Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

The phase behavior of binary liquid mixtures of the ionic liquids (ILs) 1,3-dimethylimidazolium bis((trifluoromethyl) sulfonyl) amide (C1mimNTf2) and 1-methyl-3- propyl imidazolium bis ((trifluoromethyl) sulfonyl) amide (C3mimNTf2) with n-alkyl alcohols (CnOH; 3 = n = 8) was investigated. The phase diagrams are obtained by applying the cloud-point method on a set of synthetically prepared samples. Partial miscibility with an upper critical solution temperature (UCST) was observed. The study focuses on the determination of the liquid liquid phase behavior in a temperature range of (267 423) K at atmospheric pressure. UCSTs were observed in between 280 K and 415 K. The results are complementing prior measurements on similar IL-CnOH systems concerning ILs with longer side chain. A numerical analysis of the phase diagrams on the basis of Ising criticality was applied presuming the validity of the rectilinear diameter or a nonlinear diameter as requested by the theory of complete scaling. The results (UCST, critical composition, width, and diameter) of the coexistence curves are compared with prior discussed results for higher CxmimNTf2 systems.