US 12,410,531 B2
Processes for preparing lithium hydroxide
Jean-François Magnan, Neuville (CA); Guy Bourassa, Québec (CA); Gary Pearse, Ottawa (CA); Peter Symons, Williamsville, NY (US); and J. David Genders, Elma, NY (US)
Assigned to NEMASKA LITHIUM INC., Montréal (CA)
Filed by NEMASKA LITHIUM INC., Montréal (CA)
Filed on Jul. 23, 2021, as Appl. No. 17/383,436.
Application 17/383,436 is a continuation of application No. 16/579,173, filed on Sep. 23, 2019, granted, now 11,078,583.
Application 16/579,173 is a continuation of application No. 14/776,922, abandoned, previously published as PCT/CA2014/000264, filed on Mar. 17, 2014.
Claims priority of provisional application 61/788,292, filed on Mar. 15, 2013.
Prior Publication US 2021/0348285 A1, Nov. 11, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. C25B 15/02 (2021.01); B01D 61/44 (2006.01); C25B 1/00 (2021.01); C25B 1/16 (2006.01); C25B 1/22 (2006.01); C25B 9/19 (2021.01); C25B 9/21 (2021.01); C25B 13/02 (2006.01); C25B 13/04 (2021.01); C25B 15/023 (2021.01); C25B 15/027 (2021.01); C25B 15/029 (2021.01); C25B 15/031 (2021.01)
CPC C25B 15/02 (2013.01) [B01D 61/44 (2013.01); B01D 61/445 (2013.01); C25B 1/00 (2013.01); C25B 1/16 (2013.01); C25B 1/22 (2013.01); C25B 9/19 (2021.01); C25B 9/21 (2021.01); C25B 13/02 (2013.01); C25B 13/04 (2013.01); C25B 15/023 (2021.01); C25B 15/027 (2021.01); C25B 15/029 (2021.01); C25B 15/031 (2021.01); Y02E 60/36 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system for preparing lithium hydroxide, said system comprising:
an electrolysis cell, said electrolysis cell defining an anodic compartment separated from a central compartment by an anion exchange membrane and a cathodic compartment separated from said central compartment by a cation exchange membrane, said central compartment comprising at least one inlet for receiving an aqueous composition comprising lithium compound, said cathodic compartment comprising at least one cathode wherein said cathode is configured to produce a lithium hydroxide-enriched aqueous composition, said anodic compartment comprising at least one anode,
wherein said system further comprises a pH probe, and at least one inlet for receiving acid or base, and a pH control device for at least substantially maintaining the pH of said aqueous composition comprising said lithium compound in the central compartment at about 1 to about 4;
wherein said system further comprises an oxidation reduction potential probe for measuring the oxidation reduction potential of the aqueous composition in the central compartment, and at least one gas sparger coupled to the electrolysis cell for maintaining the oxidation reduction potential of the aqueous composition by gas sparging.