KAGAKU KOGAKU RONBUNSHU
Online ISSN : 1349-9203
Print ISSN : 0386-216X
ISSN-L : 0386-216X
Mass Transfer Resistance and Selectivity in Catalytic Simultaneous Gas-Liquid Reaction with Suspended Solid
Tohru SakaiMakoto SeoNobuichi Ohi
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1975 Volume 1 Issue 2 Pages 155-159

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Abstract

The resistance to mass transfer and the effect of mass transfer on selectivity in a catalytic gas-liquid reaction were evaluated for the simultaneous hydrogenation of allyl alcohol with a suspended Pd/C catalyst in a stirred vessel at atmospheric pressure.
In this system, the total resistance consists of three resistances in series, i. e., those to transfer hydrogen through the liquid surrounding bubble and solid (1/kLab, 1/ksas) and the one offered to the chemical reaction taking place on the surface of catalyst.
To separate 1/ ksas from the chemical resistance at surface of catalyst for transition region where both resistances are comparable in magnitude, hydrogen concentration at catalyst surface (CHs) was related to that at gas-liquid interface (CH*) with the ratio of overall rate to chemical reaction rate. Thus 1/ ksas can be evaluated individually using the values of CHs, CH*, 1/ kLab and chemical reaction rate previously determined.
The correlation between 1/kLab or 1/ ksas and operating variables such as gas flow rate and rate of stirring were examined.
Selectivities determined under various operating conditions were in good agreement with calculated values.
When mass transfer is rate-controlling, estimation of the selectivity in connection with the operating variables was proposed using the kinetics of the chemical reaction taking place on catalyst surface.

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© by THE SOCIETY OF CHEMICAL ENGINEERS, JAPAN
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