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US4448694A
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Metal extraction from solution and immobilized chelating agents used therefor
Assignee: Dow Silicones Corp
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Filing: 1981-09-04
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Granted: 1984-05-15
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Expires: 2001-09-04
Abstract
Abstract What is disclosed are novel metal chelating agents which are bonded to inorganic substrates to immobilize them. An example of such a metal chelating agent is (CH3O)3Si(CH2)3NH(CH2CH2NH)2(CH2)3Si(OCH3). An example of an inorganic substrate is a silica gel.
Inventors
- 👤 Edwin P. Plueddemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:37
CPC Classifications
C; C22; C22B; C22B60/00; C22B60/02; C22B60/0204; C22B60/0217; C22B60/0252; C22B60/0265; B; B01; B01J; B01J45/00; C01; C01F; C01F17/00; C01F17/10; C01G; C01G23/00; C01G23/001; C01G3/00; C01G3/003; C01G39/00; C01G39/003; C01G45/00; C01G45/01; C01G49/00; C01G49/0009; C01G51/00; C01G51/01; C01G53/00; C01G53/01; C01G55/00; C01G55/001; C01G56/00; C01G56/001; C01G7/00; C01G7/003; C02; C02F; C02F1/00; C02F1/28; C02F1/288; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/18; C07F7/1804; C22B3/00; C22B3/20; C22B3/42; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
61 words
A method for preparing an immobilized chelating agent which comprises treating an inorganic solid substrate with a silylating agent which is a compound of the formula (RO) 3 SiQNH(CH 2 CH 2 NH) x QSi(OR) 3 where x has a value of 2, 3, or 4, R is a methyl, ethyl, propyl or butyl radical and Q is propylene or butylene.
Claim 2
Independent Claim
61 words
A method for preparing an immobilized chelating agent which comprises treating an inorganic solid substrate with a silylating agent which is a compound of the formula (RO) 3 SiQNH(CH 2 CH 2 NH) x QSi(OR) 3 where x has a value of 2, 3, or 4, R is a methyl, ethyl, propyl or butyl radical and Q is propylene or butylene.
Claim 3
Dependent Claim
9 words
The product produced by the method of claim 1.
Claim 4
Dependent Claim
26 words
A method of removing heavy metal ions from solution which method comprises contacting a solution containing heavy metal ions with a silylated substrate of claim 2.
Claim 5
Dependent Claim
45 words
A method as claimed in claim 3 wherein the solution is aqueous, the substrate is siliceous mineral and the treating compound is (CH 3 O) 3 Si(CH 2 ) 3 NH(CH 2 CH 2 NH) x (CH 2 ) 3 Si(OCH 3 ) 3 .
Claim 6
Dependent Claim
11 words
A method as claimed in claim 4 wherein x is 2.
Claim 7
Dependent Claim
11 words
A method as claimed in claim 4 wherein x is 3.
Claim 8
Dependent Claim
11 words
A method as claimed in claim 4 wherein x is 4.
Claim 9
Dependent Claim
16 words
A method as claimed in claim 3 wherein the heavy metal ions are transition metal ions.
Claim 10
Dependent Claim
14 words
A method as claimed in claim 8 wherein the transition metal ions are lanthanides.
Claim 11
Dependent Claim
14 words
A method as claimed in claim 8 wherein the transition metal ions are actinides.
Claim 12
Dependent Claim
14 words
A method as claimed in claim 8 wherein the transition metal ion is copper.
Claim 13
Dependent Claim
14 words
A method as claimed in claim 8 wherein the transition metal ion is iron.
Claim 14
Dependent Claim
14 words
A method as claimed in claim 8 wherein the transition metal ion is cobalt.
Claim 15
Dependent Claim
14 words
A method as claimed in claim 8 wherein the transition metal ion is nickel.
Claim 16
Dependent Claim
14 words
A method as claimed in claim 8 wherein the transition metal ion is molybdenum.
Claim 17
Dependent Claim
14 words
A method as claimed in claim 8 wherein the transition metal ion is rhodium.
Claim 18
Dependent Claim
14 words
A method as claimed in claim 8 wherein the transition metal ion is silver.
Claim 19
Dependent Claim
14 words
A method as claimed in claim 8 wherein the transition metal ion is platinum.
Claim 20
Dependent Claim
14 words
A method as claimed in claim 8 wherein the transition metal ion is gold.
Claim 21
Dependent Claim
13 words
A method as claimed in claim 8 wherein the transition metal is manganese.
Claim 22
Dependent Claim
13 words
A method as claimed in claim 8 wherein the transition metal is titanium.
Claim 23
Dependent Claim
12 words
A method as claimed in claim 10 wherein the actinide is uranium.
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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) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |