Patent US3131221A successfully refreshed from Google Patents.
US3131221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation and purification of fatty acid amines
Assignee: Pure Oil Co
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Filing: 1958-12-30
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Granted: 1964-04-28
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Expires: 1978-12-30
Abstract
No abstract record available.
Inventors
- 👤 Nathaniel L Remes
- 👤 Thomas W Martinek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:10
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/62; C07C209/82; C07C209/84; C07C209/86; C07C211/00; C07C211/01; C07C211/02; C07C211/03; C07C211/08; C07C211/26; C07C211/27; C07C213/00; C07C213/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
200 words
THE METHOD OF SEPARATING MIXTURES OF ALIPHATIC UNSUBSTITUTED MONO AMINES AND AT LEAST ONE PRIMARY AMINE, AT LEAST ONE SECONDARY AMINE AND AT LEAST ONE TERTIARY AMINE, SAID PRIMARY AND SECONDARY AMINES DIFFERING FROM EACH OTHER BY MORE THAN ONE CARBON ATOM AND THE ALIPHATIC RADICALS OF SAID AMINES CONTAINING FROM 1I TO 32 CARBON ATOMS WHICH COMPRISES, REACTING SAID MIXTURE WITH CARBON DIOXIDE IN THE PRESENCE OF A NON-POLAR HYDROCARBON SOLVENT AT AMBIENT TEMPERATURE TO A TEMPERATURE NO GREATER THAN ABOUT 100*F. BUT BELOW THE DECOMPOSITION TEMPERATURE OF THE CARBAMATE DERIVATIVES OF SAID PRIMARY AND SECONDARY AMINES AND AT A PRESSURE UP TO ABOUT 50 P.S.I.G. TO CONVERT SAID PRIMARY AND SECONDARY AMINES TO THE CORRESPONDING ALKYLAMMONIUM CARBAMATES IN SOLID FORM, SEPARAING THE ALKYLAMMONIUM CARBAMATES FROM SAID REACTION MIXTURE, SUBJECTING SAID ALKYLAMMONIUM CARBAMATE MIXTURE TO FRACTIONAL CRYSTALLIZATION IN THE PRESENCE OF A POLAR SOLVENT OF THE GROUP CONSISTING OF METHANOL, ETHANOL, PROPANOL, ETHYLETHER, METHYLETHYL KETONE AND FORMALDEHYDE TO FORM SEPARATE SOLID FRACTIONS CONSISTING OF THE ALKYLAMMONIUM CARBAMATES OF THE SAID PRIMARY AMINES AND THE ALKYLAMMONIUM CARBAMATES OF SAID SECONDARY AMINES AND CONVERTING SAID SEPARATE FRACTIONS TO THE ORIGINAL PRIMARY AND SECONDARYEPARATE FRACTIONS TO THE ORIGINAL PRIMARY AND SECONDARY AMINES.
Claim 2
Independent Claim
200 words
THE METHOD OF SEPARATING MIXTURES OF ALIPHATIC UNSUBSTITUTED MONO AMINES AND AT LEAST ONE PRIMARY AMINE, AT LEAST ONE SECONDARY AMINE AND AT LEAST ONE TERTIARY AMINE, SAID PRIMARY AND SECONDARY AMINES DIFFERING FROM EACH OTHER BY MORE THAN ONE CARBON ATOM AND THE ALIPHATIC RADICALS OF SAID AMINES CONTAINING FROM 1I TO 32 CARBON ATOMS WHICH COMPRISES, REACTING SAID MIXTURE WITH CARBON DIOXIDE IN THE PRESENCE OF A NON-POLAR HYDROCARBON SOLVENT AT AMBIENT TEMPERATURE TO A TEMPERATURE NO GREATER THAN ABOUT 100*F. BUT BELOW THE DECOMPOSITION TEMPERATURE OF THE CARBAMATE DERIVATIVES OF SAID PRIMARY AND SECONDARY AMINES AND AT A PRESSURE UP TO ABOUT 50 P.S.I.G. TO CONVERT SAID PRIMARY AND SECONDARY AMINES TO THE CORRESPONDING ALKYLAMMONIUM CARBAMATES IN SOLID FORM, SEPARAING THE ALKYLAMMONIUM CARBAMATES FROM SAID REACTION MIXTURE, SUBJECTING SAID ALKYLAMMONIUM CARBAMATE MIXTURE TO FRACTIONAL CRYSTALLIZATION IN THE PRESENCE OF A POLAR SOLVENT OF THE GROUP CONSISTING OF METHANOL, ETHANOL, PROPANOL, ETHYLETHER, METHYLETHYL KETONE AND FORMALDEHYDE TO FORM SEPARATE SOLID FRACTIONS CONSISTING OF THE ALKYLAMMONIUM CARBAMATES OF THE SAID PRIMARY AMINES AND THE ALKYLAMMONIUM CARBAMATES OF SAID SECONDARY AMINES AND CONVERTING SAID SEPARATE FRACTIONS TO THE ORIGINAL PRIMARY AND SECONDARYEPARATE FRACTIONS TO THE ORIGINAL PRIMARY AND SECONDARY AMINES.
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) | 1967-04-28 | 1967-10-28 | 1968-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-28 | 1971-10-28 | 1972-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-28 | 1975-10-28 | 1976-04-28 | $7700.00 | Window Closed / Lapsed |