Liquid–Liquid Phase Equilibrium and Heat Capacity of Binary Mixture 1‑Ethyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)imide + 1‑Propanol

The
measurements of the liquid–liquid coexistence curve
and the heat capacity for binary mixture {1-ethyl-3-methyl­imidazolium
bis­(trifluoromethyl­sulfonyl)­imide ([C2mim]­[NTf2]) + 1-propanol} have been precisely performed. The values
of the critical exponents α and β in the critical region
were obtained and coincided well with the 3D-Ising ones. The complete
scaling theory was applied to well represent the asymmetric behavior
of the diameter of the coexistence curve, indicating an important
role of the heat capacity related term in the complete scaling formulizm.
A comparison of the reduced critical parameters to those predicted
by the restricted primitive model clearly showed the solvophobic criticality
of the studied system.