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Title: Electrolyte chemistry and improved stack performance in high brine concentration electrodialysis

Abstract

Methods for improving ion flux and energy efficiency in a membrane stack of an electrodialysis unit wherein the membrane stack is disposed between an anode and a cathode each in an electrolyte of a selected concentration. Methods include increasing the concentration of the electrolyte, adding a strong base to the electrolyte and adding buffering anions to the electrolyte. Methods for cleaning the electrodes of such a unit involving involve applying a pulsed polarity reversal to the electrodes. Also provided are methods for improving unit operation by increasing the basicity of the electrolyte to the anode and increasing the acidity of the electrolyte to the cathode or alternatively or in addition, by applying heat to increase the operating temperature of at least one of the electrolyte and the treated water stream.

Inventors:
;
Issue Date:
Research Org.:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1576361
Patent Number(s):
10391456
Application Number:
14/616,227
Assignee:
Gas Technology Institute (Des Plaines, IL)
Patent Classifications (CPCs):
B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01D - SEPARATION
DOE Contract Number:  
AC26-07NT42677
Resource Type:
Patent
Resource Relation:
Patent File Date: 2015 Feb 06
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Hayes, Thomas D., and Severin, Blaine F. Electrolyte chemistry and improved stack performance in high brine concentration electrodialysis. United States: N. p., 2019. Web.
Hayes, Thomas D., & Severin, Blaine F. Electrolyte chemistry and improved stack performance in high brine concentration electrodialysis. United States.
Hayes, Thomas D., and Severin, Blaine F. Tue . "Electrolyte chemistry and improved stack performance in high brine concentration electrodialysis". United States. https://www.osti.gov/servlets/purl/1576361.
@article{osti_1576361,
title = {Electrolyte chemistry and improved stack performance in high brine concentration electrodialysis},
author = {Hayes, Thomas D. and Severin, Blaine F.},
abstractNote = {Methods for improving ion flux and energy efficiency in a membrane stack of an electrodialysis unit wherein the membrane stack is disposed between an anode and a cathode each in an electrolyte of a selected concentration. Methods include increasing the concentration of the electrolyte, adding a strong base to the electrolyte and adding buffering anions to the electrolyte. Methods for cleaning the electrodes of such a unit involving involve applying a pulsed polarity reversal to the electrodes. Also provided are methods for improving unit operation by increasing the basicity of the electrolyte to the anode and increasing the acidity of the electrolyte to the cathode or alternatively or in addition, by applying heat to increase the operating temperature of at least one of the electrolyte and the treated water stream.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {8}
}

Patent:

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