A SIMPLE METHOD FOR CALCULATION OF APPROXIMATE PHASE BOUNDARIES

A computational procedure for construction of approximate phase bounda ries without iterative determination of equilibrium phase compositions has been developed. The method, which is very easy to implement, redu ces the equilibrium conditions for mixtures containing an arbitrary nu mber of components to only two equations to be solved for temperature and pressure. In addition a refinement procedure is described for exac t calculation of points on the phase boundary, which enables fast conv ergence in the critical region without the requirement for composition derivatives of the component fugacity coefficients.