US4324911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the continuous preparation of diacetyl ethylene diamine
Assignee: Hoechst AG
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Filing: 1980-10-07
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Granted: 1982-04-13
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Expires: 2000-10-07
Abstract
Abstract A process for the continuous preparation of diacetyl ethylene diamine, w hich comprises allowing a mixture of ethylene diamine and acetic acid to react in a low-temperature zone at a temperature of about 80° to 140° C., completing the reaction of the mixture in a subsequent high-temperature zone of from about 140° to 215° C., discharging the diacetyl ethylene diamine obtained at the end of the high-temperature zone and stripping the reaction water in countercurrent flow by an inert gas at a point located between the low-temperature and the high-temperature zone.
Inventors
- 👤 Werner Wellbrock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:44
CPC Classifications
C; C07; C07C; C07C231/00; C07C231/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A process for the continuous preparation of diacetyl ethylene diamine, which comprises allowing a mixture of ethylene diamine and acetic acid to react in a low-temperature zone at a temperature of about 80° to 140° C., completing the reaction of the mixture in a subsequent high-temperature zone of from about 160° to 215° C., discharging the diacetyl ethylene diamine obtained at the end of the high-temperature zone and stripping the reaction water in counter-current flow by an inert gas at a point located between the low-temperature and the high-temperature zone.
Claim 2
Dependent Claim
90 words
A process for the continuous preparation of diacetyl ethylene diamine, which comprises allowing a mixture of ethylene diamine and acetic acid to react in a low-temperature zone at a temperature of about 80° to 140° C., completing the reaction of the mixture in a subsequent high-temperature zone of from about 160° to 215° C., discharging the diacetyl ethylene diamine obtained at the end of the high-temperature zone and stripping the reaction water in counter-current flow by an inert gas at a point located between the low-temperature and the high-temperature zone.
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) | 1985-04-12 | 1985-10-12 | 1986-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-12 | 1989-10-12 | 1990-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-12 | 1993-10-12 | 1994-04-13 | $7700.00 | Window Closed / Lapsed |