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Mathematical and Experimental Modelling of Sorption Processes in a Fixed Bed Adsorber

M. Šoóš, P. Rajniak, and R. Žajdlík

Department of Chemical and Biochemical Engineering, Faculty of Chemical Technology, Slovak University of Technology, SK-812 37 Bratislava

 

E-mail: soos@cvt.stuba.sk

Received: 19 May 2000

Abstract: The aim of this work was to present experimental sorption measurements and elution curves for the system silica gel—water vapour, which is characteristic by capillary condensation. The experiments were performed at different temperatures, flow-rates of inert gas, and different relative humidities. It was found that with increasing temperature the plateau in the plot of relative humidity vs. time moved to lower values of relative humidity and the time of the experiment decreased. The phenomenon of capillary condensation — hysteresis in adsorption-desorption isotherms was manifested for the temperature up to 94ºC and very likely it exists at temperatures higher than the boiling point. A comparison of experimental measurements and the solution of a mathematical model further was presented for the fixed bed with axial dispersion. The results from the solution of this model neglecting capillary condensation were very different from the experimental measurements. This also confirmed the need to consider the phenomenon of capillary condensation.

Full paper in Portable Document Format: 546ba489.pdf

 

Chemical Papers 54 (6b) 489–495 (2000)

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