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The activity coefficient at infinite dilution( i γ ∞ )and distribution ratios at infinite dilution ( i K ∞ ) were determined for alkanols (methanol, ethanol, 1-propanol, 1-butanol, 2-butanol, and 2-methyl-2-propanol) in the ionic liquid (IL) 1-butyl-3-methylimidazolium methyl sulfate ([BMIM][CH3SO4]) by HS-SPME (Headspace Solid Phase Micro Extraction) at four temperatures (298.15, 313.15, 333.15, and 353.15K) using headspace solid phase microextraction (SPME-HS). The results showed significant agreement with literature data. In addition, partial molar excess enthalpies at infinite dilution ( ) , E i H ∞ ∆ , excess Gibbs energies ( ) , E i G ∞ ∆ , and excess entropies ( ) , E i S ∞ ∆ were calculated from the i γ ∞ values.

Measurement of Activity Coefficients at Infinite Dilution for Alcohols in [BMIM][CH3SO4] using HS-SPME/GC-FID