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Residence time distribution study for the catalytic packing MULTIPAK®

A. Górak, M. Jaroszyński, and A. Kołodziej

Fachbereich Bio-und Chemieingenieurwesen, Universität Dortmund, Emil Figge Strasse 70, D-44221 Dortmund, Germany



Received: 31 March 2006  Revised: 9 June 2006  Accepted: 20 June 2006

Abstract: Residence time distribution (RTD) experiments were carried out using the catalytic packing MULTIPAK® in a 250 mm inner diameter column. The axial dispersion coefficients and dynamic liquid hold-up were derived from the RTD curves. Both hold-up and axial Péclet number were correlated in terms of gas and liquid Reynolds numbers. Free-draining experiments were performed to determine the dynamic and static liquid hold-ups.
The measured axial dispersion coefficients were higher than those presented in other studies. The dynamic hold-up derived from RTD agreed with total hold-up from free-draining experiments. The static hold-up was found very high, even higher than the dynamic one, due to the liquid accumulated inside the catalyst bed. Possibly, the liquid considered “static” from the viewpoint of the free-draining experiments becomes “dynamic” during the normal column operation.

Full paper is available at

DOI: 10.2478/s11696-006-0074-0


Chemical Papers 60 (6) 404–409 (2006)

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