Application of 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide ionic liquid for the different types of separations problem: Activity coefficients at infinite dilution measurements using gas-liquid chromatography technique

作者：Singh S; Bahadur I; Naidoo P; Redhi G; Ramjugernath D

来源：Journal of Molecular Liquids, 2016, 220: 33-40.

DOI：10.1016/j.molliq.2016.04.059

• Activity coefficient at infinite dilution
• 1-butyl-3-methylimidazolium
• bis(trifluoromethylsulfonyl)imide
• Gas-liquid chromatography
• Separation
• Selectivity

The present work focussed on application of the environmental friendly 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide ([BMIM](+)[Tf2N](-)) ionic liquid for the separations of (alkane/aromatic), (alkane/alk-1-ene), (cycloalkane/aromatic) and (water/alkan-1-ol) using gas-liquid chromatography (GLC) technique. In this reason the activity coefficients at infinite dilution, gamma(infinity)(13), for 31 organic solutes (alkanes, cycloallcanes, alkenes, alkynes, aromatics, alkanol and ketones) and water in ionic liquid were measured at temperatures of (323.15, 333.15, 343.15, 353.15 and 363.15) K. Stationary phase loadings of (42.83 and 68.66) % by mass were used to ensure repeatability of measurements. Density and viscosity values were measured to confirm the purity of ionic liquid. Partial molar excess enthalpies at infinite dilution, Delta H-1(E,infinity), were also determined. The selectivities, S-ij(infinity), and capacities, k(j)(infinity), were determined for the above separations. The separating ability of the investigated ionic liquid was compared with previously investigated ionic liquids and industrial solvents such as sulfolane, n-methyl-2-pyrrolidine (NMP) and n-formylmorpholine (NFM).

• 出版日期2016-8
• 单位西北大学