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

Add time:07/20/2019    Source:sciencedirect.com

New values of activity coefficients at infinite dilution, γ∞ for 65 different solutes including alkanes, alkenes, alkynes, cycloalkanes, aromatic hydrocarbons, alcohols, thiophene, ethers, ketones, aldehydes, esters and water in the ionic liquid ethyl-dimethyl-(2-methoxyethyl)ammonium trifluorotris(perfluoroethyl)phosphate, were determined using inverse gas chromatography within the temperature range from (318.15 to 368.15) K. This is a continuation our study of ionic liquids based on this anion and 2-hydroxyethyl cation substituent. The experimental γ∞ values were used to calculate thermodynamics functions such as partial molar excess Gibbs energy ΔG1E,∞, enthalpy ΔH1E,∞ and entropy ΔS1E,∞. Additionally the (gas + liquid) partition coefficients of the solutes, KL were calculated and were used to determine the linear Gibbs energy relationship (LFER) system constants as a function of temperature. Values of the selectivity and capacity at infinite dilution for alkanes/thiophene extraction problems were also calculated. Results were compared to ionic liquids investigated previously with the same anion.

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