Solvent extraction of lithium ions using benzoyltrifluoroacetone in new solvents

This work studies the solvent extraction of lithium ions from alkaline aqueous solutions by chelating agent 3-benzoyl-1,1,1-trifluoroacetone (HBTA). To develop a more eco-friendly system for than currently used, various hydrophobic room-temperature ionic liquids were investigated as diluents. The influence several experimental parameters on was examined, including phase pH, nature counter-ion, extractant concentration, addition electrically neutral co-extractant. It found that contrary to traditional systems with molecular diluents, HBTA alone dissolved in 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide liquid extracts efficiently solution. co-extractant, tri(n-octyl)phosphine oxide (TOPO) did not result synergetic effect. confirm mechanism (IL), measurements IL constituent and deprotonated concentrations equilibrium carried out. Analysis results suggests an lithium-HBTA complex is extracted into phase. combining 1-hexyl-3-methylimidazolium has high selectivity over sodium but poor calcium. We have shown also stripping ratio can be obtained using relatively concentrated hydrochloric acid. Finally, it use some deep eutectic solvents diluents much less efficient compared ILs.