1995•Chemical Engineering CommunicationsRequires access

A CUBIC EQUATION OF STATE BASED ON A SIMPLIFIED HARD-CORE MODEL

M. Mohsen‐Nia, Hamid Moddaress, Gubran Mansoor

Abstract

The Redlich-Kwong (RK) equation of state introduced in 1949 has been considered the most accurate two-constant-parameter cubic equation of state. The other cubic equations which are more accurate than the RK equation contain either three, or more, parameters and/or their parameters are temperature- dependent. A New two-constant-parameter cubic equation of state, $ is introduced using a simplified molecular theory of hard-sphere fluids for its repulsive term. This two-constant-parameter cubic equation of state appreciably increases the accuracy of thermodynamic property predictions and phase equilibria of pure fluids and flluid mixtures over the equations of this category.

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Key concepts: Cubic function, Equation of state, Hard core, Constant (computer programming), Thermodynamics, Cubic crystal system, Phase (matter), Mathematics