Status and results of group contribution methods

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Abstract
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 has been de- veloped. Furthermore the solution of groups concept has been applied to equations of state. This allows the simultaneous description of sub and supercritical compounds and at the same time the prediction of other important properties, such as densities, enthalpies, etc. .

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