US4437994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extraction of metal ions from aqueous solution
Assignee: United States Department of the Interior
•
Filing: 1980-08-14
•
Granted: 1984-03-20
•
Expires: 2000-08-14
Abstract
Abstract A process of extraction of ions of metals from an aqueous feed solution and liberation of such in an aqueous product solution wherein the feed solution is circulated through the lumens of hollow fibers, the walls of said fibers consisting of a microporous membrane having the pores filled with an organic liquid comprising a complexing agent, and the ions travel through said walls to be liberated in an aqueous product solution circulated over the outside of the fibers. A preferred embodiment of the process employs an anisotropic microporous membrane having pores of about 0.01 to 0.04 micron in diameter at each surface and larger pores in the interior.
Inventors
- 👤 Richard W. Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:55
CPC Classifications
C; C22; C22B; C22B60/00; C22B60/02; C22B60/0204; C22B60/0217; C22B60/0252; C22B60/0265; B; B01; B01D; B01D61/00; B01D61/38; C01; C01G; C01G3/00; C01G3/003; C22B3/00; C22B3/20; C22B3/22; C22B3/24; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
156 words
A process for extraction of selected ions of metals from an aqueous feed solution and deposition of said ions in an aqueous product solution comprising: circulating said feed solution into the lumens of a multiplicity of hollow fibers, the walls of said fibers consisting essentially of a microporous anisotropic membrane having pores of about 0.01 to 0.04 micron in diameter at each surface and pores of about 2 to 10 microns in diameter in the interior, and said membrane having a water-immiscible organic liquid comprising a complexing agent specific for said ions substantially completely filling, and retained within, the pores thereof, and circulating said aqueous product solution over the outer sides of said fibers, whereby a complex is formed between said complexing agent and said ions in the feed solution followed by diffusion of said complex through the organic liquid in the pores of the membrane, and subsequent liberation of said ions in the product solution.
Claim 2
Dependent Claim
156 words
A process for extraction of selected ions of metals from an aqueous feed solution and deposition of said ions in an aqueous product solution comprising: circulating said feed solution into the lumens of a multiplicity of hollow fibers, the walls of said fibers consisting essentially of a microporous anisotropic membrane having pores of about 0.01 to 0.04 micron in diameter at each surface and pores of about 2 to 10 microns in diameter in the interior, and said membrane having a water-immiscible organic liquid comprising a complexing agent specific for said ions substantially completely filling, and retained within, the pores thereof, and circulating said aqueous product solution over the outer sides of said fibers, whereby a complex is formed between said complexing agent and said ions in the feed solution followed by diffusion of said complex through the organic liquid in the pores of the membrane, and subsequent liberation of said ions in the product solution.
Claim 3
Dependent Claim
14 words
The process of claim 1 in which said anisotropic membrane consists essentially of polysulfone.
Claim 4
Dependent Claim
19 words
The process of claim 1 in which the hollow fibers have internal diameters no greater than about 50 mils.
Claim 5
Dependent Claim
20 words
The process of claim 1 in which the hollow fibers have walls of a thickness of 10 mils or less.
Claim 6
Dependent Claim
13 words
The process of claim 1 in which the selected ions are metallic cations.
Claim 7
Dependent Claim
12 words
The process of claim 5 in which the cations are copper ions.
Claim 8
Dependent Claim
13 words
The process of claim 1 in which the selected ions are metallic anions.
Claim 9
Dependent Claim
13 words
The process of claim 7 in which the anions are uranyl sulfate ions.
Claim 10
Dependent Claim
17 words
The process of claim 1 in which the water-immiscible organic liquid consists essentially of said complexing agent.
Claim 11
Dependent Claim
23 words
The process of claim 1 in which the water-immiscible organic liquid comprises a solution of said complexing agent in an organic liquid carrier.
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) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |