Applications of the Redlich-Kwong equation of state

In most cases, the Soave-Redlich-Kwong (SRK) equation of state is more appropriate to use and yields better results than the Redlich-Kwong (RK) equation of state. We suggest that you use the RK equation of state over the SRK equation of state only for simple systems that are nearly ideal. In general, the RK equation of state is appropriate for systems in which the following is true for all components in the system.

Currently, you can use the RK equation of state only as a supplementary thermodynamic method for your Fluid Types. Specifically, you can select the RK equation of state only to calculate vapor phase properties for compositional Fluid Types that use the NRTL method.