Calculation of vapor pressures from model fragrance emulsions during evaporation

The vapor pressure data from previous publications of a model fragrance emu lsion system consisting of water, an aromatic fragrance phenethyl alcohol, an aliphatic one limonene, and a nonionic surfactant Laureth 4, were used t o calculate the variation in vapor pressures of both fragrances and water d uring free evaporation. The evaporation path in a three-dimensional four-co mponent phase diagram was estimated from the vapor pressures. The results showed as expected that the high note fragrance compound evapor ates first followed by water and the low note one. Unexpectedly, it was fou nd that vapor pressure of low note fragrance, phenethyl alcohol, is signifi cantly increased during evaporation.