Thermophysical properties of 2,5-dimethylfuran and liquid-liquid equilibria of ternary systems water + 2,5-dimethylfuran + alcohols (1-butanol or 2-butanol or 1-hexanol)

摘要

Pure liquid properties, such as density, refractive index and dynamic viscosity of 2,5-dimethylfuran (DMF), a promising biofuel obtained from biomass, were determined over the temperature range (288.2-333.2) K. Liquid-liquid equilibrium (LLE) data of ternary systems water + DMF + alcohols (1-butanol or 2-butanol or 1-hexanol) were experimentally investigated at 298.2 K and 313.2 K at atmospheric pressure, using a jacketed glass equilibrium cell, according to a standard methodology. These alcohols are present in the DMF production process from dehydration of HMF in a biphasic reactor. The obtained results show that these alcohols are good solvents for use in DMF production, since large two-phase regions, great immiscibility and high selectivity for DMF were observed for all systems. The experimental ternary liquid-liquid equilibrium data were correlated using the NRTL and UNIQUAC models for the activity coefficient; the experimental nad calculated LLE data were in excellent agreement, with root mean square deviations below 1% for both NRTL and UNIQUAC models. The reliability of the experimental data was ascertained using the Bachman and Othmer-Tobias equations.