US4659512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fixation of dissolved metal species with a complexing agent
Assignee: Individual
•
Filing: 1983-12-21
•
Granted: 1987-04-21
•
Expires: 2003-12-21
Abstract
Abstract A process for removing metal species from solution comprising passing the liquid over a composition comprising a support such as a porous silicate glass or silica gel or charcoal having interconnected pores and containing water soluble amine complexing agents absorbed on the support capable of forming a stable complex with the metal species. The preferred amine complexing agent is triethylenetetramine. The process is especially useful for removing radioactive cobalt from liquid waste streams.
Inventors
- 👤 Pedro B. Macedo
- 👤 Aaron Barkatt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:13
CPC Classifications
C; C03; C03C; C03C1/00; C03C1/002; C02; C02F; C02F1/00; C02F1/28; C02F1/288; C02F1/68; C02F1/683; C03C11/00; C03C11/005; C03C21/00; C03C21/001; C03C23/00; C03C23/0095; C03C3/00; C03C3/04; C03C3/06; C03C3/061; C03C3/076; C03C3/089; G; G21; G21F; G21F9/00; G21F9/04; G21F9/06; G21F9/12; C02F2101/00; C02F2101/006; C03C2201/00; C03C2201/06; C03C2201/08; C03C2201/10; C03C2201/20; C03C2201/30; C03C2201/50
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
155 words
A process for removing metal species of Group IVb through Group IIIa, inclusive, of the Periodic Table from a liquid containing said metal species which comprises treating a porous support having interconnected pores, said porous support being silicate glass or silica gel having an internal surface covered by silicon-bonded hydroxyl groups, with an amine complexing agent capable of forming a stable complex with said metal species whereby the internal surface of said porous support contains said amine complexing agent, said amine complexing agent being a neutral or basic water soluble alkylene amine having 2 to 5 amine groups, said amine complexing agent being present in said porous support in an amount effective to complex the metal species and form a complex between said amine complexing agent and said metal species, and passing said liquid over said porous support in a packed column to form a complex between said amine complexing agent and said metal species.
Claim 2
Dependent Claim
155 words
A process for removing metal species of Group IVb through Group IIIa, inclusive, of the Periodic Table from a liquid containing said metal species which comprises treating a porous support having interconnected pores, said porous support being silicate glass or silica gel having an internal surface covered by silicon-bonded hydroxyl groups, with an amine complexing agent capable of forming a stable complex with said metal species whereby the internal surface of said porous support contains said amine complexing agent, said amine complexing agent being a neutral or basic water soluble alkylene amine having 2 to 5 amine groups, said amine complexing agent being present in said porous support in an amount effective to complex the metal species and form a complex between said amine complexing agent and said metal species, and passing said liquid over said porous support in a packed column to form a complex between said amine complexing agent and said metal species.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein said liquid is a water solution.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein said metal species is cobalt.
Claim 5
Dependent Claim
11 words
The process of claim 3 wherein said cobalt is radioactive cobalt.
Claim 6
Dependent Claim
28 words
The process of claim 1 wherein said amine complexing agent has 2 to 8 carbon atoms, and a carbon atom to amine group ratio of 2:1 or less.
Claim 7
Dependent Claim
14 words
The process of claim 1 wherein said liquid also contains chloride and sulfate ions.
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein said amine complexing agent is triethylenetetramine.
Claim 9
Dependent Claim
24 words
The process of claim 1 wherein the silicon dioxide content of said silicate glass or silica gel is at least about 70 mol percent.
Claim 10
Dependent Claim
24 words
The process of claim 1 wherein the silicon dioxide content of said silicate glass or silica gel is at least about 82 mol percent.
Claim 11
Dependent Claim
24 words
The process of claim 1 wherein the silicon dioxide content of said silicate glass or silica gel is at least about 89 mol percent.
Claim 12
Dependent Claim
15 words
The process of claim 1 wherein said liquid is a cleaning or metallic plating solution.
Claim 13
Dependent Claim
12 words
The process of claim 1 wherein said liquid is a hydrometallurgical solution.
Claim 14
Dependent Claim
13 words
The process of claim 1 wherein said porous support comprises a silicate glass.
Claim 15
Dependent Claim
12 words
The process of claim 1 wherein said amine complexing agent is triethylenetetramine.
Claim 16
Dependent Claim
23 words
The process of claim 1 wherein said charcoal has a specific area in the range of about 500 to 200 m 2 /g.
Claim 17
Dependent Claim
16 words
The process of claim 1 wherein said charcoal is prepared by the destructive distallation of wood.
Claim 18
Dependent Claim
11 words
The process of claim 1 wherein said metal species is cobalt.
Claim 19
Dependent Claim
17 words
The process of claim 1 wherein said amine complexing agent is triethylenetetramine, ethylenediamine, diethylenetriamine, tetraethylenepentamine or triethylenediamine.
Claim 20
Dependent Claim
13 words
The process of claim 1 wherein said metal species is a radioactive species.
Claim 21
Dependent Claim
117 words
A process for removing metal species of Group IVb through Group IIIa, inclusive, of the Periodic Table from a liquid containing said metal species which comprises passing said liquid over a composition in a packed column comprising a porous support having interconnected pores, said porous support being charcoal having an internal surface containing an amine complexing agent capable of forming a stable complex with said metal species, said amine complexing agent being a neutral or basic water soluble alkylene amine having 2 to 5 amine groups, said amine complexing agent being present in an amount effective to complex the metal species and form a complex between the amine complexing agent of said composition and said metal species.
Claim 22
Dependent Claim
117 words
A process for removing metal species of Group IVb through Group IIIa, inclusive, of the Periodic Table from a liquid containing said metal species which comprises passing said liquid over a composition in a packed column comprising a porous support having interconnected pores, said porous support being charcoal having an internal surface containing an amine complexing agent capable of forming a stable complex with said metal species, said amine complexing agent being a neutral or basic water soluble alkylene amine having 2 to 5 amine groups, said amine complexing agent being present in an amount effective to complex the metal species and form a complex between the amine complexing agent of said composition and said metal species.
Claim 23
Dependent Claim
13 words
The process of claim 20 wherein said metal species is a radioactive species.
Claim 24
Dependent Claim
17 words
The process of claim 20 wherein said amine complexing agent is triethylenetetramine, ethylenediamine, diethylenetriamine, tetraethylenepentamine or triethylenediamine.
Claim 25
Dependent Claim
12 words
The process of claim 20 wherein said liquid is a water solution.
Claim 26
Dependent Claim
12 words
The process of claim 20 wherein said metal species is radioactive cobalt.
Claim 27
Dependent Claim
15 words
The process of claim 20 wherein said liquid is a cleaning or metallic plating solution.
Claim 28
Dependent Claim
12 words
The process of claim 20 wherein said liquid is a hydrometallurgical solution.
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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) | 1990-04-20 | 1990-10-20 | 1991-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-20 | 1994-10-20 | 1995-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-20 | 1998-10-20 | 1999-04-21 | $7700.00 | Window Closed / Lapsed |