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Bifunctional anion-exchange resins with improved selectivity and exchange kinetics

United States Patent

May 9, 2000
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
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.
Alexandratos; Spiro D. (Knoxville, TN), Brown; Gilbert M. (Knoxville, TN), Bonnesen; Peter V. (Knoxville, TN), Moyer; Bruce A. (Oak Ridge, TN)
Lockheed Martin Energy Research Corporation (Oak Ridge, TN)
08/ 922,198
September 2, 1997
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH This invention was made with United States Government support awarded by the Department of Energy to Lockheed Martin Energy Research Corporation, Contract No. DE-AC05-96OR22464. The United States Government has certain rights in this invention.