Title: Selection of solvents for the extractive rectification by precalculated equilibrium data
Abstract: For mixtures which are difficult to separate by ordinary distillation because components show small or no differences in their volatilities, extractive distillation is an alternative. In taking into consideration this possibility, the search for suitable solvents is the most important step. As a prerequisite such solvents must influence the volatilities of components to be separated in different degree. A quantitative criterion for the performance of solvents is the ratio of activity coefficients at infinite dilution in the solvent which may be evaluated by prediction methods such as UNIFAC. For this purpose the following strategy is used. In a first step a search, based on UNIFAC parameters, is carried out for structural groups showing selective effects on the components of the system to be separated. The resulting structural groups are then employed for the selection of real compounds as solvents. VLE data for these solvents are then either calculated with the UNIFAC model or taken from a VLE data bank, if experimental data are available. This procedure is demonstrated by an example from aliphatic/aromatic separation.
Publication Year: 1979
Publication Date: 1979-11-01
Language: en
Type: article
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Cited By Count: 1
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