Gas holdup and bubble size behavior in a large-scale slurry bubble column reactor operating with an organic liquid under elevated pressures and temperatures

Two-Phase Bubble Columns: A Comprehensive Review

“…The increased recirculation was shown by Krishna et al [130]. Urseanu et al [131] observed the decrease in ε G (d c between 0.15 and 0.23 m) while working with viscous fluids, in agreement with Behkish et al [132], who noticed that the effect of the column diameter on viscous fluid is higher. The data collected by Fai et al [105] and Yoshida and Akita [112] show that the effect of the column diameter on ε G is negligible for columns larger than d c = 0.15 m. Hughmark [133] found an effect of column size on ε G up to a diameter of 0.10 m. Kata [134] [1,24,98,140], as supported by different investigators [8,31,141].…”

“…Most of the authors reported a positive effect of the temperature, T c , over ε G [56,86,117,132,177,180,181,[186][187][188]; on the other hand, Pohorecki et al [187] observed no effect of T c -possibly caused by the evaporation-and some authors observed a decrease of ε G T c increased [78,136,189,190]. It is worth noting that the studies reporting a decrease in ε G used at low U G and, in accordance with Yang et al [190], turbulence is low under these conditions,.…”

“…The literature also agrees when reporting a plateau for a certain value of pressure, above which, no significant effect of pressure on ε G is observed. The value of the plateau depends on the operating conditions [132], and typically, values are 6 MPa [185], 7 MPa [180] and 10 MPa [178]. The effect of pressure can be related to the liquid phase (i.e., µ L and ρ L ) and gas phase (i.e., ρ G ) parameters.…”

A New Approach for the Prediction of Gas Holdup in Bubble Columns Operated under Various Pressures in the Homogeneous Regime

“…Most of the works in bubble columns dealing with gas holdup measurement and prediction are based on deep bubble beds (Hughmark, 1967;Akita and Yoshida, 1973;Kumar et al, 1976;Hikita et al, 1980;Kelkar et al, 1983;Behkish et al, 2007). A unique work concerned with gas holdup ε G under homogeneous bubbling conditions was published by Hammer et al (1984).…”

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

“…Godbole et al (1984) proposed a correlation for gas holdup prediction in CMC solutions. Most of the works in bubble columns dealing with gas holdup measurement and prediction are based on deep bubble beds (Hughmark, 1967;Akita and Yoshida, 1973;Kumar et al, 1976;Hikita et al, 1980;Kelkar et al, 1983;Behkish et al, 2007). A unique work concerned with gas holdup ε G under homogeneous bubbling conditions was published by Hammer et al (1984).…”