Measurement and correlation of vapor–liquid equilibrium data for binary systems composed of camphene, (+)-3-carene, (-)-β-caryophyllene, p-cymene, and α-pinene at 101.33 kPa

Abstract

Isobaric vapor-liquid equilibrium (VLE) data have been measured in a modified Ellis still for the following binary systems: camphene + p-cymene, camphene + α-pinene, (+)-3-carene + α-pinene, α-pinene + (-)-β-caryophyllene, and camphene + (-)-β-caryophyllene, at 101.33 kPa. The pressure was controlled by a U-shape mercury manometer and a WT3000 intelligent absolute pressure transmitter. The thermodynamic consistency of the VLE experimental data was checked using the Herington area test and Van Ness test. Afterwards, the VLE data were correlated by the nonrandom two-liquid (NRTL), Wilson and universal quasichemical (UNIQUAC) activity coefficient models, with the corresponding binary interaction parameters being regressed. The root mean square deviations of temperature (RMSD(T)) and vapor-phase mole fraction (RMSD(y)) are all less than 0.61 K and 0.0076, respectively. Additionally, the average absolute deviations of temperature (AAD(T)) and vapor-phase mole fraction (AAD(y)) are all less than 0.54 K and 0.0061, respectively. Hence, all of the aforementioned models are deemed to be suitable to calculate the VLE data of the binary systems. In addition, for camphene + (-)-β-caryophyllene system, NRTL shows the best fit. Across all the binary systems studied no azeotropic behavior was observed.