Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

(Solid + liquid) equilibria (SLE) and (liquid + liquid) equilibria (LLE) for the binary systems ionic liquid (IL) N-butyl-4-methylpyridinium tosylate (p-toluenesulfonate) [BMPy][TOS] + an alcohol (1-butanol, or 1-hexanol, or 1-octanol, or 1-decanol), or water, or an alkane (hexane, heptane, octane), or benzene, or an alkylbenzene (toluene, ethylbenzene, propylbenzene), or tetrahydrofuran (THF) have been determined at ambient pressure. A dynamic method was used over a broad range of mole fractions and temperatures from (320 to 390) K. In the case of systems (IL + alkane, or alkylbenzene), the mutual immiscibility with an upper critical solution temperature (UCST) was detected. UV spectroscopy was used to determine the very small compositions of the IL in the alkanes, benzene, and alkylbenzenes (about 1 * 10-5 IL mole fraction). For the binary systems containing alcohol and water, simple eutectic diagrams were observed with complete miscibility in the liquid phase. As usual, with increasing chain length of the alcohol, the solubility decreases. The basic thermal properties of the pure IL, i.e., melting and glass-transition temperatures as well as the enthalpy of fusion, have been measured using a differential scanning microcalorimetry technique (DSC). Well-known UNIQUAC, Wilson, and NRTL equations have been used to correlate experimental SLE data sets for alcohols and water. For the systems containing immiscibility gaps (IL + alkane, or benzene, or alkylbenzene, or tetrahydrofuran), parameters of the LLE correlation equations have been derived using only the NRTL equation.