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Thermodynamic Regularities for Associating Fluids from Statistical Associating Fluid Theory Equation of State

A. Maghari* and Z. Safaei

Department of Physical Chemistry, University College of Science, University of Tehran, Tehran, Iran

In this work, we used a statistical associating fluid theory to analyze two important thermodynamic regularities for some associating fluids, including water, methanol and ethanol. The studied regularities included: (i) the common bulk modulus point on the isotherms of the reduced bulk modulus versus reduced density, (ii) near linearity of the reduced isothermal bulk modulus as a function of reduced pressure. In this work, we also reported the influence of the molecular size and interaction strength on the bulk modulus point.

Keywords: Equation of state, Isothermal bulk modulus, Statistical associating fluid theory, Tai-Murnaghan, Thermodynamic regularities