An Equation of State for Polar Mixtures: Calculation of High-Pressure Vapor-Liquid Equilibria of Trace Polar Solutes in Hydrocarbon Mixtures

A modification of the Soave equation of state has been used to calculate vapor-liquid phase equilibria for water, methanol, and mercaptans when these compounds are present in small amounts in hydrocarbon streams. The results of these calculations are compared with experimental data with encouraging results. The equation-of-state method for solving such problems offers advantages over the normal activity coefficient approach.