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B. Wittgens and S. Skogestad, ``Evaluation of dynamic models of distillation columns with emphasis on the initial response'', Preprint IFAC Symposium DYCORD+95, 4th IFAC Symposium on Dynamics and Control of Chemical Reactors, Distillation Columns and Batch Processes, Helsingør, Denmark, 7-9 June 1995, 261-267.

A rigorous model for staged high purity distillation based on first principles is developed. The importance of the tray hydraulics to obtain good agreement between simulation and experiment is demonstrated. Analytical expressions to derive the hydraulic time constants the vapor constant for models with simplified tray hydraulics are presented. The validity of these key parameters is verified by comparison to experimental data.