | 1959-10-08 | 1960-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-08 | 1963-10-08 | 1964-04-08 | $7700.00 | Window Closed / Lapsed |