US4451375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Iodine adsorption via picolylamine ion exchange resins
Assignee: Dow Chemical Co
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Filing: 1983-08-25
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Granted: 1984-05-29
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Expires: 2003-08-25
Abstract
Abstract Resins bearing picolylamine moieties selectively adsorb iodide ions from acidic aqueous solutions. The iodide can be readily eluted from the resin with base. Particularly useful resins are obtained by reacting chloromethylated styrene-divinylbenzene copolymers with N-(2-hydroxyethyl)-2-picolylamine or bis-(2-picolyl)amine.
Inventors
- 👤 Robert R. Grinstead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:05
CPC Classifications
B; B01; B01J; B01J41/00; B01J41/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
60 words
A method of extracting iodide ions from an aqueous medium comprising: (a) contacting an acidic aqueous medium containing iodide ions with a polymer bearing a plurality of moieties each containing at least one picolylamine group; (b) separating the polymer from the aqueous medium; and (c) contacting the polymer with a base so as to elute iodide adsorbed by the polymer.
Claim 2
Independent Claim
60 words
A method of extracting iodide ions from an aqueous medium comprising: (a) contacting an acidic aqueous medium containing iodide ions with a polymer bearing a plurality of moieties each containing at least one picolylamine group; (b) separating the polymer from the aqueous medium; and (c) contacting the polymer with a base so as to elute iodide adsorbed by the polymer.
Claim 3
Dependent Claim
26 words
The method as described in claim 1 wherein the aqueous medium to be extracted also contains chloride ions and K Cl I is at least 10.
Claim 4
Dependent Claim
18 words
The method as described in claim 2 wherein the polymer contains picolylamine moieties corresponding to the formula ##STR3##
Claim 5
Dependent Claim
18 words
The method as described in claim 2 wherein the polymer contains picolylamine moieties corresponding to the formula ##STR4##
References Cited (Backward Citations)
US2157508A
Cited
US2945746A
Cited
FR1401113A
Cited
US3352641A
Cited
SU339130A1
Cited
US4131645A
Cited
US4031038A
Cited
US4098867A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |