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Mass transfer in trickle-bed reactors at low reynolds number

✍ Scribed by Fritz Turek; Rüdiger Lange

Publisher
Elsevier Science
Year
1981
Tongue
English
Weight
804 KB
Volume
36
Category
Article
ISSN
0009-2509

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✦ Synopsis

Mass transfer rates were determined in a 3.4cm id. trickle-bed reactor in the absence of reaction by absorption measurements and in presence of reaction. Gas flow rates were varied from O-100 I/h and liquid flow rates from O-l.5 I/h. The catalyst particles were crushed to an average diameter of 0.054 and 0.09 cm. Mass transfer coefficients remained unaffected by change in gas flow rate but increased with liquid rate. The data from absorption measurements were evaluated with predictions based upon plug-flow and axial dispersion model. Mass transfer coefficients were found greater in case of axial dispersion model than that of plug-flow model specially at low Reynolds number (Re, < I ).

Hydrogenation of cr-methylstyrene to cumene using a Pd/Alj02 catalyst was taken as a model reaction. Intrinsic kinetic studies were made in a laboratory-stirred-autoclave. Mass transfer coefficients were determined using these intrinsic kinetic data from the process kinetic measurements in trickle-bed reactor. Mass transfer coefficients under reaction conditions were found to be considerably higher than those obtained by absorption measurements.

Correlations were suggested for predicting mass transfer coefficients at low Reynolds number.

GAS TO LIQUID MASS TRANSFER IN ABSENCE OF REACTION

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