COMMENTS ON THE PROBLEMATIC NATURE OF THE CALCULATION OF SOLID-LIQUIDEQUILIBRIUM

The problematic nature of the calculation of phase equilibria involvin g solid components is discussed. The concept of 'the stability criteri on', as introduced, accounts for the necessity of a suitable set of pa rameters for any given activity coefficient model, yielding an appropr iate shape of the Gibbs energy function in the whole domain of the equ ilibrium diagram. The use of a unique reference state (pure liquid at the temperature and pressure of the system), for both solid and liquid phases, is another fact that must be remembered when correlating and predicting these types of equilibria. (C) 1997 Elsevier Science B.V.