A GROUP CONTRIBUTION METHOD FOR ESTIMATING HEAT OF VAPORIZATION AT 298-K

For the purpose of estimating accurately heat of vaporization at 298 K(DELTA-H-nu, 298(O)), this paper proposes a group contribution method based on the quasi-chemical lattice theory. The precision of the proposed method is higher than that of any previous group contribution method. The mean deviation between calculated and experimental DELTA-H-nu, 298(O)) is only 1.1% for the 288 hydrocarbons and 1-substituted hydrocarbons examined. The method can also be applied to the estimation of DELTA-H-nu, 298(O)) for multi-substituted hydrocarbons.