US4045352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion-exchange hollow fibers
Assignee: TOPS SYSTEMS Inc
•
Filing: 1975-02-24
•
Granted: 1977-08-30
•
Expires: 1995-02-24
Abstract
Abstract An ion-exchange hollow fiber is prepared by introducing into the wall of the fiber polymerizable liquid monomers, and polymerizing the monomers therein to form solid, insoluble, cross-linked, ion-exchange resin particles which embed in the wall of the fiber. Excess particles blocking the central passage or bore of the fiber are removed by forcing liquid through the fiber. The fibers have high ion-exchange capacity, a practical wall permeability and good mechanical strength even with very thin wall dimensions. Experimental investigation of bundles of ion-exchange hollow fibers attached to a header assembly have shown the fiber to be very efficient in removing counterions from solution.
Inventors
- 👤 Alan Rembaum
- 👤 Shiao-Ping S. Yen
- 👤 Elias Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:22
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/24; B01D61/243; B01D63/00; B01D63/02; B01D69/00; B01D69/08; B01J; B01J47/00; B01J47/018; B01J47/12; B01J47/127; D; D01; D01D; D01D5/00; D01D5/24; H; H01; H01M; H01M8/00; H01M8/10; H01M8/1016; H01M8/1018; H01M8/102; H01M8/1023; H01M8/1058; H01M8/106; H01M8/1062; H01M8/1069; H01M8/1072; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02E60/30; Y02E60/50; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
115 words
An ion-exchange medium comprising a hollow, annular, thin-wall, microporous fiber of a synthetic, organic, thermoplastic resin having pores having an average diameter less than 1000 angstroms which join to form a path across the wall of the fiber and having solid particles of a cross-linked, insoluble ion-exchange resin formed in situ in said pores from ion-exchange reactants of a molecular weight capable of impregnating the pores having a diameter smaller than the pore diameter and having an even distribution of fixed charge embedded and constrained within said pores without blocking said pores of said path such that said medium has a hydraulic permeability of from 1 to 100 × 10 -5 mil/cm 2 sec atm.
Claim 2
Dependent Claim
115 words
An ion-exchange medium comprising a hollow, annular, thin-wall, microporous fiber of a synthetic, organic, thermoplastic resin having pores having an average diameter less than 1000 angstroms which join to form a path across the wall of the fiber and having solid particles of a cross-linked, insoluble ion-exchange resin formed in situ in said pores from ion-exchange reactants of a molecular weight capable of impregnating the pores having a diameter smaller than the pore diameter and having an even distribution of fixed charge embedded and constrained within said pores without blocking said pores of said path such that said medium has a hydraulic permeability of from 1 to 100 × 10 -5 mil/cm 2 sec atm.
Claim 3
Dependent Claim
17 words
A medium according to claim 1 in which the wall thickness is from 10 to 300 microns.
Claim 4
Dependent Claim
17 words
A medium according to claim 2 in which the internal diameter is from 50 to 1,000 microns.
Claim 5
Dependent Claim
19 words
A medium according to claim 2 in which the pores are evenly distributed throughout the wall of the fiber.
Claim 6
Dependent Claim
17 words
A medium according to claim 2 in which said fiber resin is a fiber grade polyacrylonitrile resin.
Claim 7
Dependent Claim
43 words
A medium according to claim 2 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 8
Dependent Claim
19 words
A medium according to claim 1 in which the ion-exchange resin particles contain an even distribution of cationic charge.
Claim 9
Dependent Claim
23 words
A medium according to claim 7 in which the ion-exchange resin is the reaction product of a vinyl pyridine and an organic dihalide.
Claim 10
Dependent Claim
46 words
A medium according to claim 8 in which the vinyl pyridine is 4-vinyl pyridine and the organic dihalide is a compound of the formula: X -- R.sub.1 -- X where X is halo and R 1 is a divalent organic radical containing from 1-20 carbon atoms.
Claim 11
Dependent Claim
30 words
A medium according to claim 9 in which X is chloro or bromo and R 1 is a divalent organic radical selected from alkylene, alkenylene, alkynylene, arylene, alkarylene and aralkylene.
Claim 12
Dependent Claim
13 words
A medium according to claim 10 in which the organic dihalide is 1,2-dibromoethane.
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) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |