Ion exchange resins

Ion exchange resin particles bearing ion exchange groups only in the most accessible portions of the particles possess kinetic advantages over fully functionalized resins in continuous-flow treatment of fluids. Resin beads are functionalized in an outer region that is from 32 to 73% of the bead radi...

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Bibliographische Detailangaben
Hauptverfasser:	FRIES, WILLIAM, NAPLES, JOHN OTTO
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOSITIONS BASED THEREON MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL THEIR PREPARATION OR CHEMICAL WORKING-UP THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	Ion exchange resin particles bearing ion exchange groups only in the most accessible portions of the particles possess kinetic advantages over fully functionalized resins in continuous-flow treatment of fluids. Resin beads are functionalized in an outer region that is from 32 to 73% of the bead radius thick: non-spherical or macroporous particles are similarly functionalized in a layer that is adjacent to the outer surface of the particle or to the surface of the macropores. Such a functionalization is obtained using a reagent system in which the functionalization rate is faster than the rate of diffusion of the reagent into the particle, and stopping the reaction when from 68% to 98% of the most readily accessible, functionalizable sites are functionalized.