Abstract
The interfacial area a chem in a gas—liquid contactor as determined by the chemical method deviates from the true geometrical interfacial area a geo, because the overall conversion of the gas phase reactant represents an incorrect average if bubble sizes and residence times are not uniform. The deviations of a chem from a geo become larger the broader the distribution τ b/ d b and the higher the overall conversion Ω A of the reactant in the gas phase. Model calculations, which take into account both the effect of gas phase backmixing as well as the effect of bubble coalescence on the deviation of a chem from a geo, are performed for a mechanically agitated gas—liquid reactor and a bubble column at practical micro- and macromixing conditions. For a gas—liquid model reaction, which is first-order in the gas phase reactant, it is found that: (1) for a mechanically agitated reactor the error in a chem will always be smaller than 10% if Ω A is lower than 0.99, and (2) for a bubble column the error in a chem will be smaller than 20% for most practical applications if Ω A is lower than 0.99. Gas—liquid model reaction systems with absorption of CO 2 in alkanolamine solutions are recommended for the determination of interfacial area in gas—liquid contactors.
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