DETERMINATION OF ENVIRONMENTALLY RELEVANT PHYSICAL-CHEMICAL PROPERTIES OF SOME FATTY-ACID ESTERS

Fat models frequently use input parameters :hat are defined at environ mental conditions. In a recently developed gas-liquid chromatography m ethod (GC-VAP), vapor pressures, heats of vaporization, and heat capac ity differences (gas-liquid) of fatty acid esters are determined over a large temperature range that includes environmental temperatures. Th is method also allows an accurate determination of the normal boiling point temperature of a substance. Literature values of vapor pressure, boiling point temperature, and heat of vaporization at 298.15 K for t he chosen esters are all in excellent agreement with those determined with the developed method. Correlations between carbon number and heat of vaporization are high.