Experimental and estimated saturated vapour pressures of aroma compounds

The saturated vapour pressure of d-linalool, 2-nonanone, d-limonene and isoamyl acetate were measured using a static method at different temperatures from 223 to 468 K. From the experimental values, Antoineʹs constants were determined to enable the calculations of the saturated vapour pressures at a given temperature. The saturated vapour pressure of the four aroma compounds at 298 K were respectively 27, 59, 200 and 733 Pa. These results were compared with those obtained using different estimation methods (Antoine–Grain, Watson, Lee–Kesler, Gomez–Thodos, Grain and Mackay). Gomez–Thodosʹ model was found to be the most accurate method for the estimation of the saturated vapour pressure of these aroma compounds. The importance of accurate saturated vapour pressures for the calculation of other thermodynamic properties used in the study of vapour–liquid equilibria of aroma compounds is discussed.