Phase behaviour and physico-chemical properties of the binary systems {1-ethyl-3-methylimidazolium thiocyanate, or 1-ethyl-3-methylimidazolium tosylate+water, or+an alcohol}

摘要: Abstract Phase diagrams for the binary systems {1-ethyl-3-methylimidazolium thiocyanate, [EMIM][SCN], or 1-ethyl-3-methylimidazolium tosylate [EMIM][TOS] + water, +an alcohol (C7–C10)} have been determined at atmospheric pressure using a dynamic method. Water shows complete miscibility with [EMIM][SCN] in liquid phase temperature range (298.15–438.15) K. (Liquid + liquid) equilibria and (solid + liquid) region were observed involving alcohols [EMIM][TOS]. The reduction of experimental data has carried out Non-Random Two Liquid (NRTL) equation. reported here are compared analogous previously containing, 1-ethyl-3-methylimidazolium-based ionic liquids (ILs). influence anion on behaviour is discussed. Isothermal vapour–liquid equilibrium (VLE) also measured mixtures (IL) {[EMIM][TOS] + ethanol} T = 373.15 K from p = 0 kPa to p = 225 kPa by an ebulliometric For this system negative molar excess Gibbs energy calculated. work presented includes thermophysical characterization IL Furthermore, volumes ( V m E ) {[EMIM][SCN] + water} K ambient pressure. This exhibits positive values. density correlation these was tested empirical second-order polynomial over wide ranges temperatures. described Redlich–Kister expansions dependent parameters. viscosity variations compositions polynomials. volume expansivity α, αE described. A qualitative analysis trend properties water content performed. Our used predict enthalpy mixing H ). Flory–Benson–Treszczanowicz model (FBT) as well did ERAS model. given chosen number parameters Ai, partial 1 2 presented. basic thermal both pure ILs, i.e. glass-transition heat capacity glass transition differential scanning microcalorimetry technique. Decomposition detected simultaneous TG/DTA experiments. surface tension five temperatures