Measurements of Infinite Dilution Activity Coefficients of Alkanols in the Ionic Liquid Tributylmethylammonium Methyl Sulfate Using HS-SPME/GC/FID

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• 作者：Andrew Milli Elias ; Gerson Luiz Vieira Coelho
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2016
• 出版时间：May 12, 2016
• 年：2016
• 卷：61
• 期：5
• 页码：1743-1748
• 全文大小：296K
• 年卷期：0
• ISSN：1520-5134

文摘

The activity coefficients at infinite dilution (γ_stack">i^stack">∞) and gas–liquid partition coefficients (K_LG) for six solutes (methanol, ethanol, 1-propanol, 1-butanol, 2-butanol, and 2-methyl-2-propanol) in the liquid ionic (IL) tributylmethylammonium methyl sulfate ([TBMA][CH₃SO₄]) were determined by HS-SPME (headspace-solid phase micro extraction) at four temperatures from 338.15 to 368.15 K. The values of partial molar excess enthalpies at infinite dilution (ΔH_stack">i^stack">E,∞), Gibbs free energies (ΔG_stack">i^stack">E,∞), and entropies (ΔS_stack">i^stack">E,∞) were also calculated from the γ_stack">i^stack">∞ values. The results are unprecedented in the literature and suggest that SPME can be used to determine activity coefficients at infinite dilution of solutes in liquid ionic solvents.