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Ionic liquids (ILs) are non-molecular solvents that have recently gained considerable attention as a new class of designer solvents [2-4]. These compounds are salts with melting points below room temperature [3] and are composed of bulky and asymmetric organic cations with various anions. The anions are usually inorganic but can also be organic [5], and they are primarily responsible for the miscibility of ILs with water [4]. Among the main features of ILs are a low vapor pressure, high thermal [2-4] and oxidative [4] stability, and unique catalytic properties [2]. Because of their low volatility, the ILs are considered “green solvents” with respect both to the safety of the operator and to the environment [4, 6]. This characteristic makes the ILs a potentially attractive replacement for volatile organic compounds as the solvent in various chemical processes. Another important advantage of ILs is the ability to adjust their physicochemical properties by the choice of the cation and anion, providing a wide range of potential solvents [5, 3]; this last feature makes these compounds extremely interesting for extraction processes.