Application of new, modified BWR equations of state to the corresponding-states prediction of natural gas properties

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.