Effective uniquac equation in phase equilibrium calculation

A new equation for the excess Gibbs energy similar to the UNIQUAC equation is presented. The equation is found to give better data reduction results for those binary systems where an alcohol is one of the components. Successful prediction of ternary vapor-liquid equilibria using only binary parameters is demonstrated. To obtain improved calculated results for ternary liquid-liquid equilibria, a total of six parameters (two per binary) are not sufficient and one additional parameter C is usually necessary, as shown in illustrative examples. C must be the same for three binary systems constituting a ternary system.