Mass transfer in bubble column for industrial conditions—effects of organic medium, gas and liquid flow rates and column design |
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Authors: | H. Chaumat F. Augier H. Delmas |
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Affiliation: | a Laboratoire de Génie Chimique, Z.A Basso Cambo, 5 rue Paulin Talabot, 31106 Toulouse cedex 1, France b Rhodia, Centre de Recherches de Lyon, 85 av. des Frères Perret, B.P 62, 69192 St. Fons cedex, France |
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Abstract: | Most of available gas-liquid mass transfer data in bubble column have been obtained in aqueous media and in liquid batch conditions, contrary to industrial chemical reactor conditions. This work provides new data more relevant for industrial conditions, including comparison of water and organic media, effects of large liquid and gas velocities, perforated plates and sparger hole diameter.The usual dynamic O2 methods for mass transfer investigation were not convenient in this work (cyclohexane, liquid circulation). Steady-state mass transfer of CO2 in an absorption-desorption loop has been quantified by IR spectrometry. Using a simple RTD characterization, mass transfer efficiency and kLa have been calculated in a wide range of experimental conditions.Due to large column height and gas velocity, mass transfer efficiency is high, ranging between 40% and 90%. kLa values stand between 0.015 and and depend mainly on superficial gas velocity. No significant effects of column design and media have been shown. At last, using both global and local hydrodynamics data, mass transfer connection with hydrodynamics has been investigated through kLa/εG and kLa/a. |
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Keywords: | Bubble column Measurement method Mass transfer Multiphase flow Hydrodynamics Residence time distribution |
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