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Interpretation of mass transfer measurements in bubble columns considering dispersion of both phases

โœ Scribed by K.-H. Mangartz; Th. Pilhofer

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

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โœฆ Synopsis

Mass transfer measurements in two bubble columns with an inner diameter of 1OOresp. I40 mm with the systemsairlwaterlcarbondioxideand nitrogen/n-propanol/carbondioxidehavebeeaevaluated with theaxialdispersion model. The dispersion coefficients of both phases have been determined in separate investigations. As the results revealed a strong influence of the liquid viscosity, additional dispersioncoefficient measurements have been carried out with the system air/glycol. It could be shown that the liquid phase dispersion coefficient decreases with increasing viscosity while the gas phase dispersion coefficient increases with increasing liquid viscosity. Both coefficients are strongly dependent on the gas throughput and the column diameter. Using these coefficients, the mass transfer coefficients have been calculated by fitting the calculated concentration profile to the measuredvaluesand by splitting the volumetric mass transfer coefficient with the experimental value of the interfacial area. The results agree best with a correlation of Calderbank and Moo-Young.

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