Chemical and Biomolecular Engineering Research and Publications


Date of this Version



This paper was originally published by "The Canadian Journal of Chemical Engineering" Volume 67, June 1989.


Using data for excess Gibbs energy gh. and enthalpy of mixing hE, temperature dependent parameters of the UNlQUAC equation have been estimated for twenty four systems of binary mixtures. Fifteen of them include data for gh and hE at more than one isotherm. These parameters are later tested in predicting the gh and hE data simultaneously and representing the effect of temperature on such data. The UNIQUAC equation with temperature dependent parameters represents larger values of maximum heat of mixing than does the UNlQUAC equation with the parameters independent of temperature.