Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

This work reports isobaric vapor-liquid equilibrium (VLE) data experimentally determined at (50, 75, and 94) kPa and over the temperature range (334 to 375) K together with atmospheric interfacial tensions (IFT) measured at 298.15 K for the binary system composed by ethanol + cyclopentyl methyl ether. VLE determinations were carried out in a dynamic VLE cell, whereas a maximum differential bubble pressure tensiometer was used for performing IFT measurements. Because few experimental data are available for cyclopentyl methyl ether, vapor pressures and interfacial tensions have also been measured over the temperature range (341 to 378) K and (298 to 353) K, respectively. According to the experimental results, the binary system ethanol + cyclopentyl methyl ether exhibits positive deviation from ideal behavior and azeotropic behavior can be observed over the whole determined pressure range. The concentration of the azeotrope enriches in ethanol as pressure (and/or temperature) increases. The interfacial tension in turn, exhibits positive deviation from the linear behavior. The reported VLE data of the binary mixture are thermodynamically consistent according to Fredenlund's test and were well- correlated by traditional activity coefficients models (such as the Wohl, nonrandom two-liquid, Wilson and the universal quasi-chemical equations) for all of the measured isobars. Finally, the Myers-Scott equation was found to be suitable for correlating the interfacial tensions of the mixture.