van der Waals型3次状態方程式による気液飽和密度計算

概要

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Applicability of van der Waals type cubic equations of state to calculate saturated properties, such as vapor pressure and saturated molar volumes of vapor and liquid, was examine. In the present study, Scott-I type expression proposed for hard sphere was adopted to improve the repulsion term. Large error in the calculation of molar volume of liquid phase is shown, as pointed out in general, for 2 -constant Soave-Redlich-Kwong and Peng-Robinson equations of state. On the other hand, Ishikawa-Chung-Lu equation of state (2 constant), in which the repulsion term is expressed by Scott-I, gives good results because the constants are adjusted using vapor pressure and saturated liquid densities for each substance. The 3 -constant cubic equation of state proposed by Fuller seems to be one of successful equations of state to present well the saturated properties involving liquid densities. We proposed a modified Fuller equation of state replacing the repulsion term by Scott-I type expression. As a result,however, calculation performance was not much improved.
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