Vapour pressures and enthalpies of vaporization of aliphatic esters

Molar enthalpies of vaporization of n-alkyl formates (with alkyl groups C5–C8), n-alkyl propanoates (with alkyl groups C5–C8) and n-pentyl acetate were obtained from the temperature dependence of the vapour pressure measured by the transpiration method. A large number of the primary experimental results on temperature dependences of vapour pressures have been collected from the literature and have been treated uniformly in order to derive vaporization enthalpies at the reference temperature 298.15 K. The available data were successfully checked for internal consistency.

► We measured vapour pressures and vaporization enthalpies of n-alkyl formates, acetates and propanoates. ► We examined consistency of new and available in the literature data ► Enthalpies of vaporization at 298 K correlate linearly with numbers of C-atoms in the ester.