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The dominant time constant for distillation columns
S. Skogestad and M. Morari

Computers & Chemical Engineering
11 (6), 1987, pages 607-617

Abstract

It is shown that the dominant part of the dynamic composition response of two-product distillation columns can be approximated by a linear first-order response. This applies also for large perturbations to the column. The numerical value of this dominant time constant (Τc) can be obtained from steady-state simulations. A simple analytical expression for small peturbations is derived which provides insight into the variation of (Τc) with operating conditions. The time constant Τc does not apply when there are changes in the internal flows only.