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Electrolyte chemistry control in electrodialysis processing

United States Patent

December 26, 2017
View the Complete Patent at the US Patent & Trademark Office
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.
Hayes; Thomas D. (Schaumburg, IL), Severin; Blaine F. (Okemos, MI)
Gas Technology Institute (Des Plaines, IL)
14/ 616,262
February 6, 2015
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with government support under grant DE-AC26-07NT42677 awarded by the Department of Energy (DOE). The government has certain rights in the invention.