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Title: Electrolyte chemistry control in electrodialysis processing

Patent ·
OSTI ID:1415031

Methods for controlling electrolyte chemistry in electrodialysis units having an anode and a cathode each in an electrolyte of a selected concentration and a membrane stack disposed therebetween. The membrane stack includes pairs of cationic selective and anionic membranes to segregate increasingly dilute salts streams from concentrated salts stream. Electrolyte chemistry control is via use of at least one of following techniques: a single calcium exclusionary cationic selective membrane at a cathode cell boundary, an exclusionary membrane configured as a hydraulically isolated scavenger cell, a multivalent scavenger co-electrolyte and combinations thereof.

Research Organization:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC26-07NT42677
Assignee:
Gas Technology Institute (Des Plaines, IL)
Patent Number(s):
9,849,426
Application Number:
14/616,262
OSTI ID:
1415031
Resource Relation:
Patent File Date: 2015 Feb 06
Country of Publication:
United States
Language:
English

References (6)

Process for salt extraction from hydrogen-sulphide scrubber solution using electrodialysis patent June 1994
Water desalination process and apparatus patent-application March 2006
Aqueous systems at high temperature. Solubility to 200.degree. of calcium sulfate and its hydrates in sea water and saline water concentrates, and temperature-concentration limits journal January 1968
Electrodialysis-based separation technologies: A critical review journal December 2008
Transfer of Monovalent and Divalent Cations in Salt Solutions by Electrodialysis journal March 2007
Transport properties of a commercial cation-exchange membrane in contact with divalent cations or proton-divalent cation solutions during electrodialysis journal November 1996