Abstract
Group contribution methods for estimating activity coefficients play an important role in solving varied types of problems in both the chemical and petrochemical industries. Although the results produced by these methods are generally satisfactory, attempts to improve the models and parameters used are continually being made. At the same time, the database available for taking into account concentration and temperature effects when fitting the parameters is steadily becoming larger. The improvements in the results obtained make these methods suitable for other areas of application (e.g. estimating retention data, taking into account supercritical components). The target must be to prepare a parameter matrix for the improved models which is comparable in size to that for the UNIFAC or ASOG method.
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