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  4. Ionic liquids for the selective solvent extraction of lithium from aqueous solutions: a theoretical selection using COSMO-RS
 
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Ionic liquids for the selective solvent extraction of lithium from aqueous solutions: a theoretical selection using COSMO-RS
Olea, Felipe
Durán, Guillermo
Díaz, Georgina
Villarroel, Eduardo
Araya López, Claudio
Dr. Cabezas-Cornejo, René 
Facultad de Ciencias 
Merlet, Gastón
Romero, Julio
Quijada Maldonado, Esteban
10.3390/min12020190
Minerals
2022
In this study, the theoretical design of ionic liquids (ILs) for predicting selective extraction of lithium from brines has been conducted using COSMO-RS. A theoretical model for the solvent extraction (SX) of the metal species present in brines was established considering extraction stoichiometry, the distribution of the extractants between aqueous and IL phases, and IL dissociation in the aqueous phase. Theoretical results were validated using experimental extraction percentages from previous works. Results indicate that, in general, the theoretical results for lithium extraction follow experimental trends, except from magnesium extraction. Finally, based on the model, an IL was proposed that was based on the phosphonium cation as the extractant, along with the phase modifier tributylphosphate (TBP) in an organic diluent in order to improve selectivity for lithium ex- traction over sodium. These results provide an insight for the application of ILs in lithium processing, avoiding the long purification times reported in the conventional process.
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minerals-12-00190-v3 (1).pdf

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Solvent extraction
Ionic liquids
Lithium
Selectivity
Ciencias de la tierra y medioambientales
Ingeniería ambiental
Historial de mejoras
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