US4134861A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nitrate selective amidine ion exchange resins
Assignee: DIA-PROSIM Ltd
•
Filing: 1977-07-01
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Granted: 1979-01-16
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Expires: 1997-07-01
Abstract
Abstract Water swellable ion exchange resins comprising a polymeric matrix and amidine groups are described together with their synthesis. The preferred amidine groups are nitrate selective and methods of selectively removing nitrate from water are also described.
Inventors
- 👤 Lubor Roubinek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:13
CPC Classifications
B; B01; B01J; B01J41/00; B01J41/08; B01J41/12; B01J41/14; B01J41/04; B01J41/07; C; C08; C08F; C08F8/00; C08F8/30; C08F8/32; C08F8/44; C08F2810/00; C08F2810/20
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
62 words
A water-swellable, ion exchange resin comprising a cross-linked vinyl polymeric matrix and amidine groups chemically bonded to the matrix and which have the formula ##STR6## where Q represents hydrogen or C 1-4 alkyl and both of R represent C 1-6 alkyl or one R is C 1-6 alkyl and one R is benzyl, which in total provide up to 12 carbon atoms.
Claim 2
Dependent Claim
62 words
A water-swellable, ion exchange resin comprising a cross-linked vinyl polymeric matrix and amidine groups chemically bonded to the matrix and which have the formula ##STR6## where Q represents hydrogen or C 1-4 alkyl and both of R represent C 1-6 alkyl or one R is C 1-6 alkyl and one R is benzyl, which in total provide up to 12 carbon atoms.
Claim 3
Dependent Claim
18 words
A resin according to claim 1 in which the matrix is a vinyl polymer cross-linked with divinyl benzene.
Claim 4
Dependent Claim
27 words
A resin according to claim 1 in which the radicals R are the same or different and represent C 1-6 alkyl and the radical Q represents hydrogen.
Claim 5
Dependent Claim
29 words
A resin according to claim 1 in which the radicals R are the same or different and represent methyl, ethyl, a propyl, or a butyl and Q is hydrogen.
Claim 6
Dependent Claim
26 words
A resin according to claim 1 in which one radical R is selected from methyl, ethyl, propyl and butyl, and one radical R is a butyl.
Claim 7
Dependent Claim
18 words
A resin according to claim 1 in which one radical R is ethyl and the other is butyl.
Claim 8
Dependent Claim
25 words
A resin according to claim 1 in which the total number of carbon atoms in the two groups R and Q is 4 to 9.
Claim 9
Dependent Claim
24 words
A resin according to claim 1 in which the total number of carbon atoms in the groups R and Q is 5 to 7.
Claim 10
Independent Claim
76 words
A method of selectively removing nitrate ion from water comprising contacting the water with a water-swellable ion exchange resin comprising a cross-linked vinyl polymeric matrix and amidine groups chemically bonded to the matrix and which have the formula ##STR7## where Q represents hydrogen or C 1-4 alkyl and both of R represent C 1-6 alkyl or one R is C 1-6 alkyl and one R is benzyl, which in total provide up to 12 carbon atoms.
Claim 11
Independent Claim
76 words
A method of selectively removing nitrate ion from water comprising contacting the water with a water-swellable ion exchange resin comprising a cross-linked vinyl polymeric matrix and amidine groups chemically bonded to the matrix and which have the formula ##STR7## where Q represents hydrogen or C 1-4 alkyl and both of R represent C 1-6 alkyl or one R is C 1-6 alkyl and one R is benzyl, which in total provide up to 12 carbon atoms.
Claim 12
Dependent Claim
24 words
A method according to claim 9 in which the total number of carbon atoms in the groups R and Q is 4 to 9.
Claim 13
Dependent Claim
15 words
A method according to claim 9 in which the said number is 5 to 7.
Claim 14
Dependent Claim
18 words
A method according to claim 9 in which one radical R is ethyl and the other is butyl.
Claim 15
Dependent Claim
42 words
A method of making a resin according to claim 1 comprising reacting crosslinked polyacrylate with a primary amine to form the corresponding polyacrylamide, halogenating this to form the corresponding polyimidoyl halide and reacting this with a primary or secondary amine or ammonia.
Claim 16
Dependent Claim
27 words
A method according to claim 9 in which the radicals R are the same or different and represent C 1-6 alkyl and the radical Q represents hydrogen.
Claim 17
Dependent Claim
29 words
A method according to claim 9 in which the radicals R are the same or different and represent methyl, ethyl, a propyl, or a butyl and Q is hydrogen.
Claim 18
Dependent Claim
26 words
A method according to claim 9 in which one radical R is selected from methyl, ethyl, propyl and butyl, and one radical R is a butyl.
References Cited (Backward Citations)
US3389096A
Cited
US3826787A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-15 | 1982-07-17 | 1983-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-15 | 1986-07-17 | 1987-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-15 | 1990-07-17 | 1991-01-16 | $7700.00 | Window Closed / Lapsed |