Study of vapor-liquid equilibrium for binary mixtures (chloroform plus 2,2,2-trifluoroethanol) and (α,α,α-trifluorotoluene plus 2,2,2-trifluoroethanol) at pressure 102 kPa

Vapor-liquid equilibria (VLE) of binary mixtures of (chloroform + 2,2,2-trifluoroethanol) and (alpha,alpha,alpha-trifluorotoluene + 2,2,2-trifluoroethanol) were determined at the pressure 102 kPa using the dynamic ebulliometry method. The measured activity coefficients of the equilibrium mixtures satisfied the thermodynamic consistency area test of Redlich-Kister to <= 3 % and were adequately correlated by means of NRTL and UNIQUAC thermodynamic models. The two systems are low-boiling azeotropes, with maximum excess Gibbs energies of 1238 J.mol(-1) for the former and 1226 J.mol(-1) for the latter. The azeotrope formation is attributed to different types of hydrogen bonding dominating the mixtures.