US2681332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of amines by urea complex formation
Assignee: ExxonMobil Oil Corp
•
Filing: 1949-09-13
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Granted: 1954-06-15
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Expires: 1969-09-13
Abstract
No abstract record available.
Inventors
- 👤 Gorin Everett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:39
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/152; C07C209/00; C07C209/62; C07C209/82; C07C209/86; C07C211/00; C07C211/01; C07C211/02; C07C211/03; C07C211/26; C07C211/27
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
THE METHOD FOR RECOVERING A TERTIARY AMINE FROM A MIXTURE CONTAINING THE SAME AND A SECONDARY ALIPHATIC AMINE IN WHICH THE ALIPHATIC GROUPS ARE STRAIGHT CHAINS, IN WHICH THE TOTAL NUMBER OF CARBON ATOM IS AT LEAST EIGHT AND WHICH CONSISTS OF THE ELEMENTS CARBON, HYDROGEN AND NITROGEN, WHICH COMPRISES: CONTACTING SAID MIXTURE WITH UREA UNDER CONDITIONS APPROPRIATE FOR THE FORMATION OF A CRYSTALLINE COMPLEX OF UREA AND SAID SECONDARY AMINE, WHEREUPON SAID COMPLEX IS FORMED AND WHEREUPON THE SAID TERTIARY AMINE IS UNAFFECTED BY UREA; SEPARATING THE SAID COMPLEX FROM THE REMAINDER OF THE RESULTING REACTION MIXTURE; AND RECOVERING THE SAID TERTIARY AMINE FROM THE SAID REMAINDER.
Claim 2
Independent Claim
108 words
THE METHOD FOR RECOVERING A TERTIARY AMINE FROM A MIXTURE CONTAINING THE SAME AND A SECONDARY ALIPHATIC AMINE IN WHICH THE ALIPHATIC GROUPS ARE STRAIGHT CHAINS, IN WHICH THE TOTAL NUMBER OF CARBON ATOM IS AT LEAST EIGHT AND WHICH CONSISTS OF THE ELEMENTS CARBON, HYDROGEN AND NITROGEN, WHICH COMPRISES: CONTACTING SAID MIXTURE WITH UREA UNDER CONDITIONS APPROPRIATE FOR THE FORMATION OF A CRYSTALLINE COMPLEX OF UREA AND SAID SECONDARY AMINE, WHEREUPON SAID COMPLEX IS FORMED AND WHEREUPON THE SAID TERTIARY AMINE IS UNAFFECTED BY UREA; SEPARATING THE SAID COMPLEX FROM THE REMAINDER OF THE RESULTING REACTION MIXTURE; AND RECOVERING THE SAID TERTIARY AMINE FROM THE SAID REMAINDER.
References Cited (Backward Citations)
GB443795A
Cited
US2275809A
Cited
US2346632A
Cited
US2376008A
Cited
US2520715A
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US2634261A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-14 | 1957-12-14 | 1958-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-14 | 1961-12-14 | 1962-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-14 | 1965-12-14 | 1966-06-15 | $7700.00 | Window Closed / Lapsed |