Distribution of benzo-substituted crown-ethers between chloroform and water: effects of macrocycle ring size and lithium chloride |
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| Authors: | Olga A Zakurdaeva Andrey F Asachenko Maxim A Topchiy Sergey V Nesterov |
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| Institution: | 1.Enikolopov Institute of Synthetic Polymer Materials of RAS,Moscow,Russia;2.Topchiev Institute of Petrochemical Synthesis of RAS,Moscow,Russia;3.Department of Chemistry,Lomonosov Moscow State University,Moscow,Russia |
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| Abstract: | Small size benzo-substituted crown ethers are attractive complexing agents for lithium isotope separation by solvent extraction. Low transfer of the crown ethers from solvent to water is a key point for applicability of the extractants. In the present study, 9- and 12-membered crown ethers were synthesized, and their distribution between chloroform and water was studied. Polyether ring size, benzene substituents and addition of LiCl to water were found to effect on distribution constants. Low losses of the macrocycles were observed at single-stage contact with aqueous phase. However, these losses should be taken into account in the design of multistage processes for the preparation of highly enriched lithium isotopes. |
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