Mass Transfer Coefficients in Mechanically Agitated Gas‐Liquid Contactors

Markopoulos, Joannis; Christofi, Chrystalla; Katsinaris, Ioannis

doi:10.1002/ceat.200600394

Cited by 33 publications

(26 citation statements)

References 43 publications

(60 reference statements)

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“…We used the classical correlation based on the theory of isotropic turbulence using the power consumption per liquid volume and the superficial gas velocity to compare our experimental data. 27,[30][31][32][33][34][35] …”

Section: Correlationsmentioning

confidence: 99%

Determination of mass transfer resistances of fast reactions in three‐phase mechanically agitated slurry reactors

Stamatiou

Muller

2016

AIChE Journal

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A methodology for the determination of mass transfer resistances of fast reactions in three-phase mechanically agitated slurry reactors under the reaction conditions is presented. The mass transfer resistances affect significantly the overall mass transfer rate, the design equation and consequently the scale up of the reactor. There is not established methodology to separate the mass transfer resistances under reaction conditions by changing catalyst loading and manipulating the process variables, pressure and agitation speed. This allows to avoid the use of different catalyst particles and give the chance to calculate the mass transfer resistances without caring about the type of catalyst. We calculate each mass transfer resistance under conditions which do not allow to neglect any of the resistances. It is shown that the level off of mass transfer rate which is developed in the plot of mass transfer rate against agitation speed plots is not enough to determine the limiting regime. The hydrogenation of styrene over Pd/C (5% catalyst content) is used as case study to demonstrate the methodology.

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Section: Correlationsmentioning

confidence: 99%

Determination of mass transfer resistances of fast reactions in three‐phase mechanically agitated slurry reactors

Stamatiou

Muller

2016

AIChE Journal

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“…Markopoulos et al (2007) compared the results which were obtained by other authors for agitated Newtonian and non-Newtonian aerated liquids. The comparative analysis carried out by Markopoulos et al (2007) shows that significant disagreement is observed taking into account the form of the correlations for k L a. Therefore, no single equation exists representing all of the mass transfer data given in literature.…”

Section: Survey Of the Results For Gas-liquid Systemmentioning

confidence: 93%

“…In literature, there are a large number of correlations for the prediction of volumetric mass transfer coefficients k L a in mechanically stirred gas-liquid systems (Linek et al, 1982(Linek et al, , 1987Nocentini et al, 1993;Gogate & Pandit, 1999;Vasconcelos et al, 2000;Markopoulos et al, 2007). Markopoulos et al (2007) compared the results which were obtained by other authors for agitated Newtonian and non-Newtonian aerated liquids. The comparative analysis carried out by Markopoulos et al (2007) shows that significant disagreement is observed taking into account the form of the correlations for k L a.…”

Section: Survey Of the Results For Gas-liquid Systemmentioning

confidence: 99%

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Mass Transfer in Multiphase Mechanically Agitated Systems

Kiełbus-Rąpała¹,

Karcz²

2011

Mass Transfer in Multiphase Systems and Its Applications

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“…Bearing the low impact of surface tension and seeking generalization, the mass transfer data obtained for STR in surfactin was correlated by the simplified power correlation [26],…”

Section: Experiments With a Fluid Foil Impellermentioning

confidence: 99%

Surfactant Effects on Aeration Performance of Stirred Tank Reactors

et al. 2008

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The effect of surfactants on aeration performance in stirred tank reactors (STR) at high rates of foaming is studied. The volumetric oxygen transfer coefficient (k L a) and foaming activity estimated as foaming height (H f ) were determined. Biotechnology of lipopeptide biosurfactants from aerobic organisms, e.g., Bacillus subtilis were addressed. Using model solutions of known foam-generating properties, high-molecular weight surfactin and low-molecular weight sodium dodecyl sulphate (SDS), as well as impellers of different types, with flat and fluidfoil blades, clues on the concentration dependence of STR oxygen transfer and foaming as well as options for foam reduction in the presence of biosurfactant were sought. In response to a two-fold decrease of surface tension by surfactin, k L a values decreased up to 30 % but remained within the range expected for the mixing system in water; the experiments with SDS showing stronger dependence on surfactant concentration and surface tension. Mixing of surfactant media by a standard six-blade disc turbine (RT) imposed rate limitations on gassing. A lowshear impeller Narcissus (NS) could be used to avoid bulk foam outflow, while preserving k L a values that remained unchanged. The 'power per unit volume' correlation of k L a in stirred tanks is tested in the presence of surfactin.

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Mass Transfer Coefficients in Mechanically Agitated Gas‐Liquid Contactors

Cited by 33 publications

References 43 publications

Determination of mass transfer resistances of fast reactions in three‐phase mechanically agitated slurry reactors

Determination of mass transfer resistances of fast reactions in three‐phase mechanically agitated slurry reactors

Mass Transfer in Multiphase Mechanically Agitated Systems

Surfactant Effects on Aeration Performance of Stirred Tank Reactors

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