Gas holdup and mass transfer in bubble column reactors operated at elevated pressure

Letzel, H.M.; Schouten, J.C.; Krishna, Rajamani; Bleek, C.M. van den

doi:10.1016/s0009-2509(98)00418-7

Cited by 202 publications

(158 citation statements)

References 0 publications

Supporting

Mentioning

138

Contrasting

Unclassified

Order By: Relevance

“…The two effects proving the reliability of kLa results were tested: (i) the effect of pressure step non-ideality and (ii) the effect of gas composition (air absorption and pure The correlation between volumetric mass transfer coefficient and gas holdup is presented in Figure 8 and shows good agreement with published results by several authors [12,[14][15][16], however, again at low gas flow rates only, i.e., gas holdups (u G < 0.07 m/s, ε G < 15%). At high gas flow rates (u G > 0.07 m/s), there are significant differences between the present data and the data published by other authors.…”

Section: Discussionsupporting

confidence: 79%

“…For correlating experimental data of kLa there are two approaches: either to express their dependency on the gas superficial velocity (more frequent) or their dependency on the gas holdup data (see the correlations [9,12,[14][15][16] in Table 1). Table 3 resumes both types of correlations and it includes also the correlation for gas holdup data and operating conditions for our measurements.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Measurement of Volumetric Mass Transfer Coefficient in Bubble Columns

et al. 2018

View full text Add to dashboard Cite

Abstract:The paper presents a brief overview of experiments on volumetric mass transfer coefficient in bubble columns. The available experimental data published are often incomparable due to the different type of gas distributor and different operating conditions used by various authors. Moreover, the value of the coefficient obtained experimentally is very sensitive to the particular method and to the physical models used in its evaluation. It follows that the Dynamic Pressure Method (DPM) is able to provide physically correct values not only in lab-scale contactors but also in pilot-scale reactors. However, the method was not correctly proven in bubble columns. In present experiments, DPM was employed in a laboratory-scale bubble column with a coalescent phase and tested in the pure heterogeneous flow regime. The method was successfully validated by the measurements under two different conditions relevant to the mass transfer. First, the ideal pressure step was compared with the non-ideal pressure step. Second, the pure oxygen absorption was compared with the simultaneous oxygen-and-nitrogen absorption. The obtained results proved that DPM is suitable for measuring the mass transport in bubble columns and to provide reliable data of volumetric mass transfer coefficient.

show abstract

Section: Discussionsupporting

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Measurement of Volumetric Mass Transfer Coefficient in Bubble Columns

et al. 2018

View full text Add to dashboard Cite

show abstract

“…(25) largely underestimates the transition gas velocity. This observation was also made by Letzel et al (1999), who also compared their results with the correlation of Reilly et al (1994), which provide a better agreement. On the other hand, Eq.…”

Section: Flow Regime Transitionsupporting

confidence: 62%

“…Focusing on the batch mode, the typical values of U trans found in the literature for air-water systems in bubble columns of diameter greater than 0.15 m range between 0.01 and 0.08 m/s under ambient operating conditions (Dargar and Macchi, 2006;Hur et al, 2013;Krishna et al, 1991;Letzel et al, 1999;Reilly et al, 1994;Ruzicka et al, 2001;Schumpe and Grund, 1986;Urseanu, 2000;Wilkinson et al, 1992;Zahradnik et al, 1997). The value depends mainly on the sparger type.…”

Section: Flow Regime Transitionmentioning

confidence: 97%

Comprehensive experimental investigation of counter-current bubble column hydrodynamics: Holdup, flow regime transition, bubble size distributions and local flow properties

Besagni

Inzoli

2016

Chemical Engineering Science

108

View full text Add to dashboard Cite

“…Additional verification of the experimental results is performed by comparing the experimental result in the current study to literature data under similar air-water systems [19,[21][22][23][24][25][26][27][28]. Since there is limited literature data available for low L/D ratio conditions, only experimental results obtained at L/D ratio of 7.2 are used for comparison.…”

Section: Comparison To Literature Datamentioning

confidence: 92%