Corresponding-states correlation for compressed liquid densities

Abstract

A corresponding-states correlation, originally developed by Iglesias-Silave and Hall for the prediction of the saturated liquid densities, has been extended successfully to the compressed state. The Tait equation has been employed for this purpose and its parameters have been correlated to permit accurate prediction of the liquid densities of compressed fluids. The proposed correlation in this work needs the values of the critical constants, the acentric factor, the freezing temperature, the liquid density at the freezing point, and an adjustable parameter used to determine the saturated liquid densities. If the freezing point parameters are not available, another experimentally available low-temperature datum point may be used instead. Utilizing this correlation, we have calculated the liquid density of a large variety of compounds including liquefied noble gases, a number of inorganic diatomic and polyatomic molecules, saturated, aromatic, and aliphatic hydrocarbons, organic acids, alcohols, and refrigerants. The correlation is also compared with the corresponding-states liquid densities by Hankinson et al. and a recent correlation by Nasrifar et al. It is shown that this correlation is superior to both of them.