Activity coefficients at infinite dilution and physicochemical properties for organic solutes and water in the ionic liquid 1-(2-hydroxyethyl)-3-methylimidazolium trifluorotris(perfluoroethyl)phosphate

Abstract

a b s t r a c t This work presents new data of activity coefficients at infinite dilution, c 1 of different organic solutes and water in the 1-(2-hydroxyethyl)-3-methylimidazolium trifluorotris(perfluoroethyl)phosphate, [C 2 OHmim][FAP] ionic liquid. Values of c 1 were determined for 65 organic solutes, including alkanes, alkenes, alkynes, cycloalkanes, aromatic hydrocarbons, alcohols, thiophene, ethers, ketones, esters, 1-nitropropane, aldehydes, acetonitrile and water by inverse gas chromatography within the temperature range from (318.15 to 368.15) K. The basic thermodynamic functions, such as partial molar excess Gibbs energies, DG E;1 1 , enthalpies, DH E;1 1 and entropies, DS E;1 1 at infinite dilution were calculated from the experimental c 1 values obtained over the temperature range. Additionally the gas-liquid partition coefficients, K L were determined. Experimental values of gas-liquid partition coefficients were used to determine the coefficients in the Abraham solvation parameter model (LFER). Results are compared to previously investigated ionic liquids with the same [C 2 OHmim] + cation and [FAP] À anion. The selectivity and capacity at infinite dilution for alkanes/thiophene extraction problems were calculated from experimental c 1 values to verify the possibility of investigated ionic liquid as an entrainer in liquid-liquid extraction.

Measurements of activity coefficients at infinite dilution of organic solutes and water on polar imidazolium-based ionic liquids

“…The understanding of such interactions can be derived from physico-chemical measurements such as solubilities [7,8], activity coefficients of solutes at infinite dilution ( ∞ 13 γ ) [9][10][11][12], molecular simulation [13,14], spectroscopic techniques [15][16][17], vapor-liquid equilibrium (VLE) data [18,19] and liquid-liquid equilibrium (LLE) data [20,21], as well as from thermodynamic models such as equations of state [22] or from COSMO [19,20].…”

Activity Coefficients at Infinite Dilution and Physicochemical Properties for Organic Solutes and Water in the Ionic Liquid 1-Ethyl-3-methylimidazolium trifluorotris(perfluoroethyl)phosphate

“…Figure 1 shows a comparison of γ 13 ∞ values at 328.15 K obtained in this work for selected solutes and [emim][FAP], together with other ILs based on the [FAP] − anion and imidazolium cation: the IL [hmim][FAP], which differs from the IL investigated in this work with a hexyl group replacing the ethyl group in the cation structure, and [C 2 OHmim][FAP], which has an hydroxyl group in the ethyl side-chain of the cation [ 7 , 22 ]. The full names and the structures of these ILs as well as other ILs used in the comparative studies of selectivities are included in the Online Supplementary Material Table 2S.…”

“…Our work expands the investigation to include other classes of compounds as well as allowing us to compare our values of γ 13 ∞ and S 12 ∞ with those obtained by Yan et al [ 21 ]. Additionally, the γ 13 ∞ of [emim][FAP] were compared with [FAP] − based ILs with other imidazolium cations, namely 1-(2-hydroxyethyl)-3-methylimidazolium [C 2 OHmim] + and 1-hexyl-3-methylimidazolium [hmim] + [ 7 , 22 ]. The selectivities are also compared with those of other [FAP] − ILs [ 3 – 5 , 22 , 23 ].…”

Activity coefficients at infinite dilution, physicochemical and thermodynamic properties for organic solutes and water in the ionic liquid ethyl-dimethyl-(2-methoxyethyl)ammonium trifluorotris-(perfluoroethyl)phosphate

“…Therefore the values of selectivity and capacity for alkanes/thiophene extraction problems were calculated for the IL investigated and compared to other [FAP] À anion based ILs. [22][23][24][25][26].…”