Diusion of Ethanol Vapours in Activated Carbon Particles

Bobok, D. and Besedová, E. Diusion of Ethanol Vapours in Activated Carbon Particles Chemical Papers, Vol.57, No. 1, 2003, 39-44

Document type: Článok z časopisu / Journal Article
Collection: Chemical papers  

Author(s) Bobok, D.
Besedová, E.
Title Diusion of Ethanol Vapours in Activated Carbon Particles
Journal name Chemical Papers
Publication date 2003
Year available 2003
Volume number 57
Issue number 1
ISSN 0366-6352
Start page 39
End page 44
Place of publication Poland
Publisher Versita
Collection year 2003
Language english
Subject 290000 Engineering and Technology
290600 Chemical Engineering
Abstract/Summary In adsorbers with a bed height equal to the diameter of activated carbon particles the course of stepwise adsorption of ethanol from a stream of air and the course of stepwise desorption of ethanol by a stream of air with a lower content of ethanol compared with adsorption or by a stream of pure air were examined. The stepwise measurements were performed at a concentration of ethanol in air ranging from 0 to 0.35 mol m−3, which corresponds to the concentration of ethanol on activated carbon from 0 to 4180 mol m−3. From experimentally measured data effective diffusion coefficients De were calculated for each adsorption and desorption step. The calculated values of De are ranging from 1.182x10−10 to 6.308x10−10 m2 s−1. These values are dependent on the adsorbate concentration. From experimental data also values of De were calculated for each time of the stepwise adsorption and desorption. These values were used for the determination of the dependence of De on the adsorbate concentration: De = −4.7424x10−21q3 + 5.6130x10−17q2 − 5.9684x10−14q + 1.7647x10−10 By comparison of the obtained values of the e ective di usion coecient with values calculated by models it follows that during the transport of ethanol in particles of activated carbon Supersorbon HS4 both Knudsen di usion and surface di usion are decisive.
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