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US3755447A
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Polyalkylene polyamine separation and purification
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1971-11-26
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Granted: 1973-08-28
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Expires: 1991-11-26
Abstract
Abstract THIS INVENTION RELATES TO A PROCESS FOR THE SEPARATION AND PURIFICATION OF POLYALKYLENE POLYAMINES SUCH AS OCCUR IN COMMERCIAL MIXTURES VIA THE SELECTIVE FORMATION OF A COMPLEX BETWEEN A POLYAMINE AND AN INORGANIC SALT WHEREIN THE METAL PORTION OF SAID SALT IS A METAL SELECTED FROM THE GROUP CONSISTING OF LITHIUM, SODIUM, POTASSIUM, MAGNESIUM, CALCIUM, STRONTIUM AND BARIUM. THIS PROCESS HAS THE ADVANTAGE OF OPERATING WITH VERY HIGH SELECTIVITIES IN THE ABSENCE OF LARGE AMOUNTS OF WATER AND IT PERMITS RECOVERY OF THE PURE AMINES WITH NO PRIOR MODIFICATION BY METHYLATION.
Inventors
- 👤 L Klemann
- 👤 T Whitney
- 👤 A Langer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:45
CPC Classifications
C; C07; C07D; C07D231/00; C07D231/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |