Abstract

CARDONA, L. F.. A simple and generalized model to estimate the vaporization enthalpy of pure substances. Entre Ciencia e Ingenieria [online]. 2017, vol.11, n.22, pp.37-42. ISSN 1909-8367.

The heat of vaporization of a pure substance at its normal boiling temperature is a very important property in many chemical processes. In this work, a new generalized model was developed to predict vaporization enthalpy of pure substances. From values of critical pressure, critical temperature, normal boiling temperature and experimental data of vaporization enthalpy for 300 pure substances and using Lasdon et al., algorithm which minimize the sum of the squares of the relative deviation in vaporization enthalpy were determined the constants characteristics of the new equation. To validate the new model it was evaluated for 227 pure substances and generated percent relative average deviation of 0.0821%. The results were compared with Riedel, Chen, Trouton, Zhao et al., Vetere, Liu, Mehmandoust et al., Morgan, Carruth and Kobayashi equations and the comparison indicates that the proposed method provide more accurate results than other methods used in this work.

Keywords : enthalpy; pure substances; model.

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