Vapor pressure and enthalpy of vaporization of trimethylolpropane and carboxylic acids esters

Vapor pressure and molar standard enthalpies of vaporization of esters of 2-ethyl-2-(hydroxymethyl)-1,3-propandiol (trimethylolpropane, TMP) and straight and branched carboxylic acids with chain length C1, C3-C6, were determinated by the transpiration method. A linear correlation of vaporization enthalpies of trimethylolpropane esters with the number of carbon atoms and with the Kovat's indices on the non-polar DB-1 GC column has been found. Enthalpies of vaporization of tested compounds were also calculated by QSPR-method. These results were checked by experimental values.