Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1997-09-02
2000-05-09
Zitomer, Fred
Liquid purification or separation
Processes
Ion exchange or selective sorption
210682, 521 27, 521 30, 521 32, 521 34, 525381, C02F 142
Patent
active
060599758
ABSTRACT:
Disclosed herein are a class of anion exchange resins containing two different exchange sites with improved selectivity and sorptive capability for chemical species in solution, such as heptavalent technetium (as pertechnetate anion, TcO.sub.4.sup.-). The resins are prepared by first reacting haloalkylated crosslinked copolymer beads with a large tertiary amine in a solvent in which the resin beads can swell, followed by reaction with a second, smaller, tertiary amine to more fully complete the functionalization of the resin. The resins have enhanced selectivity, capacity, and exchange kinetics.
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Alexandratos Spiro D.
Bonnesen Peter V.
Brown Gilbert M.
Moyer Bruce A.
Lockheed Martin Energy Research Corporation
Zitomer Fred
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