Preface Group contribution methods have been used to calculate the properties of pure components, such as viscosity, surface tension, critical property etc.。Recently,group contribution methods are also used to predict vapor liquid equilibrium of the systems in which the composition of the components can be known exactly. In this paper, the group contribution method is used to predict the vapor ...

In the search for an accurate yet inexpensive method to predict thermodynamic properties of large hydrocarbon molecules, we have developed an automatic and adaptive distance-based group contribution (DBGC) method. The method characterizes the group interaction within a molecule with an exponential decay function of the group-to-group distance, defined as the number of bonds between the groups. ...

Group contribution methods, such as UNIFAC or ASOG can be successfully applied to the prediction of the real behavior of non electrolyte mixtures. Therefore these methods are used worldwide in the different process simulators for the synthesis and design of separation processes. Since the well known group contribution methods still show some weaknesses a modified version of the UNIFAC method ha...