Correlation and prediction of vapor‐liquid equilibria with the redlich‐kwong equation of state

A modified Redlich‐Kwong equation has been applied to the calculation of phase equilibria in multicomponent systems. The two parameters of the Redlich‐Kwong equation are treated as temperature functions. They are obtained for each pure component from experimental vapor pressures and liquid densities with the help of a generalized fugacity coefficient correlation for saturated vapors. The need to submit coefficients for pure components is thus eliminated. At least one experimental vapor‐liquid equilibrium point is required to establish an interaction constant for each binary system. Applications have been made to binary and multicomponent systems containing hydrocarbons, hydrogen, carbon dioxide, and hydrogen sulfide.