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Regeneration of anion exchange resins by catalyzed electrochemical reduction

Patent ·
OSTI ID:874288
 [1];  [2]
  1. Oak Ridge, TN
  2. Knoxville, TN
+ Show Author Affiliations
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.
Research Organization:
LOCKHEED MARTIN ENERGY RES COR
DOE Contract Number:
AC05-96OR22464
Assignee:
U. T. Battelle, LLC (Oak Ridge, TN)
Patent Number(s):
US 6358396
OSTI ID:
874288
Country of Publication:
United States
Language:
English

References (2)

Perchlorate Chemistry: Implications for Analysis and Remediation journal September 1998
Oxygen-Transfer Reactions of Methylrhenium Oxides journal January 1996

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Related Subjects

/205/210/
accelerate
added
agent
agents
alcohol
anion
anion exchange
bed
catalyzed
cell
chemical
chemical reduction
chloride
combination
complexing
complexing agent
continuously
electrochemical
electrochemical cell
ethyl
exchange
exchange resin
generation
including
kinetics
metals
minimized
oxalate
oxidized
perchlorate
performed
precipitation
prevent
reagents
recycling
reducing
reducing agent
reduction
regenerated
regenerating
regeneration
resin
resins
secondary
solution
sorbed
species
tiiv
transitional
waste