US4886598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid membrane coated ion-exchange column solids
Assignee: United States Department of Energy
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Filing: 1988-03-07
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Granted: 1989-12-12
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Expires: 2008-03-07
Abstract
Abstract This invention relates to a method for improving the performance of liquidembrane separations by coating a liquid membrane onto solid ion-exchange resin beads in a fixed bed. Ion-exchange beads fabricated from an ion-exchange resin are swelled with water and are coated with a liquid membrane material that forms a film over the beads. The beads constitute a fixed bed ion-exchange column. Fluid being treated that contains the desired ion to be trapped by the ion-exchange particle is passed through the column. A carrier molecule, contained in the liquid membrane ion-exchange material, is selected for the desired ion in the fluid. The carrier molecule forms a complex with the desired ion, transporting it through the membrane and thus separating it from the other ions. The solution is fed continuously until breakthrough occurs at which time the ion is recovered, and the bed is regenerated.
Inventors
- 👤 Dale P. Barkey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:17
CPC Classifications
C; C22; C22B; C22B3/00; C22B3/20; C22B3/42; B; B01; B01D; B01D11/00; B01D11/04; B01D11/0415; B01D61/00; B01D61/38; B01J; B01J39/00; B01J39/04; B01J39/05; B01J47/00; B01J47/016; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
74 words
An ion exchange composition useful for separation of metal cations in an aqueous solution comprising: a plurality of cation exchange resin beads capable of being confined in close proximity to each other; and, a liquid membrane removably formed on said beads, the liquid membrane being permeable to metal cations in an aqueous solution, the liquid membrane including a carrier compound having a specificity for the cation sufficient to complex the cations in the membrane.
Claim 2
Dependent Claim
74 words
An ion exchange composition useful for separation of metal cations in an aqueous solution comprising: a plurality of cation exchange resin beads capable of being confined in close proximity to each other; and, a liquid membrane removably formed on said beads, the liquid membrane being permeable to metal cations in an aqueous solution, the liquid membrane including a carrier compound having a specificity for the cation sufficient to complex the cations in the membrane.
Claim 3
Dependent Claim
20 words
The ion exchange composition as in claim 1 wherein the liquid membrane further includes a hydrophobic solvent and a surfactant.
Claim 4
Dependent Claim
32 words
The ion exchange composition as in claim 2 wherein the carrier compound is present in an amount from about 10 wt. % to about 60 wt. % with respect to the solvent.
Claim 5
Dependent Claim
26 words
The ion exchange composition as in claim 3 wherein the liquid membrane is permeable to ions of copper and the carrier compound has the structure ##STR4##
Claim 6
Dependent Claim
31 words
The ion exchange composition as in claim 2 wherein the surfactant is present in an amount from about 1 wt. % to about 6 wt. % with respect to the solvent.
Claim 7
Dependent Claim
27 words
The ion exchange composition as in claim 1 wherein the liquid membrane is permeable to ions of copper, chromium, zinc, lead, nickel, cobalt, tungsten, palladium or mercury.
Claim 8
Dependent Claim
66 words
An ion exchange column having a plurality of cation exchange resin beads packed within the column and in close proximity to each other, a liquid membrane being removably formed on said beads, the liquid membrane being permeable to heavy metal cations in an aqueous solution, the liquid membrane including a carrier compound having a specificity for the cations sufficient to complex the cations in the membrane.
Claim 9
Dependent Claim
66 words
An ion exchange column having a plurality of cation exchange resin beads packed within the column and in close proximity to each other, a liquid membrane being removably formed on said beads, the liquid membrane being permeable to heavy metal cations in an aqueous solution, the liquid membrane including a carrier compound having a specificity for the cations sufficient to complex the cations in the membrane.
References Cited (Backward Citations)
US3779907A
Cited
US4048064A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-11 | 1993-06-12 | 1993-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-11 | 1997-06-12 | 1997-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-11 | 2001-06-12 | 2001-12-12 | $7700.00 | Window Closed / Lapsed |