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Title: Regeneration of anion exchange resins by catalyzed electrochemical reduction

Abstract

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.

Inventors:
 [1];  [2]
  1. Oak Ridge, TN
  2. Knoxville, TN
Issue Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
874288
Patent Number(s):
6358396
Assignee:
U. T. Battelle, LLC (Oak Ridge, TN)
Patent Classifications (CPCs):
C - CHEMISTRY C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE C02F - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01J - CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY
DOE Contract Number:  
AC05-96OR22464
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
regeneration; anion; exchange; resins; catalyzed; electrochemical; reduction; sorbed; perchlorate; regenerated; combination; chemical; chloride; reducing; agent; oxidized; transitional; metals; including; reagents; complexing; agents; oxalate; prevent; precipitation; tiiv; species; ethyl; alcohol; added; accelerate; kinetics; performed; continuously; recycling; regenerating; solution; resin; bed; cell; secondary; waste; generation; minimized; electrochemical cell; exchange resin; reducing agent; anion exchange; complexing agent; chemical reduction; /205/210/

Citation Formats

Gu, Baohua, and Brown, Gilbert M. Regeneration of anion exchange resins by catalyzed electrochemical reduction. United States: N. p., 2002. Web.
Gu, Baohua, & Brown, Gilbert M. Regeneration of anion exchange resins by catalyzed electrochemical reduction. United States.
Gu, Baohua, and Brown, Gilbert M. Tue . "Regeneration of anion exchange resins by catalyzed electrochemical reduction". United States. https://www.osti.gov/servlets/purl/874288.
@article{osti_874288,
title = {Regeneration of anion exchange resins by catalyzed electrochemical reduction},
author = {Gu, Baohua and Brown, Gilbert M},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {1}
}

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Works referenced in this record:

Perchlorate Chemistry: Implications for Analysis and Remediation
journal, September 1998


Oxygen-Transfer Reactions of Methylrhenium Oxides
journal, January 1996