US3055809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for recovering ethylenediamine from an aqueous ethylenediamine solution
Assignee: Jefferson Chemical Co Inc
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Filing: 1958-10-23
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Granted: 1962-09-25
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Expires: 1978-10-23
Abstract
No abstract record available.
Inventors
- 👤 Lichtenwalter Myrl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:09
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74; C07C29/76; C07C29/80; C07C209/00; C07C209/82; C07C209/84; C07C209/86; C07C211/00; C07C211/01; C07C211/02; C07C211/09; C07C211/10; C07C215/00; C07C215/02; C07C215/04; C07C215/06; C07C215/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A METHOD FOR SEPARATING ETHYLENEDIAMINE FROM A MIXTURE OF ETHYLENEDIAMINE AND WATER WHICH COMPRISES HEATING A MIXTURE OF ETHYLENE DIAMINE AND WATER IN A DISTILLATION ZONE TO FORM A GASEOUS ADMIXTURE OR VAPORS OF SAID ETHYLENEDIAMINE AND WATER IN SAID ZONE, INTRODUCING AN EXTRACTION SOLVENT INTO SAID ZONE INTO CONTACT WITH SAID VAPORS EFFECTIVE TO SELECTIVELY DISSOLVE ETHYLENEDIAME FROM SAID VAPORS OF ETHYLENEDIAMINE AND WATER SAID EXTRACTION SOLVENT BEING SELECTED FROM THE GROUP CONSISTING OF POLYHYDRIC ALCOHOLS, GLYCOL ETHERS AND ALKANOL AMINES BOILING ABOVE ABOVE 120*C., DISTILLING WATER OVERHEAD AND RECOVERING A SUBSTANTIALLY WATER-FREE ETHYLENEDIAMINESOLVENT MIXTURE AS THE BOTTOMS FROM SAID DISTILLATION.
Claim 2
Independent Claim
102 words
A METHOD FOR SEPARATING ETHYLENEDIAMINE FROM A MIXTURE OF ETHYLENEDIAMINE AND WATER WHICH COMPRISES HEATING A MIXTURE OF ETHYLENE DIAMINE AND WATER IN A DISTILLATION ZONE TO FORM A GASEOUS ADMIXTURE OR VAPORS OF SAID ETHYLENEDIAMINE AND WATER IN SAID ZONE, INTRODUCING AN EXTRACTION SOLVENT INTO SAID ZONE INTO CONTACT WITH SAID VAPORS EFFECTIVE TO SELECTIVELY DISSOLVE ETHYLENEDIAME FROM SAID VAPORS OF ETHYLENEDIAMINE AND WATER SAID EXTRACTION SOLVENT BEING SELECTED FROM THE GROUP CONSISTING OF POLYHYDRIC ALCOHOLS, GLYCOL ETHERS AND ALKANOL AMINES BOILING ABOVE ABOVE 120*C., DISTILLING WATER OVERHEAD AND RECOVERING A SUBSTANTIALLY WATER-FREE ETHYLENEDIAMINESOLVENT MIXTURE AS THE BOTTOMS FROM SAID DISTILLATION.
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) | 1965-09-24 | 1966-03-26 | 1966-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-24 | 1970-03-26 | 1970-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-24 | 1974-03-26 | 1974-09-25 | $7700.00 | Window Closed / Lapsed |