Applications of the Lee-Kesler equation of state

The Lee-Kesler (LK) equation of state (EOS) can evaluate the volumetric and thermodynamic properties of vapor and liquid, that is, the compressibility factor, the enthalpy, the entropy, and the density. It covers the entire practical range of Tr (0.3 to 4.0) and Pr (0 to 10.0) of the hydrocarbon processing cycle.

The LK EOS is more accurate than the Curl-Pitzer (CP) method and more consistent with the published literature. Moreover, near the critical region and the low-temperature region, the LK EOS gives improved evaluations of properties over those that the CP method gives. It is reliable over a wide range of conditions for nonpolar and slightly polar components and their mixtures. Though the LK EOS gives reasonable results over the entire practical range, it is most accurate in the subcooled and superheated regions.