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Title: Bifunctional anion-exchange resins with improved selectivity and exchange kinetics

Patent ·
OSTI ID:872989
 [1];  [1];  [1];  [2]
  1. Knoxville, TN
  2. Oak Ridge, TN
+ Show Author Affiliations

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
DOE Contract Number:
AC05-96OR22464
Assignee:
Lockheed Martin Energy Research Corporation (Oak Ridge, TN)
Patent Number(s):
US 6059975
OSTI ID:
872989
Country of Publication:
United States
Language:
English

References (5)

SORPTION BEHAVIOR OF PERTECHNETATE ON REILLEX(tm)-HPQ ANION EXCHANGE RESIN FROM NITRIC ACID SOLUTION journal March 1994
Technetium-99 Removal from Process Solutions and Contaminated Groundwater journal January 1993
Adsorption of Pertechnetate on an Anion Exchange Resin journal January 1993
Breakthrough volumes of TcO 4 − on Reillex™-HPQ anion exchange resin in a Hanford Double Shell Tank simulant journal July 1995
Effect of functional group structure on the selectivity of low-capacity anion exchangers for monovalent anions journal January 1984

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bifunctional
anion-exchange
resins
improved
selectivity
exchange
kinetics
disclosed
anion
containing
sites
sorptive
capability
chemical
species
solution
heptavalent
technetium
pertechnetate
tco
prepared
reacting
haloalkylated
crosslinked
copolymer
beads
tertiary
amine
solvent
resin
swell
followed
reaction
complete
functionalization
enhanced
capacity
polymer beads
resin beads
anion exchange
exchange resin
chemical species
exchange resins
chemical specie
ion-exchange resin
improved selectivity
tertiary amine
exchange sites
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