Mixing properties of binary mixtures presenting azeotropes at several temperatures

Surface adsorption and aggregate formation of nonionic surfactants in a room temperature ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate (bmimPF6)

“…The viscosity of bmimPF 6 was measured by the use of a Brookfield Viscometer Model DV-II+ (Stoughton, MA, USA) with cone spindle. The results were g (cP) = 228, 164, and 124 at 25, 30, and 35°C, respectively, which are in a range reported in literature, 207-250 cP (25°C), 153-184 cP (30°C), and 116-141 cP (35°C) [33][34][35][36]. As for the refractive index, we used n = 1.41 which is an average of reported values ranging from 1.407 to 1.410 [35,37,38].…”

Measurement and correlation of (liquid+liquid) equilibrium of the azeotrope (cyclohexane+2-butanone) with different ionic liquids at T=298.15K

“…Excess and derived properties have been calculated from the experimental data. A function of the mole fraction and temperature polynomial equation [20] was used to fit these quantities. The standard deviations between experimental and calculated values are shown.…”

Separation of azeotropic mixtures using protic ionic liquids as extraction solvents

“…The RMSD values are lower than 0.020 for the ternary systems hydrocarbon (1) + ethanol (2) + PIL (3). A comparison between the experimental data and those obtained from the NRTL equation is illustrated in Fig.…”

“…In many areas of industry, the increasing interest related to development of green processes and products makes ionic liquids (ILs) candidates to replace conventional organic solvents in many chemical processes [1]. The possibility of recovering compounds used in industrial processes is not easy, because in many cases the mixtures can form azeotropes [2]. The separation of these azeotropic mixtures into the neat components is needed so that they can be reused, minimizing the costs of industrial processes.…”