Abstract
In this work, the mutual solubilities of sets of ionic liquids ([CnMIM] [TF2N] (n = 4, 8, 12), [C4PY] [TF2N], [C8MIM] [OTF]) and organic compounds (heptane, o-xylene, toluene, or water) are investigated. The experimental data measured for these systems were used to adjust the binary interaction parameters between their components for the Non-Random Two Liquid (NRTL) model. The results showed that the solubility increased with temperature, with high hygroscopicity (10-1 in terms of mole fraction) of the ILs, low interactions with aliphatic hydrocarbons, high interactions with aromatic hydrocarbons and the presence of a lower critical solution temperature (LCST). In addition, this study is the first to show that [C12MIM] [TF2N] is completely soluble in toluene and ortho-xylene between 273.15 and 373.15 K at 1 bar. The average deviations related to the mole fraction between the experimental and calculated values by the NRTL were less than 2.4%.
Highlights
Ionic liquids (ILs) are defined as ionic compounds with a melting point of less than 100 °C
New data have been acquired for the mutual solubility of water, heptane, toluene, o-xylene and a series of ionic liquids at atmospheric pressure
Knowledge regarding the impacts on the liquid phase structure of the salt with the model oil is useful for the formation of new "designer solvents" that are less aggressive to the environment and useful for extracting aromatic hydrocarbons and aromatic/aliphatic mixtures
Summary
Ionic liquids (ILs) are defined as ionic compounds with a melting point of less than 100 °C. The particular physicochemical characteristics of ILs, such as their high solvation abilities and coordination properties, low flammability, wide liquid range, wide electrochemical window, high thermal stability, and negligible vapor pressures, make them suitable candidates for a large range of applications (Earle et al, 2006; Plechkova et al, 2008). The possibility of controlling their properties by adequately manipulating the cations and/or anions allows for the design of these solvents to exhibit selective solubilities for particular components in the fluid mixtures. These characteristics allow ILs to serve as excellent alternative solvents for extraction purposes and as potential green solvents for industrial purposes (Bösmann et al, 2001). It is well known that ILs reduce air pollution risks due to their negligible vapor pressures, their release into aquatic environments could result
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