화학공학소재연구정보센터
Korean Journal of Chemical Engineering, Vol.38, No.5, 924-937, May, 2021
Flow pattern study, gas hold-up and gas liquid mass transfer correlations in a bubble column: Effect of non - coalescing water - organic mixtures
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Experiments of hydrodynamic and gas liquid mass transfer were carried out in a bubble column of 19.4 cm internal diameter and of 4m height. The liquid phase can be either tap water or a coalescence inhibitor system, using aqueous solutions of three alcohols (ethanol, 2-propanol and 1-butanol) with a volumetric concentration of 0.05% v/v and sodium dodecyl sulfate: SDS (10?3mol/L) as an anionic surfactant. The hydrodynamic study involved placing wall pressure sensors in different axial positions of a bubble column to determine the gas hold-up in different regions and the influence of non-coalescing system on its evolution. The overall liquid movement induced by bubbles and the residence time distribution analysis of liquid phase was performed by using inductivity sensors. Gas hold-up results showed that the presence of the gas is more important in the zone far enough to the gas distributor (zone II). The results of the volumetric mass transfer coefficient (KLa) revealed that KLa decreased with the addition of alcohol, especially when the number of carbons in alcohol increased. KLa decreased more with the addition of anionic surfactant. It was also proven that a decrease in KLa was due to a decrease in KL, which was due to a decrease of bubble rise velocity as well as of the diffusivity when alcohol or ionic surfactant was added. Correlations were developed linking gas holdup and gas-liquid mass transfer coefficient to superficial gas velocity and surface tension gradient.
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