Experimental studies and thermodynamic modeling on vapor-liquid equilibrium of aqueous solutions containing 1-butyl-1-methylpyrrolidinium trifluoromethanesulfonate ionic liquid, (d+)-Galactose, (d-)-Fructose, (d+)-Lactose and sucrose at 298.15 K

Abstract

Vapor-liquid equilibrium for aqueous solutions of 1-butyl-1-methylpyrrolidinium trifluoromethanesulfonate ([bmpl][otf]) + (d+)-galactose, [bmpl][otf] + (d-)-fructose, [bmpl][otf] + (d+)-lactose and [bmpl][otf] + sucrose was investigates at 298.15 K. For this purpose, water activity in these systems was measured using an improved isopiestic method at T = 298.15 K. Osmotic coefficient of ionic liquid and vapor pressure of solutions were calculated from measured water activity data. NRTL, NRF-NRTL, mNRTL, Wilson and TNRF-mNRTL local composition based models were used to correlate the water activity data for binary and ternary aqueous solutions containing ionic liquid and saccharides considered in this work. All of these models predicted satisfactorily water activity data for the systems investigated. Water activity data and vapor pressure decreasing were utilized to highlight the solute-solvent interactions.