(352ac) Volumetric Properties of 1-Butyl-3-Methylimidazolium Hydrogen Sulfate Ionic Liquid + Xylose + Water Mixtures at Different Temperatures

Saccharides and their derivatives as the most abundant class of biochemistry are the receptors of biologically active compounds (enzymes, drugs, etc.) and they are great variance of their biological function such as structural, protective, metabolic and recognition [1]. Ionic liquids (ILs) have been attracting extensive attention from the scientific community in general applications as separation, electrolytes, lubricants and additives, solvents, biomass hydrolysis and others. Their unique physicochemical characteristics, such as conductivity, miscibility, solubility, density, viscosity and so forth, there are many possibilities once it depends on its ions, namely their structure and chemical function. Among the big variety of ILs know until now, we report experimental density data of aqueous solutions of 1-butyl-3-methylimidazolium hydrogen sulfate ionic liquid containing xylose, at different temperatures and composition. The molalities of xylose range were from 0.015 to 1.7 mol∙kg^-1 in water and in (0.025; 0.050; 0.075 and 0.1 mol∙kg^-1) aqueous ionic liquid at temperatures of T = (283.15, 288.15, 293.15, 298.15 and 303.15) K. From these experimental results, corresponding apparent molar volumes, apparent molar volumes at infinite dilution and partial molar volumes of transfer have been determined for the transfer of xylose from water to aqueous ionic liquid solutions.

The measurements of density of solutions was realized with an vibrating-tube densimeter by Anton Paar (Model 4500). The results lead to believe that possible hydrophilic-ionic interactions among the hydrophilic groups (-OH, -O-) of the xylose and the ions of ionic liquid can be predominant in the systems containing xylose.

[1] P.K. Banipal, A.K. Chahal, T.S. Banipal, Journal of Chemical Thermodynamics 41 (2009) 452-483.