Abstract
The thermodynamic parameters at infinite dilution for twenty-six organic solutes in 1-allyl-3-vinylimidazolium bis((trifluorompropyl)sulfonyl)imide ([AVIM][NTf2]) ionic liquid were determined by the inverse gas chromatography (IGC). The parameters encompassed the Flory-Huggins interaction parameter (γ12∞), the activity coefficient at infinite dilution (γ12∞), the thermodynamic functions (ΔH1E,∞,ΔS1E,∞) and the Hildebrand solubility parameter (δ2) in the temperature range of 313.15 K − 343.15 K. The values of selectivity and capacity for four separation problems as heptane (1)/benzene (2), cyclohexane (1)/benzene(2), benzene(1)/ methanol(2) , hexane(1) /1-hexene(2) were calculated from γ12∞ and compared to literature values for bis((trifluorompropyl)sulfonyl)imide-based ionic liquids (ILs) for the same separation problems. The Hansen solubility parameter (δT) and its partial solubility parameters (δd, δp, δh) were also determined based on the method proposed by Voelkel and Janas. It was found that for tested solutes, the value of χ12∞was less than 4 and γ12∞value was less than 25 except for the n-alkanes. The five types of solubility parameters showed a linear decrease trend with the increase of temperature and the solubility parameters at room temperature were obtained as δ2 = 23.27, δT = 23.21, δd = 22.78, δp = 3.366, δh = 2.486 (MPa)1/2 by the extrapolation.
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