Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

The vaporization enthalpies of gamma-octanolactone, gamma- and delta-undecanolactone and gamma and delta-dodecanolactone used commercially as flavor ingredients are reported as are their vapor pressures over the temperature range T = (298.15 to 350) K. Vaporization enthalpies at T = 298.15 K of: (66.0 +- 3.9), (79.4 +- 4.4), (80.1 +- 4.5), (83.9 +- 4.6), and (84.61 +- 4.7) kJ/mol and vapor pressures also at T = 298.15 K of: (2.8 +- 0.9), (0.12 +- 0.05), (0.09 +- 0.04), (0.04 +- 0.02), and (0.03 +- 0.02) Pa, respectively, have been evaluated by correlation gas chromatography experiments. The vaporization enthalpies of the lactones studied are reproduced within +-0.5 kJ/mol using a group additivity scheme reported previously for gamma- and delta-lactones. The vaporization enthalpies of the gamma- and delta-lactones are compared to a similar series of omega-lactones.