Correlation for prediction of latent heat of pure components incorporating renormalization group formulations with corresponding-states principle

Abstract

A corresponding-states correlation has been developed using renormalization group theory, phenomenological scaling theory and Pitzer et al.'s (1955) three-parameter corresponding-states principle to predict latent heats of vaporization for simple fluids (aliphatic and atomatic hydrocarbons, including complex coal-liquid model compounds) from the freezing point to the critical point. The resulting correlation consists of an expansion in the acentric factor which is truncated after the second term, in accordance with the linear dependence observed for experimental data. The dimensionless latent heat of vaporization defined as L * = L/RT c is given by L * = L (0) * + ω * L (1) *, where L * is a nonanalytic function (Torquato and Stell, 1982). Subsequent tests of the ability of this correlation to predict latent heats of vaporization over a board domain of reduced temperatures for a large number of different types of compounds have confirmed the validity of the present approach. The results show root-mean-square deviations between reported and predicted latent heats of vaporization in the range 0.46–6.93% for aliphatic and aromatic hydrocarbons including one-, two- and three-ring coal-liquid model compounds in the range of reduced temperatures 0.02 < ϵ = ( T c T)/ T c < 0.69.