| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 215115 | The Journal of Chemical Thermodynamics | 2016 | 8 Pages |
•Activity coefficients at infinite dilution measured in the ionic liquid [EMIM]+[OS]−.•29 Organic solutes and water investigated at T = (318.15, 333.15, 348.15 and 358.15) K using GLC.•Selectivities for selected separations compared to other IL’s and solvents.•The expression and estimation of uncertainty have been described in detail.
The present work focussed on screening of the environmental friendly imidazolium-based 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, γ13∞, for 29 organic solutes (alkanes, cycloalkanes, alkenes, alkynes, aromatics, alkanols and ketones) and water in ionic liquid 1-ethyl-3-methylimidazolium n-octylsulphate [EMIM]+[OS]− were measured at temperatures of (318.15, 333.15, 348.15 and 358.15) K. Stationary phase loadings of (23.77 and 40.76)% by mass were used to ensure repeatability of measurements. Uncertainties were determined using the law of propagation of uncertainty with an average absolute deviation of 2.53%. Density, viscosity and refractive index values were measured to confirm the purity of pure ionic liquid. Partial molar excess enthalpies at infinite dilution, ΔH1E,∞, were also determined. The selectivities, Sij∞, and capacities, kj∞, were determined for the separations of (alkane/aromatic), (alkane/alk-1-ene), (cycloalkane/aromatic) and (water/alkan-1-ol). The separating ability of the investigated ionic liquid was compared against previously investigated and industrial solvents such as sulfolane, n-methyl-2-pyrrolidine (NMP) and n-formylmorpholine (NFM).
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