Most of the EOSs were originally developed for pure components. Each EOS has a number of parameters which are usually based on the properties of pure components such as critical properties and acentric factor. Extending the equations that had been developed for pure components for mixtures is important because most practical problems are encountered with multicomponent mixtures. There are three approaches to extending equations to mixtures (
Riazi, 2005). The first approach is determination of an input parameter such as critical temperature, critical pressure, and acentric factor for mixtures (usually called pseudocritical properties). Then, the parameters of an EOS are calculated by the properties of the mixture, and these parameters ...