J. Ratanapisit et Jf. Ely, Application of new, modified BWR equations of state to the corresponding-states prediction of natural gas properties, INT J THERM, 20(6), 1999, pp. 1721-1735
The accurate description of mixtures includes both single-phase (bulk) prop
erties and the location of phase equilibrium boundaries, e.g., properties t
hat depend upon partial molar properties. In order to estimate these proper
ties, many variants of corresponding-states theory have been developed, esp
ecially for nonpolar mixtures such as those found in natural gas systems. I
n this work we have developed two new, modified BWR equations of state for
two natural gas components (rt-pentane and n-heptane) and used these equati
ons in a reformulated (Teja-like) Lee-Kesler model. The reformulated model
has been rested on bulk-phase propel lies of hydrocarbon systems, in both t
he pure and the mixed states. Results have been obtained using the original
Lee-Kesler model, the extended corresponding-states theory, and the multif
luid corresponding-states principle using several combinations of reference
fluids chosen from this and previous equation of state studies. Details of
the new equations of state and theoretical comparisons are reported.