Peng-Robinson or Redlich-Kwong? Twu or Soave α-Function? Which Combination of Cubic Equation of State (CEoS) and α-Function Produces More Accurate and Consistent Results for Pure Components.

This study tested the accuracy and thermodynamic consistency of four CEoS/α-function models. The objective was to find the most suitable CEoS/α-function combo for producing accurate and consistent physical and derivative properties for nonpolar, polar and hydrogen bonding components at subcritical conditions. The models tested were PR-Twu, PR-Soave, RK-Twu, and RK-Soave.