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Regeneration of anion exchange resins by catalyzed electrochemical reduction

United States Patent

March 19, 2002
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
Anion exchange resins sorbed with perchlorate may be regenerated by a combination of chemical reduction of perchlorate to chloride using a reducing agent and an electrochemical reduction of the oxidized reducing agent. Transitional metals including Ti, Re, and V are preferred chemical reagents for the reduction of perchlorate to chloride. Complexing agents such as oxalate are used to prevent the precipitation of the oxidized Ti(IV) species, and ethyl alcohol may be added to accelerate the reduction kinetics of perchlorate. The regeneration may be performed by continuously recycling the regenerating solution through the resin bed and an electrochemical cell so that the secondary waste generation is minimized.
Gu; Baohua (Oak Ridge, TN), Brown; Gilbert M. (Knoxville, TN)
U. T. Battelle, LLC (Oak Ridge, TN)
09/ 566,036
May 8, 2000
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH This invention was made with United States Government support under Contract No. DE-AC05-96OR22464 awarded by the Department of Energy, and the United States Government has certain rights in this invention.