The Lee-Kesler method (LK) may be used to predict liquid and vapor enthalpies, entropies and densities. The method uses the three parameter corresponding states theory, which states that all fluids having the same acentric factor must have the same fluid properties at the same reduced temperature and pressure. Special mixing rules are used to determine the mixture reduced properties.
For most fluids, the method gives accurate vapor compressibility factors. It also gives reasonable results for slightly polar mixtures, but is not recommended for highly polar mixtures or those which form strongly associative hydrogen bonds.
See "Lee-Kesler (LK)" under "Generalized Correlation Methods" in Chapter 2, Volume 1 of the PRO/II Reference Manual for more information.
Application Guidelines
The method may be used for nearly all natural gas and refinery applications over a wide range of temperatures and pressures.