title: Volumetric Properties of the {x1[C4mim][MeSO4] + (1 -x1)MeOH} System at Temperatures from (283.15 to 333.15) K and Pressures from (0.1 to 35) MPa.
abstract: Densities of pure 1-butyl-3-methylimidazolium methylsulfate, [C4mim][MeSO4], and its mixtures with methanol have been measured. Measurements were made with an accuracy of ±0.2 kg·m-3, using a vibrating-tube densimeter, over the temperature and pressure ranges (283.15-333.15) K and (0.1-35) MPa, respectively. The experimental densities for the pure ionic liquid and alcohol have been correlated by the Tait equation. The results for the {x1[C4mim][MeSO4] + (1 -x1)MeOH} system have been correlated by a van Laar equation involving parameters that are dependent on temperature and pressure. Excess volumes have been obtained directly from the experimental densities, while isobaric expansivities, isothermal compressibilities, and related excess properties were calculated from the correlation equation. Exceptionally strong pressure and temperature influences on these properties were observed.
authors.affiliation: Physical Chemistry Department, Faculty of Chemistry, Warsaw University of Technology, ul. Noakowskiego 3, 00-664 Warszawa, Poland ; Fire and Chemical Testing Department, Science and Research Centre for Fire Protection, ul. Nadwiślańska 213, 05-420 Józefów, Poland.
authors.forename: Dobrochna
authors.initials: D
authors.lastname: Matkowska
authors.forename: Tadeusz
authors.initials: T
authors.lastname: Hofman
keywords: Density; Excess volume; Ionic liquids; Isobaric expansivity; Isothermal compressibility