Experimental and estimated saturated vapour pressures of aroma compounds

The saturated vapour pressure of d-linalool, 2-nonanone, d-limonene and iso amyl acetate were measured using a static method at different temperatures from 223 to 468 K. From the experimental values, Antoine's constants were d etermined to enable the calculations of the saturated vapour pressures at a given temperature. The saturated vapour pressure of the four aroma compoun ds at 298 K were respectively 27, 59, 200 and 733 Pa. These results were co mpared with those obtained using different estimation methods (Antoine-Grai n, Watson, Lee-Kesler, Gomez-Thodos, Grain and Mackay). Gomez-Thodos' model was found to be the most accurate method for the estimation of the saturat ed Vapour pressure of these aroma compounds. The importance of accurate sat urated vapour pressures for the calculation of other thermodynamic properti es used in the study of vapour-liquid equilibria of aroma compounds is disc ussed. (C) 1999 Elsevier Science B.V. All rights reserved.