Study of Lithium-Extraction Systems Based on Benzo-15-Crown-5 Ether and Alkylimidazolium-Based Ionic Liquid

Alexey A Bezdomnikov; Liudmila I Demina; Lyudmila G Kuz'mina; Galina V Kostikova; Valeriy I Zhilov; Aslan Yu Tsivadze

doi:10.3390/molecules28030935

Study of Lithium-Extraction Systems Based on Benzo-15-Crown-5 Ether and Alkylimidazolium-Based Ionic Liquid

Molecules. 2023 Jan 17;28(3):935. doi: 10.3390/molecules28030935.

Authors

Alexey A Bezdomnikov¹, Liudmila I Demina¹, Lyudmila G Kuz'mina², Galina V Kostikova¹, Valeriy I Zhilov¹, Aslan Yu Tsivadze¹

Affiliations

¹ Frumkin Institute of Physical Chemistry and Electrochemistry of Russian Academy of Sciences, Leninsky Pr. 31-4, Moscow 119071, Russia.
² Kurnakov Institute of General and Inorganic Chemistry of Russian Academy of Sciences, Leninsky Pr. 31, Moscow 119991, Russia.

Abstract

The extraction of lithium from aqueous solutions of LiNTf₂ and LiCl salts using benzo-15-crown-5 ether (B15C5) as an extractant in [C8mim][NTf₂] ionic liquid was studied. The transition of the extractant into the aqueous phase and the distribution of Cl^- ions during lithium extraction from LiCl solutions were determined. LiNTf₂ complexes with B15C5 with different LiNTf₂:B15C5 ratios were isolated for the first time and characterized via X-ray diffraction and IR spectroscopy. Differences in the extraction process of LiCl and LiNTf₂ were determined via an infrared spectroscopic study of the extraction systems.

Keywords: FTIR spectroscopy; benzo-15-crown-5 ether; complex synthesis; lithium extraction; lithium isotopes.

Grants and funding

075-15-2020-782/Ministry of Science and Higher Education of Russia