Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1992-05-04
1993-01-26
Schofer, Joseph L.
Liquid purification or separation
Processes
Ion exchange or selective sorption
210681, 423 23, 423 24, 423 63, 423138, 423139, 423DIG14, 521 25, 521 28, 521 29, 521 30, B01D 1504, C02F 128, C02F 262, C08F 2606
Patent
active
051820269
ABSTRACT:
Disclosed are novel ion-exchange and chelate-exchange resins having improved exchange kinetics for separating chemical species from liquids. The resins are prepared from copolymer beads consisting of a monovinyl aromatic monomer and a cross-linking monomer. The copolymer beads are functionalized such that weak-base exchange moieties are substituted at haloalkylated sites which are most accessible to diffusion into the beads, while hydrophilic, strong-base exchange moieties are substituted at haloalkylated sites which are least accessible to diffusion. The resins have improved exchange kinetics due to shortened diffusion path lengths for the chemical species being separated and improved diffusion into the resin beads due to the hydrophilic, strong-base exchange moieties.
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Schofer Joseph L.
The Dow Chemical Company
Wood John L.
Zitomer Fred
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