Determination of Activity Coefficients at Infinite Dilution of 35 Solutes in the Ionic Liquid, 1-Butyl-3-methylimidazolium Tosylate, Using Gas−Liquid Chromatography

Abstract

The activity coefficients at infinite dilution, γ13 ∞, for hydrocarbon solutes, alcohols, water, thiophene, ethers, and ketones in the ionic liquid 1-butyl-3-methylimidazolium tosylate (p-toluenesulfonate), [BMIM][TOS], have been determined by gas−liquid chromatography at temperatures T = (338.15, 348.15, 358.15, and 368.15) K. The selectivity values have been calculated at T = 338.15 K, and the results indicate that the ionic liquid [BMIM][TOS] should be considered as a solvent for separation of aromatic sulfur compounds from alkanes. The partial molar excess enthalpy values at infinite dilution ΔH 1 E∞, determined in this work, together with the values γ13 ∞ have been discussed in terms of intermolecular interactions and compared to results of related systems obtained earlier by us and from the literature.

Solvent nanostructure, the solvophobic effect and amphiphile self-assembly in ionic liquids

“…118,134,136 The enthalpies on addition of alkanes or alcohols increases with increasing carbon chain length and are positive, indicating weak solvent-solute interactions. 118,134,136 The greater interactions for the IL with the alcohols in comparison 135 C 4 MPyrr TCB (1-butyl-1-methylpyrrolidinium tetracyanoborate) 136 and C 4 MPyrr FAP (1-butyl-1-methylpyrrolidinium tris(pentafluoroethyl)trifluorophosphate), 137 BMIm BF 4 , 124 BMIm SCN (BMIm thiocyanate), 125 BMIm TOS (BMIm tosylate) 126 and BMIm NO 3 . 127 This journal is c The Royal Society of Chemistry 2013 Chem.…”

Extractive distillation with ionic liquids: A review

“…and . Figure shows the predicted results of the selectivity and solvent capacity by the UNIFAC model and the experimental data collected from literature at infinite dilution for the separation of n ‐hexane (1) and 1‐hexene (2) with ILs. As a whole, the results predicted by the UNIFAC model and the experimental data agree well, and there is a clear compromise between selectivity and solvent capacity.…”

“…Figure shows the experimental data of the selectivity and capacity at infinite dilution for the ethanol (1)/water (2) separation exhaustively collected from the literature, along with the predicted results by the UNIFAC model. As expected, such structure factors as short alkyl chain length, unbranched group on the IM‐based cation, and no steric shielding effect on the anion are favorable for increasing both the selectivity and solvent capacity.…”

Investigation on Aromaticity Index and Double‐Bond Equivalent of Aromatic Compounds and Ionic Liquids for Fuel Desulphurization

“…DBE has been introduced through organic matters characterization studies and its calculation is a well-established tool in mass spectrometry. In short, DBE can be defined as a summation of the unsaturations plus rings in a molecule which basically can be calculated via a molecular formula, using (5), where and are the number of atom and valence of each atom, respectively [15]:…”

“…Notable characteristics of ionic liquids (ILs) are their nonmeasurable vapour pressure, thermal stability with wide liquid range, and solvating properties for diverse materials. Because of these notable characteristics, ILs have drawn great attention in which their properties are believed to leave minimal impact on the environment as well as human health [3][4][5][6][7][8][9].…”