US4481146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of an ethyl ester
Assignee: Hoechst AG
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Filing: 1981-09-29
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Granted: 1984-11-06
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Expires: 2001-09-29
Abstract
Abstract The invention relates to a process for the preparation of an ethyl ester from ethanol-containing mixtures of aliphatic alcohols, which comprises esterifying the alcohols with a carboxylic acid in the presence of an acid catalyst in a distilling column and separating in the same column the ethyl ester continuously from the ester mixture obtained. To this purpose, the alcohol mixture is introduced into the sump and the carboxylic acid is introduced into the column at a point located in the central part and the ethyl ester as well as the water formed during esterification are withdrawn continuously at the top of the column and the higher esters are withdrawn continuously at the sump.
Inventors
- 👤 Ernst I. Leupold
- 👤 Hans-Joachim Schmidt
- 👤 Knut Popp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:38
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/08; Y; Y10; Y10S; Y10S203/00; Y10S203/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
151 words
A process for the preparation of an ethyl ester from an ethanol containing mixture of aliphatic alcohols, which comprises: feeding a mixture of aliphatic alcohol to distillation column at a point located in the sump portion of said distillation column; feeding carboxylic acid to the distillation column at a point located near the middle of said distillation column; esterifying in said distillation column said mixture of aliphatic alcohol with said carboxylic acid at a molar ratio of from 1.1:1 to 2.0:1 acid to alcohol in the presence of an acid catalyst to form water and a mixture of esters containing ethyl ester and heavier esters; continuously separating the ethyl ester so formed in the distillation column from said mixture of esters; continuously withdrawing the water and ethyl ester formed through the upper portion of said distillation column; and continuously withdrawing the heavier esters formed through the sump of said distillation column.
Claim 2
Dependent Claim
151 words
A process for the preparation of an ethyl ester from an ethanol containing mixture of aliphatic alcohols, which comprises: feeding a mixture of aliphatic alcohol to distillation column at a point located in the sump portion of said distillation column; feeding carboxylic acid to the distillation column at a point located near the middle of said distillation column; esterifying in said distillation column said mixture of aliphatic alcohol with said carboxylic acid at a molar ratio of from 1.1:1 to 2.0:1 acid to alcohol in the presence of an acid catalyst to form water and a mixture of esters containing ethyl ester and heavier esters; continuously separating the ethyl ester so formed in the distillation column from said mixture of esters; continuously withdrawing the water and ethyl ester formed through the upper portion of said distillation column; and continuously withdrawing the heavier esters formed through the sump of said distillation column.
Claim 3
Dependent Claim
24 words
The process of claim 1 wherein said acid catalyst is H 2 SO 4 or an ion exchanger resin containing SO 3 H groups.
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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) | 1987-11-06 | 1988-05-07 | 1988-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-06 | 1992-05-07 | 1992-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-06 | 1996-05-07 | 1996-11-06 | $7700.00 | Window Closed / Lapsed |