Ternary liquid–liquid equilibria of bis(trifluoromethylsulfonyl)-amide based ionic liquids + 2-propanol + di-iso-propyl ether

• Ternary LLE for [NTf2]− anion based ILs + 2-propanol + DiPE.
• Influence of IL cation structure on S and β is discussed.
• The highest selectivity for separation of 2-propanol/DiPE is observed for [COC2mMOR][NTf2].

Ternary liquid–liquid equilibria for 3 systems containing ionic liquids 4-(2-methoxyethyl)-4-methylmorpholinium bis(trifluoromethylsulfonyl)-amide, 1-(2-methoxyethyl)-1-methylpiperidinium bis(trifluoromethylsulfonyl)-amide, 1-(2-methoxyethyl)-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)-amide) + 2-propanol + di-iso-propyl ether have been determined at T = 298.15 K. The solute distribution coefficient and the selectivity were calculated for all systems. The experimental results have been correlated using NRTL model. The influence of cation structure on selectivity and solute distribution ratio is discussed.