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The effect of chemical and structural factors on the phase behavior of ionic liquids with alcohols is examined, focusing on pyridinium ionic liquids (ILs) for comparison to imidazolium ILs from previous studies. The nonrandom two-liquid (NRTL) equation with binary interaction parameters with linear temperature dependence has provided a good fit of the experimental data for all the systems.

The impact of different characteristics of the ionic liquids (ILs) and the alcohols on the liquid-liquid phase equilibrium of imidazolium-based ionic liquids and alcohols is examined. The ionic liquid-water mutual solubility data for a number of ionic liquids is discussed.

Abstract: Liquid–liquid equilibrium (LLE) phase behavior was investigated for the binary iodine–water (I2–H2O) and the ternary iodine–hydroiodic acid–water (I2–HI–H2O) at the elevated temperatures and pressures of interest for the reactive distillation column of the Sulfur–Iodine Cycle. A continuous-flow apparatus, with wetted parts fabricated from tantalum-tungsten alloys, was designed and constructed for the highly corrosive conditions of this work. A central feature of the apparatus is the equilibrium view cell, which allows for the observation and discernment of vapor-liquid, liquid-liquid, and liquid–liquid–vapor equilibria for HIx systems. For the I2–H2O system, LLE was observed at temperatures and pressures to 300°C and 104 bar. Based on our observations, we estimate that the upper critical solution temperature for this system occurs at 310–315°C. For the I2–HI–H2O ternary, VLE, LLE, and LLVE were all observed at 160 and 200°C, and three compositions on the water-rich side of the LLE phase envelope were determined. [Copyright &y& Elsevier]