Isothermal vapor−liquid equilibrium (VLE) data for expensive and thermosensitive Litsea cubeba oil systems, citral + linalool, citral + α-pinene, and linalool + α-pinene, were measured at 333.15, 368.15, and 403.15 K using headspace gas chromatography, respectively. The Wilson, nonrandom two-liquid (NRTL), and universal quasi-chemical equation (UNIQUAC) models were employed for VLE data regression, and the results showed a good agreement. The maximum absolute average deviation (AAD) of vapor compositions for all systems at the measured temperatures using the Wilson model, NRTL model, and UNIQUAC model was 0.61, 0.49, and 0.50%, respectively, and the maximum mean relative deviation (MRD) for these three models was −2.83, −2.59, and −2.53%, respectively. In addition, the excess Gibbs energy (G E ) for all systems was calculated using the Wilson model.

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Isobaric vapor–liquid equilibrium (VLE) experimental data for camphene + (±)-limonene, camphene + (+)-3-carene, (±)-limonene + (+)-3-carene, and camphene + (+)-3-carene + (±)-limonene were determined in an improved Ellis still. Furthermore, saturated vapor pressure measurements for camphene across a temperature range of 357.01 to 432.16 K were reported. Additionally, the vapor pressure data, obtained also using an improved Ellis equilibrium still, were fitted by the Antoine equation. The thermodynamic consistency of the VLE values was confirmed by the Herington area and van Ness tests. The VLE data were correlated using the nonrandom two-liquid (NRTL), Wilson, and universal quasichemical (UNIQUAC) activity coefficient models with the measurements demonstrating good correlation. Moreover, the corresponding binary interaction parameters of the three models were regressed. The maximum average absolute deviation of temperature (AAD­(T)) and maximum average absolute deviation of vapor-phase mole fraction (AAD­(y)) are 0.0855 and 0.0013 for the camphene + (±)-limonene system, 0.0112 and 0.0003 for the camphene + (+)-3-carene system, and 0.0128 and 0.0002 for the (±)-limonene + (+)-3-carene system, respectively. These models were also used to predict the ternary system VLE data. The predictive results suggested that the NRTL model had the best prediction.