Derivation of a new model for equilibrium constant calculation in separation processes of nonideal mixtures of multicomponent hydrocarbons

The validity of a newly derived equation which is thoroughly theoretical is investigated in this article. This new equation is mainly used for equilibrium-constant calculation of multicomponent mixtures of hydrocarbons in nonideal two phase systems (liquid/vapor). It is based on taking ideas from a new theory of a contemporary scientist who believed that activity is equal to minimum thermodynamic volume. An equation for calculation of this minimum volume which has been developed before is the basis of this article methodology. The new equilibrium-constant equation has been used for a flash evaporation process as an example. The results from a typical calculation have been compared with a semi-empirical graph and that of Aspen Plus software in order to evaluate the validity and applicability of this new equation.