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Density, speed of sound, refractive index, dynamic viscosity, and surface tension measurements of 1-butyl-3methylimidazolium methyl sulfate have been made as a function of temperature. The synthesis of the ionic liquid is given. The low viscosity of the ionic liquid suggests its use as a solvent in the extraction process for the separation of azeotropic mixtures. The thermal expansion coefficient of the ionic liquid was calculated from the density, and the results are discussed. An analysis of the influence of the alkyl chain length of the cation on the density was performed by comparison with recently published values.

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Densities, speeds of sound, and refractive indices of the binary mixtures of BMIM PF 6 (1-butyl-3-methyl imidazolium hexafluorophosphate), HMIM PF 6 (1-hexyl-3-methylimidazolium hexafluorophosphate), OMIM PF 6 (1-methyl-3-octylimidazolium hexafluorophosphate), and MMIM CH 3 SO 4 (1,3-dimethylimidazolium methyl sulfate) with 2-butanone, ethylacetate, and 2-propanol were determined from (293.15 to 303.15) K. Excess molar volumes, changes of refractive index on mixing, and deviations in isentropic compressibility were calculated for the above systems. The liquid-liquid equilibrium data of the binary mixtures ionic liquid + 2-propanol were carried out, and they were compared with the correlated values obtained by means of the NRTL and UNIQUAC equations.

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This paper reports on the synthesis of the ionic liquid 1,3-dimethylimidazolium methyl sulfate [MMIM][MeSO 4 ]. Experimental densities, speed of sounds, and refractive indices were determined from (283.15 to 343.15) K. Dynamic viscosities were measured from (293.15 to 343.15) K. Surface tensions were measured from (288.15 to 313.15) K. The coefficient of thermal expansion and molecular volume of [MMIM][MeSO 4 ] were calculated from experimental values of density.