US4252644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High performance ion exchange composition and the removal and separation of ions therewith
Assignee: Dow Chemical Co
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Filing: 1979-05-25
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Granted: 1981-02-24
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Expires: 1999-05-25
Abstract
Abstract An ion exchange composition comprising an insoluble substrate of a synthetic resin having ion exchanging sites at least on its available surface; and a finely divided, insoluble material comprising synthetic resin particles of from about 0.1 to about 5 microns median diameter (with respect to volume) having, at least on their outer surfaces, ion exchanging sites which attract the ion exchanging sites of the substrate, irreversibly attached as a monolayer to the available surface of the substrate. The composition is used for removal and separatin of ions, and is especially useful in liquid ion exchange chromatography. For example, a chromatographic separation of halide ions is effected with high speed and resolution by contacting an aqueous solution thereof with a bed of the ion exchange composition which consists of surface sulfonated resin beads of a styrene-divinylbenzene copolymer to the surface of which is irreversibly attached a monolayer of quaternary ammonium styrene-divinylbenzene copolymer resin particles in the hydroxy form, and then eluting the bed with an aqueous sodium hydroxide solution.
Inventors
- 👤 Hamish Small
- 👤 Timothy S. Stevesn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:25
CPC Classifications
B; B01; B01D; B01D15/00; B01D15/08; B01D15/26; B01D15/36; B01D15/361; B01J; B01J20/00; B01J20/30; B01J20/32; B01J20/3214; B01J20/3217; B01J20/3221; B01J39/00; B01J39/26; B01J41/00; B01J41/20; B01J47/00; B01J47/016; G; G01; G01N; G01N30/00; G01N30/96; B01J2220/00; B01J2220/50; B01J2220/54
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
170 words
A process for chromatographic separation of ions of like charge comprising: (a) passing a liquid solution comprising the ions through a bed comprising Component A, an insoluble substrate which consists essentially of synthetic resin, having ion-exchanging sites at least on its available surface; and Component B, a finely-divided, insoluble material comprising synthetic resin particles of from about 0.1 micron to about 5 microns median diameter having, at least on their outer surfaces, ion-exchanging sites which attract available sites of Component A, wherein the particles of Component B are irreversibly attached as a monolayer to the available surface of Component A such that a substantial number of particles of Component B will not be displaced from the available surface of Component A by an aqueous sodium hydroxide solution of about 0.5 molar concentration; and which composition has ion-exchanging sites at least on Component B's outer surface that attract at least one of said ions; and (b) eluting the bed with an eluent which differentially removes the attracted ions from the bed.
Claim 2
Dependent Claim
170 words
A process for chromatographic separation of ions of like charge comprising: (a) passing a liquid solution comprising the ions through a bed comprising Component A, an insoluble substrate which consists essentially of synthetic resin, having ion-exchanging sites at least on its available surface; and Component B, a finely-divided, insoluble material comprising synthetic resin particles of from about 0.1 micron to about 5 microns median diameter having, at least on their outer surfaces, ion-exchanging sites which attract available sites of Component A, wherein the particles of Component B are irreversibly attached as a monolayer to the available surface of Component A such that a substantial number of particles of Component B will not be displaced from the available surface of Component A by an aqueous sodium hydroxide solution of about 0.5 molar concentration; and which composition has ion-exchanging sites at least on Component B's outer surface that attract at least one of said ions; and (b) eluting the bed with an eluent which differentially removes the attracted ions from the bed.
Claim 3
Dependent Claim
35 words
The process of claim 1 wherein Component A of the composition comprises finely divided particles of about 5 to about 100 microns particle size which have ion exchanging sites at least on their available surfaces.
Claim 4
Dependent Claim
25 words
The process of claim 2 wherein the particles of Component B have ion exchanging sites substantially throughout the entirety of a majority of the particles.
Claim 5
Dependent Claim
19 words
The process of claim 2 wherein Component A particles are of about 35 to about 75 microns particle size.
Claim 6
Dependent Claim
20 words
The process of claim 4 wherein Component B particles are of from about 0.6 to about 1.8 micron median diameter.
Claim 7
Dependent Claim
32 words
The process of claim 1 wherein the ion exchanging sites of Component A are anion exchanging sites, those of Component B are cation exchanging sites, and the ions separated thereby are cations.
Claim 8
Dependent Claim
34 words
The process of claim 6 wherein the ion exchanging sites of Component B are chelating sites which are attracted to the anion exchanging sites of Component A and the ions separated thereby are cations.
Claim 9
Dependent Claim
32 words
The process of claim 1 wherein the ion exchanging sites of Component A are cation exchanging sites, those of Component B are anion exchanging sites, and the ions separated thereby are anions.
Claim 10
Dependent Claim
31 words
The process of claim 8 wherein Component A comprises finely divided particles of about 35 to about 75 microns particle size whose ion exchanging sites are strong acid cation exchanging sites.
Claim 11
Dependent Claim
19 words
The process of claim 9 wherein the ion exchanging sites of Component B are strong base anion exchanging sites.
Claim 12
Dependent Claim
20 words
The process of claim 10 wherein Component B particles are of from about 0.6 to about 1.8 micron median diameter.
Claim 13
Dependent Claim
12 words
The process of claim 10 wherein Component B particles are latex particles.
Claim 14
Dependent Claim
25 words
The process of claim 1 wherein Component B particles have ion exchanging sites substantially throughout the entirety of a majority of the Component B particles.
Claim 15
Dependent Claim
12 words
The process of claim 1 wherein Component B particles are latex particles.
Claim 16
Dependent Claim
24 words
The process of claim 1 wherein the synthetic resin of Component A and the synthetic resin of Component B both comprise a poly(vinylaromatic) resin.
Claim 17
Dependent Claim
49 words
The process of claim 1 wherein Component A comprises finely divided particles of a sulfonated poly(vinylaromatic) resin, said particles having about 35 microns to about 75 microns particle size and Component B comprises quaternary ammonium poly(vinylaromatic) resin particles of from about 0.6 micron to about 1.8 microns median diameter.
References Cited (Backward Citations)
US3485658A
Cited
US3488922A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |