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Mean residence time and variance in steady counterflow separations

✍ Scribed by Donald K. Roper; Edwin N. Lightfoot

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
982 KB
Volume
49
Category
Article
ISSN
0009-2509

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✦ Synopsis

Analytical expressions for the mean residence time and variance of species separated in steady counterRow have been derived. The counterflow column was modelled as a multiport sytem composed of discrete equilibrium stages with inlets and outlets closed to diffusion. Limiting cases of the relations for residence time and variance reduce to well-known expressions for fixed-bed separations. Mean residence times of species separated in fixed-bed and counterRow systems are compared.

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Moment analysis has become widely used in recent years as a noncompartmental approach to the estimation of mean residence time (MRT) and steady-state volume of distribution (Vd,,) from single-dose data.1-5 In 1983, the method was first extended to the multiple-dosing situation by Bauer and Gibaldi.6