Separation of lithium isotopes by crown ether-room temperature ionic liquid-anisole friendly solvent system

This is the first study to explore the separation of lithium isotopes by ultrasound-assisted extraction (USE). • An eco-friendly room temperature ionic liquid was synthesized based on ultrasonic-assisted. • Ultrasonic (US) assisted extraction and separation of lithium isotopes. • Lithium isotope value was improved up to δ 7 Li = –166.74. The solvent extraction separation of lithium isotopes has become of growing interest due to the need for 6 Li and 7 Li isotopes in the nuclear industry. A one-step synthesis of room temperature ionic liquid with low viscosity 1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIm][NTf 2 ]) (with reaction yields of 87.47%) was used by the ultrasonic method. The addition of ionic liquid [EMIm][NTf 2 ] in the system significantly improved the extraction efficiency and separation factor compared to the traditional organic solvent anisole for extraction separation of lithium isotopes. The distribution ratio increased from 0.00145 (with the single stage separation factor of 1.024 ± 0.001) to 0.134 (with the single stage separation factor of 1.034 ± 0.001). Furthermore, a multi-stage extraction process was intended to enhance lithium isotope separation performance. Each stage of stripping can be considered as an extraction separation equilibrium process, in which the strip liquor from the load organic phase is used for separation in the next stage as the “original aqueous solution”. The abundance of 6 Li + gradually improved with an increase in the extraction stages. The relative abundance of 6 Li + increased by 1.492% at the 20-stage extraction separation (from 7.53% to 9.022%). This new and simple approach (stripping cross-flow multistage method (SCFM)) was to achieve large enrichment of lighter isotopes of lithium ( 6 Li + ) by combined extraction and stripping process. In summary, the present study offers the possibility for the enrichment of 6 Li + during lithium isotope extraction separation.