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US4401629A
Expired / Lapsed
US
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Selective imidazole ion exchange resins
Assignee: NATIONAL INSTITUTE FOR METALLURGY
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Filing: 1981-03-10
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Granted: 1983-08-30
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Expires: 2001-03-10
Abstract
Abstract A polymeric ion exchange resin of the cross-linked type in which the active groups may be constituted either wholly or in part by an imidazole group which is, in turn, attached directly to a cross-linked, polymerized vinyl backbone. The optional substituents on the imidazole ring include optionally substituted pyridyl, imidazolyl or amino groups which can be substantially known type. A method of preparation of such resins includes the provision of at least the imidazole ring on the vinyl monomer before polymerization thereof. The active groups may be added or modified after polymerization with a cross-linking agent.
Inventors
- 👤 Robert D. Hancock
- 👤 Brian R. Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:28
CPC Classifications
B; B01; B01J; B01J39/00; B01J39/08; B01J39/16; B01J39/18; B01J39/20; C; C08; C08F; C08F26/00; C08F26/06; C08F8/00; C08F8/18; C08F8/20; C08F8/28; C08F8/30; C08F8/32
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
126 words
A polymeric ion exchange resin composed essentially of cross-linked recurring units of the following formula: ##STR5## wherein: n is 1, 2 or 3 m is 0, 1 or 2 q is 0 or 1 p is 0 or 1 each R* independently of the others is selected from hydrogen and any substituent which will not affect the ion exchange properties adversely and which will preferably enhance same, and, R 1 and R 2 , independently of each other represent hydrogen, optionally substituted pyridyl, optionally substituted imidazolyl or the group ##STR6## in which R 3 and R 4 independently of each other, is hydrogen, an optionally substituted alkyl radical, or one of the following groups: ##STR7## in which r is an integer of from 1 to 3.
Claim 2
Dependent Claim
126 words
A polymeric ion exchange resin composed essentially of cross-linked recurring units of the following formula: ##STR5## wherein: n is 1, 2 or 3 m is 0, 1 or 2 q is 0 or 1 p is 0 or 1 each R* independently of the others is selected from hydrogen and any substituent which will not affect the ion exchange properties adversely and which will preferably enhance same, and, R 1 and R 2 , independently of each other represent hydrogen, optionally substituted pyridyl, optionally substituted imidazolyl or the group ##STR6## in which R 3 and R 4 independently of each other, is hydrogen, an optionally substituted alkyl radical, or one of the following groups: ##STR7## in which r is an integer of from 1 to 3.
Claim 3
Dependent Claim
25 words
A polymeric ion exchange resin as claimed in claim 1 in which R 1 and R 2 are not both hydrogen at the same time.
Claim 4
Dependent Claim
15 words
A polymeric ion exchange resin as claimed in claim 1 in which R* is hydrogen.
Claim 5
Dependent Claim
29 words
A polymeric ion exchange resin as claimed in claim 1 in which n is 1; m is 0 or 1 and p and q are each 0 or 1.
Claim 6
Dependent Claim
20 words
A polymeric ion exchange resin as claimed in claim 1 in which either R 1 or R 2 is pyridyl.
Claim 7
Dependent Claim
39 words
A polymeric ion exchange resin as claimed in claim 1 in which either R 1 or R 2 is an amino group and R 3 and R 4 are independently selected from the groups hydroxyl ethyl, acetate, and methyl-pyridyl.
Claim 8
Dependent Claim
31 words
A method of producing a polymeric ion exchange resin as claimed in claim 1 in which an imidazole vinyl compound is polymerized together with a cross-linking agent to form said resin.
Claim 9
Dependent Claim
27 words
A method as claimed in claim 7 in which the imidazole vinyl compound has the required active groups attached thereto prior to polymerization of the vinyl compound.
Claim 10
Dependent Claim
22 words
A method as claimed in claim 7 in which active groups are modified or added subsequent to polymerization of the vinyl compound.
Claim 11
Dependent Claim
11 words
A resin prepared by the method as claimed in claim 7.
Claim 12
Dependent Claim
23 words
A polymeric ion exchange resin as claimed in claim 1, 3 or 7 in which the resin itself is cross-linked with divinyl benzene.
Claim 13
Dependent Claim
16 words
A method as claimed in claim 11 in which the resin is cross-linked with divinyl benzene.
Claim 14
Dependent Claim
24 words
A polymer ion exchange resin as claimed in claim 1 having the loading capacity for copper as depicted in curve 2 of FIG. 1.
Claim 15
Dependent Claim
24 words
A polymer ion exchange resin as claimed in claim 1 having the loading capacity for nickel as depicted in curve 5 of FIG. 2.
Claim 16
Dependent Claim
24 words
A polymer ion exchange resin as claimed in claim 1 having the loading capacity for cobalt as depicted in curve 6 of FIG. 3.
Claim 17
Dependent Claim
45 words
A polymer ion exchange resin as claimed in claim 1 characterized in having the loading capacities for copper as depicted in curve 2 of FIG. 1, nickel as depicted in curve 5 of FIG. 2, and cobalt as depicted in curve 6 of FIG. 3.
Claim 18
Independent Claim
173 words
A method of selectively separating copper from nickel from a solution containing copper, nickel and optionally cobalt, comprising the steps of: (1) contacting said solution at a copper absorbing pH with a polymeric ion exchange resin composed essentially of cross-linked recurring units of the following formula: ##STR8## wherein: n is 1, 2 or 3 m is 0, 1 or 2 q is 0 or 1 p is 0 or 1 each R* independently of the others is selected from hydrogen and any substituent which will not affect the ion exchange properties adversely and which will preferably enhance same, and, R 1 and R 2 , independently of each other represent hydrogen, optionally substituted pyridyl, optionally substituted imidazolyl or the group ##STR9## in which R 3 and R 4 independently of each other, is hydrogen, an optionally substituted alkyl radical, or one of the following groups: ##STR10## in which r is an integer of from 1 to 3; and thereafter (2) removing the copper absorbed on said ion exchange resin by lowering the pH.
Claim 19
Independent Claim
173 words
A method of selectively separating copper from nickel from a solution containing copper, nickel and optionally cobalt, comprising the steps of: (1) contacting said solution at a copper absorbing pH with a polymeric ion exchange resin composed essentially of cross-linked recurring units of the following formula: ##STR8## wherein: n is 1, 2 or 3 m is 0, 1 or 2 q is 0 or 1 p is 0 or 1 each R* independently of the others is selected from hydrogen and any substituent which will not affect the ion exchange properties adversely and which will preferably enhance same, and, R 1 and R 2 , independently of each other represent hydrogen, optionally substituted pyridyl, optionally substituted imidazolyl or the group ##STR9## in which R 3 and R 4 independently of each other, is hydrogen, an optionally substituted alkyl radical, or one of the following groups: ##STR10## in which r is an integer of from 1 to 3; and thereafter (2) removing the copper absorbed on said ion exchange resin by lowering the pH.
Claim 20
Independent Claim
167 words
A method of selectively separating nickel from cobalt from a solution containing nickel and cobalt ions, comprising the steps of (1) contacting said solution at a nickel-absorbing pH with a polymeric ion exchange resin composed essentially of cross-linked recurring units of the following formula: ##STR11## wherein: n is 1, 2 or 3 m is 0, 1 or 2 q is 0 or 1 p is 0 or 1 each R* independently of the others is selected from hydrogen and any substituent which will not affect the ion exchange properties adversely and which will preferably enhance same, and, R 1 and R 2 , independently of each other represent hydrogen, optionally substituted pyridyl, optionally substituted imidazolyl or the group ##STR12## in which R 3 and R 4 independently of each other, is hydrogen, an optionally substituted alkyl radical, or one of the following groups: ##STR13## in which r is an integer of from 1 to 3; and thereafter (2) removing the nickel absorbed thereon by lowering the pH.
Claim 21
Independent Claim
167 words
A method of selectively separating nickel from cobalt from a solution containing nickel and cobalt ions, comprising the steps of (1) contacting said solution at a nickel-absorbing pH with a polymeric ion exchange resin composed essentially of cross-linked recurring units of the following formula: ##STR11## wherein: n is 1, 2 or 3 m is 0, 1 or 2 q is 0 or 1 p is 0 or 1 each R* independently of the others is selected from hydrogen and any substituent which will not affect the ion exchange properties adversely and which will preferably enhance same, and, R 1 and R 2 , independently of each other represent hydrogen, optionally substituted pyridyl, optionally substituted imidazolyl or the group ##STR12## in which R 3 and R 4 independently of each other, is hydrogen, an optionally substituted alkyl radical, or one of the following groups: ##STR13## in which r is an integer of from 1 to 3; and thereafter (2) removing the nickel absorbed thereon by lowering the pH.
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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) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |