US4119580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming agglomerated ion exchange resin
Assignee: Dionex Corp
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Filing: 1977-11-07
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Granted: 1978-10-10
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Expires: 1997-11-07
Abstract
Abstract A method for forming agglomerated ion exchange particles in which finely divided synthetic resin coating particles are affixed to the surface of synthetic resin substrate particles. The surface of the coating particles have ion exchange sites with monovalent counterions (e.g., negatively charged) which are attracted to the ion exchange sites on the substrate particles. Multivalent ions (e.g., carbonate) of the same charge as such monovalent counterions are mixed into an aqueous disperson of the coating particles to displace the monovalent counterions thereby increasing the electrostatic charge density of the coating particles. Then, a slurry of the synthetic resin substrate particles is added dropwise to this dispersion which is mixed to form agglomerates by electrostatic attraction.
Inventors
- 👤 Frank C. Smith, Jr.
- 👤 Richard C. Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:35
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/016
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
122 words
A method for forming a plurality of agglomerated ion exchange particles comprising the steps of (a) mixing soluble multivalent ions into an aqueous dispersion of finely divided coating particles formed of insoluble synthetic resin and having ion exchange sites with monovalent counterions on their surfaces, said multivalent ions being of the same charge as said monovalent counterions, to displace the monovalent counterions on said ion exchange sites with the multivalent ions and (b) directing a stream of synthetic resin substrate particles, having ion exchange sites which attract said coating particles ion exchange sites, into a volume of said aqueous dispersion and agitating the mixture to form agglomerates comprising a uniform layer of coating particles affixed to the surface of said substrate particles.
Claim 2
Independent Claim
122 words
A method for forming a plurality of agglomerated ion exchange particles comprising the steps of (a) mixing soluble multivalent ions into an aqueous dispersion of finely divided coating particles formed of insoluble synthetic resin and having ion exchange sites with monovalent counterions on their surfaces, said multivalent ions being of the same charge as said monovalent counterions, to displace the monovalent counterions on said ion exchange sites with the multivalent ions and (b) directing a stream of synthetic resin substrate particles, having ion exchange sites which attract said coating particles ion exchange sites, into a volume of said aqueous dispersion and agitating the mixture to form agglomerates comprising a uniform layer of coating particles affixed to the surface of said substrate particles.
Claim 3
Dependent Claim
31 words
The method of claim 1 in which said monovalent counterions are negatively charged and said multivalent ions are selected from the group consisting of carbonate ion, phosphate ion, and mixtures thereof.
Claim 4
Dependent Claim
13 words
The method of claim 2 in which said multivalent ions comprise carbonate ions.
Claim 5
Dependent Claim
18 words
The method of claim 1 in which said multivalent ions are in stoichiometric excess of said monovalent counterions.
Claim 6
Dependent Claim
12 words
An aqueous dispersion of agglomerates formed by the process of claim 1.
Claim 7
Independent Claim
148 words
A method for forming a packed column containing a bed of ion exchange particles suitable for performing an ion exchange separation comprising (a) mixing soluble multivalent ions in a mixing vessel with an aqueous dispersion of finely divided coating particles formed of insoluble synthetic resin and having ion exchange sites with monovalent counterions on their surfaces, said multivalent ions being of the same charge as said monovalent counterions, to displace the monovalent counterions on said ion exchange sites with the multivalent ions, (b) directing a stream of synthetic resin substrate particles, having ion exchange sites which attract said coating particles ion exchange sites into said aqueous dispersion and agitating the mixture to form a slurry of agglomerates comprising a uniform layer of coating particles affixed to the surface of said substrate particles, and (c) passing said agglomerate slurry from said mixing vessel into an ion exchange separation column.
Claim 8
Independent Claim
148 words
A method for forming a packed column containing a bed of ion exchange particles suitable for performing an ion exchange separation comprising (a) mixing soluble multivalent ions in a mixing vessel with an aqueous dispersion of finely divided coating particles formed of insoluble synthetic resin and having ion exchange sites with monovalent counterions on their surfaces, said multivalent ions being of the same charge as said monovalent counterions, to displace the monovalent counterions on said ion exchange sites with the multivalent ions, (b) directing a stream of synthetic resin substrate particles, having ion exchange sites which attract said coating particles ion exchange sites into said aqueous dispersion and agitating the mixture to form a slurry of agglomerates comprising a uniform layer of coating particles affixed to the surface of said substrate particles, and (c) passing said agglomerate slurry from said mixing vessel into an ion exchange separation column.
Claim 9
Dependent Claim
26 words
The method of claim 6 in which said agglomerates are settled in step (b) and excess liquid is removed from said slurry prior to step (c).
Claim 10
Dependent Claim
13 words
The method of claim 6 in which step (c) is performed under pressure.
Claim 11
Dependent Claim
31 words
The method of claim 6 in which said monovalent counterions are negatively charged and said multivalent ions are selected from the group consisting of carbonate ion, phosphate ion, and mixtures thereof.
Claim 12
Dependent Claim
13 words
The method of claim 6 in which said multivalent ions comprise carbonate ions.
References Cited (Backward Citations)
GB1407116A
Cited
DE2446375A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-09 | 1982-04-10 | 1982-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-09 | 1986-04-10 | 1986-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-09 | 1990-04-10 | 1990-10-10 | $7700.00 | Window Closed / Lapsed |