US3867405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing N-(beta-hydroxyethyl)-2-pyrrolidone
Assignee: Mitsubishi Chemical Corp
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Filing: 1973-02-28
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Granted: 1975-02-18
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Expires: 1993-02-28
Abstract
Abstract In a process for preparing N-( Beta -hydroxyethyl)-2-pyrrolidone by reacting gamma -butyrolactone with monoethanolamine at a temperature of 150*-400*C, the improvement which comprises adding a suitable amount of water to the condensation reaction system.
Inventors
- 👤 Junichi Kanetka
- 👤 Takashi Shimodaira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:04
CPC Classifications
C; C07; C07D; C07D207/00; C07D207/02; C07D207/18; C07D207/22; C07D207/24; C07D207/26; C07D207/263; C07D207/27
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
IN A PROCESS FOR PREPARING N-(B-HYDROXYETHYL)-2PYRROLIDONE BY REACTING Y-BUTYROLACTONE WITH MONOETHANOLAMINE AT A TEMPERATURE OF 150* - 400*C UNDER A PRESSURE WHICH IS AT LEAST THE PRESSURE OF WATER AT THE REACTION TEMPERATURE SELECTED, THE IMPROVEMENT WHICH COMPRISES: ADDING WATER TO THE CONDENSATION REACTION SYSTEM, IN AN AMOUNT OF MORE THAN ABOUT 3 PERCENT BY WEIGHT BASED ON THE TOTAL WEIGHT OF Y-BUTYROLACTONE AND MONETHANOLAMINE.
Claim 2
Dependent Claim
65 words
IN A PROCESS FOR PREPARING N-(B-HYDROXYETHYL)-2PYRROLIDONE BY REACTING Y-BUTYROLACTONE WITH MONOETHANOLAMINE AT A TEMPERATURE OF 150* - 400*C UNDER A PRESSURE WHICH IS AT LEAST THE PRESSURE OF WATER AT THE REACTION TEMPERATURE SELECTED, THE IMPROVEMENT WHICH COMPRISES: ADDING WATER TO THE CONDENSATION REACTION SYSTEM, IN AN AMOUNT OF MORE THAN ABOUT 3 PERCENT BY WEIGHT BASED ON THE TOTAL WEIGHT OF Y-BUTYROLACTONE AND MONETHANOLAMINE.
Claim 3
Dependent Claim
34 words
The process according to claim 1, wherein the amount of water added to the reaction system to the total weight of gamma -butyrolactone and monoethanolamine is in the range of 5-100 percent by weight.
Claim 4
Dependent Claim
21 words
The process according to claim 1, wherein water is added to the condensation reaction system at the initiation of the reaction.
Claim 5
Dependent Claim
22 words
The process according to claim 1, wherein water is added to the condensation reaction system in the initial stages of the reaction.
Claim 6
Dependent Claim
18 words
The process according to claim 1, wherein water is added to the condensation reaction system during the reaction.
Claim 7
Dependent Claim
23 words
The process according to claim 1, wherein an equimolar amount of a 5-10 mole percent excess of gamma -butyrolactone to monoethanolamine is used.
Claim 8
Dependent Claim
16 words
The process according to claim 1, wherein the condensation reaction is performed in a sealed reactor.
References Cited (Backward Citations)
US2669570A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |