Calculation of vapor-liquid equilibrium using group solubility parameter model

An equation for calculating activity coefficient has been proposed on the b asis of Group Solubility Parameter (GSP) model. The group solubility parame ter is divided into four dimensions (contributions) and their values were d etermined by regression to fit the VLE of 172 binary systems selected from the literature. For these binary systems, the total average calculated devi ations by the model were 3.52% in y(1) and 2.80% in P. The GSP model could be applied to predicting VLE of other binary or multi-component systems wit h good accuracy. Compared with other group contribution models, GSP model r equires less adjustable parameters and their values can be easily determine d.