Patent US4014798A successfully refreshed from Google Patents.
US4014798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insoluble polyelectrolyte and ion-exchange hollow fiber impregnated therewith
Assignee: California Institute of Technology
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Filing: 1974-04-04
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Granted: 1977-03-29
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Expires: 1994-04-04
Abstract
Abstract The number of quaternary sites and ion-exchange capacity of a polyquaternary, cross-linked, insoluble copolymer of a vinyl pyridine and a dihalo organic compound is increased by about 15-35% by reaction of the polymer with an amine followed by quaternization, if required. The polymer forms spontaneously in the presence of a substrate such as within the pores of a hollow fiber. The improved resin impregnated fiber may be utilized to remove ions from waste or process streams.
Inventors
- 👤 Alan Rembaum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:33
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/96; B; B01; B01D; B01D69/00; B01D69/08; B01J; B01J47/00; B01J47/018; G01N27/00; G01N27/26; G01N27/416; G01N27/447; G01N27/44704; G01N27/44747
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
205 words
An ion-exchange medium comprising a hollow, annular, thin-walled microporous fiber having particles of polymer embedded and constrained within said pores, said particles being smaller than the diameter of said pores and said polymer comprising polyquaternary, water-insoluble, cross-linked polyer of vinyl pyridine and a dihalo organic compound of the formula: X--R--X where X is halo selected from the group consisting of bromo, chloro and iodo and R 1 is a divalent organic group; said polymer containing a structure of the formula: ##STR4## where R 3 and R 4 are selected from lower alkyl of 1 to 10 carbon atoms, aryl, cycloalkyl of 1 to 10 carbon atoms, lower alkenyl, lower alkoxy or R 3 and R 4 are combined in a single aliphatic divalent group; R 5 is selected from hydrogen, R 3 or -- R 6 --N(R 3 ) 2 where R 6 is a divalent aliphatic or aromatic group of 2-10 carbon atoms and X.sup. - and X' -are selected from chloro , bromo or iodo said X.sup. - and X'.sup. - being ionized halo derived from X--R 1 --X with X.sup. - groups ionized by quaternization with vinyl pyridine and X'.sup. - groups ionized by post polymerization quaternization of said polymer with ##STR5##
Claim 2
Dependent Claim
205 words
An ion-exchange medium comprising a hollow, annular, thin-walled microporous fiber having particles of polymer embedded and constrained within said pores, said particles being smaller than the diameter of said pores and said polymer comprising polyquaternary, water-insoluble, cross-linked polyer of vinyl pyridine and a dihalo organic compound of the formula: X--R--X where X is halo selected from the group consisting of bromo, chloro and iodo and R 1 is a divalent organic group; said polymer containing a structure of the formula: ##STR4## where R 3 and R 4 are selected from lower alkyl of 1 to 10 carbon atoms, aryl, cycloalkyl of 1 to 10 carbon atoms, lower alkenyl, lower alkoxy or R 3 and R 4 are combined in a single aliphatic divalent group; R 5 is selected from hydrogen, R 3 or -- R 6 --N(R 3 ) 2 where R 6 is a divalent aliphatic or aromatic group of 2-10 carbon atoms and X.sup. - and X' -are selected from chloro , bromo or iodo said X.sup. - and X'.sup. - being ionized halo derived from X--R 1 --X with X.sup. - groups ionized by quaternization with vinyl pyridine and X'.sup. - groups ionized by post polymerization quaternization of said polymer with ##STR5##
Claim 3
Dependent Claim
25 words
A medium according to claim 1 in which R 1 contains 1-20 carbon atoms and is selected from alkylene, alkenylene, alkynylene, arylene, alkarylene and aralkylene.
Claim 4
Dependent Claim
16 words
A medium according to claim 1 in which R 1 is selected from ethylene an hexylene.
Claim 5
Dependent Claim
18 words
A medium according to claim 3 in which R 3 , R 4 and R 5 are methyl.
Claim 6
Dependent Claim
18 words
An ion-exchange medium according to claim 1 in which the wall thickness is from 10 to 300 microns.
Claim 7
Dependent Claim
17 words
A medium according to claim 5 in which the internal diameter is from 50 to 1,000 microns.
Claim 8
Dependent Claim
28 words
A medium according to claim 5 in which the pores are evenly distributed throughout the wall of the fiber and have an average diameter less than 1,000 angstroms.
Claim 9
Dependent Claim
17 words
A medium according to claim 1 in which said fiber resin is a fiber grade polyacrylonitrile resin.
Claim 10
Dependent Claim
43 words
A medium according to claim 1 in which the resin particles embedded in said pores do not block said pores to passage of selected ions through the wall to a solution of ions of higher concentration and like charge of the selected ions.
Claim 11
Dependent Claim
29 words
A medium according to claim 1 in which X'.sup. - is 17 to 39% by wieght of the sum of the weights of X.sup. - and X'.sup. - .
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) | 1980-03-28 | 1980-09-27 | 1981-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-28 | 1984-09-27 | 1985-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-28 | 1988-09-27 | 1989-03-29 | $7700.00 | Window Closed / Lapsed |