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

• Published in: Journal of solution chemistry Vol. 44; no. 3-4; pp. 413 - 430
• Main Authors: Wlazło, Michał, Marciniak, Andrzej, Letcher, Trevor M.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.04.2015
• Subjects: Activity coefficients; Aldehydes; Anions; Cations; Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Dilution; Entropy; Geochemistry; Industrial Chemistry/Chemical Engineering; Inorganic Chemistry; Ionic liquids; Mathematical analysis; Oceanography; Physical Chemistry; 1-Ethyl-3-methylimidazolium trifluorotris(perfluoroethyl)phosphate; Selectivity; LFER; [emim][FAP]; Activity coefficients at infinite dilution; Ionic liquid
• ISSN: 0095-9782; 1572-8927
• DOI: 10.1007/s10953-014-0274-0

New data of activity coefficients at infinite dilution, γ 13 ∞ , for 65 different solutes including alkanes, alkenes, alkynes, cycloalkanes, aromatic hydrocarbons, alcohols, thiophene, ethers, ketones, aldehydes, esters and water in the ionic liquid 1-ethyl-3-methylimidazolium trifluorotris(perfluoroethyl)phosphate, were determined using inverse gas chromatography within the temperature range from 318.15 to 368.15 K. This is a continuation of our study of ionic liquids based on this anion. The results are compared with the other trifluorotris(perfluoroethyl)phosphate ionic liquids. The γ 13 ∞ values were used to calculate thermodynamic functions such as partial molar excess Gibbs energies Δ G 1 E, ∞ , enthalpies Δ H 1 E, ∞ and entropies Δ S 1 E, ∞ as well as gas–liquid partition coefficients of the solutes, K L . These values were used to determine the linear free energy relationship (LFER) system constants as a function of temperature. The selectivities at infinite dilution needed for some extraction problems were calculated and compared with literature data of ionic liquids based on the trifluorotris(perfluoroethyl)phosphate anion and the 1-ethyl-3-methylimidazolium cation. Additionally, the density and viscosity of the investigated ionic liquid at temperatures from 298.15 to 348.15 K were measured.