The volumetric liquid-phase mass transfer coefficient in bubble columns

Two-Phase Bubble Columns: A Comprehensive Review

“…It is worth noting that some authors have also considered the influence of the gas viscosity proposed by [306]. Finally, Ozturk et al [173] (Figures 37 and 38) and Gopal and Sharma [106] (Figure 39) studied the influence of the gas phase on k L a and observed a lower influence compared with the above-mentioned operating parameters.…”

“…where n can be between 0.7 and 0.92 [285,302,305,306]. Thus, the relationship between k L a and U G is less than linear, in agreement with the considerations proposed in Section 2.6.1-the relationship between k L a and ε G is related to the shape of the gas hold-up curve, depending on the flow regime; indeed, in the transition/heterogeneous flow regimes, the dispersed phase is transported through the column as large "coalescence-induced" bubbles, having a lower residence time and thus, a lower mass transfer rate.…”

New Approaches for Theoretical Estimation of Mass Transfer Parameters in Both Gas-Liquid and Slurry Bubble Columns

“…Both the gas holdup and the volumetric liquid-phase mass transfer coefficient k L a increase with gas velocity. The correlations of Hughmark (1967), Akita and Yoshida (1973) and Hikita et al (1981) predict well k L a values in bubble columns of diameter up to 5.5 m. Öztürk et al (1987) also proposed correlation for k L a prediction in various organic liquids. Suh et al (1991) investigated the effects of liquid viscosity, pseudoplasticity and viscoelasticity on k L a in a bubble column and they developed their own correlation.…”

“…However, the reactor diameter was not considered in their relation. Hikita et al (1981), Hammer et al (1984) and Merchuk and BenZvi (1992) developed also a correlation for prediction of the volumetric liquid-phase mass transfer coefficient k L a. Calderbank (1967) reported that values of k L decrease with increasing apparent viscosity corresponding to the decrease in the bubble rise velocity which prolongs the exposure time of liquid elements at the bubble surface.…”

Determination of the liquid pool surfactant and protein concentration for semi-batch foam fractionation columns

“…The isotherm data for those proteins were modeled by Guzman et al (1986) and more recently by Fainerman et al (2003). There are several correlations for k L a in bubble columns available in the literature (Akita and Yoshida, 1973;Hikita et al, 1981;Kawase et al 1987;Özturk et al, 1987;Cho and Wakao, 1988;Akita, 1989). Deckwer and Schumpe (1993) established a comparison between several correlations and experimental data and they concluded that the Özturk et al correlation can better represent the experimental data.…”