Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

A glass dynamic recirculating still was employed for the measurement of isothermal (vapour + liquid) equilibrium (VLE) data for the binary mixtures of diisopropyl ether (DIPE) + alcohol, viz. (DIPE + methanol), (DIPE + ethanol), and (DIPE + 1-butanol) at T = (305.15, 315.15, and 325.15) K, T = (313.15, 323.15, and 333.15) K and T = (318.15, and 338.15) K, respectively. The combined standard uncertainties in the reported system pressures, temperatures and phase compositions are +-0.2 kPa, +-0.1 K and +-0.003, respectively. Maximum pressure azeotropes were observed for all isotherms of the (DIPE + methanol) and (DIPE + ethanol) systems. The experimental results were correlated using both the c / and / / approaches. For the correlation of the VLE data with the c / approach, the Wilson, NRTL and UNIQUAC G E models with the truncated two-term virial equation of state (Hayden and O Connell correlation for second virial coef?cient computation) were used. In the/ /correlation approach, the Peng Robinson equation of state was used with the Wong Sander mixing rules incorporating the same G E models used in the c / approach. Comparisons between the experimental values and predictions using UNIFAC (Dortmund) and the Predictive Soave Redlich Kwong (PSRK) model were performed to test the predictive capabilities of these models for the experimental data measured here. The thermodynamic consistency of the experimental data was checked with the Herington area test.