Patent US3159632A successfully refreshed from Google Patents.
US3159632A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Repetitive process for the removal and/or recovery of amines from aqueous solutions
Assignee: Dow Chemical Co
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Filing: 1960-11-25
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Granted: 1964-12-01
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Expires: 1980-11-25
Abstract
No abstract record available.
Inventors
- 👤 Roger N Sargent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:52
CPC Classifications
B; B01; B01J; B01J41/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A METHOD FOR REMOVING AN ORGANIC AMINE AS FREE BASE FROM AN AQUEOUS SOLUTION THEREOF HAVING A PH AT LEAST 9 BY CONTACTING SAID SOLUTION WITH A WATER-WET ANION EXCHANGE RESIN HAVING AN ION EXCHANGE CAPACITY OF AT LEAST 0.5 MILLIEQUIVALENT PER GRAM OF DRY RESIN AND AN ION EXCHANGE CAPACITY OF 5 TO 80 PERCENT THAT OF A CONVENTIONAL FULL CAPACITY RESIN WHEREBY SAID AMINE IS MOLECULARLY SORBED ON SAID RESIN AND REMOVING SAID SORBED AMINE FROM SAID RESIN AS A SALT BY REACTION ON THE RESIN WITH AN EXCESS OF MINERAL ACID UP TO ABOUT 10% OVER THAT REQUIRED TO FORM THE AMINE SALT, AND ELUTING SAID AMINE SALT WITH WATER.
Claim 2
Independent Claim
113 words
A METHOD FOR REMOVING AN ORGANIC AMINE AS FREE BASE FROM AN AQUEOUS SOLUTION THEREOF HAVING A PH AT LEAST 9 BY CONTACTING SAID SOLUTION WITH A WATER-WET ANION EXCHANGE RESIN HAVING AN ION EXCHANGE CAPACITY OF AT LEAST 0.5 MILLIEQUIVALENT PER GRAM OF DRY RESIN AND AN ION EXCHANGE CAPACITY OF 5 TO 80 PERCENT THAT OF A CONVENTIONAL FULL CAPACITY RESIN WHEREBY SAID AMINE IS MOLECULARLY SORBED ON SAID RESIN AND REMOVING SAID SORBED AMINE FROM SAID RESIN AS A SALT BY REACTION ON THE RESIN WITH AN EXCESS OF MINERAL ACID UP TO ABOUT 10% OVER THAT REQUIRED TO FORM THE AMINE SALT, AND ELUTING SAID AMINE SALT WITH WATER.
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) | 1967-12-01 | 1968-06-01 | 1968-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-01 | 1972-06-01 | 1972-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-01 | 1976-06-01 | 1976-12-01 | $7700.00 | Window Closed / Lapsed |