Volumetric Property Improvement for the Soave-Redlich-Kwong Equation of State

This work presents a temperature-dependent volume translation to improve the volume properties of the Soave-Redlich-Kwong equation of state (SRK EOS) for pure fluids and mixtures. The volume translation is generalized as a function of the critical parameters and reduced temperature. The SRK EOS with the generalized volume translation can accurately represent the densities for different polar and nonpolar fluids in the saturated and supercritical region, including alkanes, olefins, alkines, cycloolefins, aromatics, alcohols, ethers, ketones, halogenated hydrocarbons, and inorganic molecules. The average relative deviation is 1.73% for pure fluids in the saturated region. The generalized volume translation SRK EOS (VTSRK EOS) has better accuracy than other methods and EOSs in the saturated and supercritical regions.