Influence of counterdiffusion effects on mass transfer coefficients in stirred tank reactors

Accurate knowledge of volumetric oxygen mass transfer coefficients in multiphase systems is important for successfully designing and efficient operation of process plants. As a result, a large number of papers on the determination of volumetric mass transfer coefficients kLa have been published in t...

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Autores principales:	S. Matthes, T. Merbach, J. Fitschen, M. Hoffmann, M. Schlüter
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Counterdiffusion effects Mass transfer coefficients Stirred tank reactor Micro sparger and conventional aeration Fine bubbles Degassing techniques Chemical engineering TP155-156
Acceso en línea:	https://doaj.org/article/a59c204107fd40489ae93d8418db9e63
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spelling	oai:doaj.org-article:a59c204107fd40489ae93d8418db9e632021-11-18T04:53:16ZInfluence of counterdiffusion effects on mass transfer coefficients in stirred tank reactors2666-821110.1016/j.ceja.2021.100180https://doaj.org/article/a59c204107fd40489ae93d8418db9e632021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2666821121000958https://doaj.org/toc/2666-8211Accurate knowledge of volumetric oxygen mass transfer coefficients in multiphase systems is important for successfully designing and efficient operation of process plants. As a result, a large number of papers on the determination of volumetric mass transfer coefficients kLa have been published in the literature. The dynamic degassing method is probably the most common method for determining the volumetric mass transfer coefficient. However, little work is known on the influence of countercurrent diffusion effects, arising from further dissolved components, on the volumetric mass transfer coefficient.For this reason, the effect of countercurrent diffusion is investigated in the present work by using different stripping gases to determine the volumetric oxygen mass transfer coefficient. Furthermore, the effect of counterdiffusion is investigated for both conventional aeration and aeration with microbubbles.The present work shows that the choice of stripping gas has a decisive influence on the determination of the volumetric oxygen mass transfer coefficient. Moreover, it can be shown that this effect is directly proportional to the solubility of the stripping gas in the aqueous phase. Simultaneous measurements of bubble size distributions allow determining mass transfer coefficients kL. A model is developed describing the decrease in the mass transfer coefficient as a function of the solubility of the stripping gas.Furthermore, it can be shown that for the experimental determination of volumetric oxygen mass transfer coefficients, the choice of stripping gas should be adapted to secondary gas types occurring within real processes achieving a better comparability.S. MatthesT. MerbachJ. FitschenM. HoffmannM. SchlüterElsevierarticleCounterdiffusion effectsMass transfer coefficientsStirred tank reactorMicro sparger and conventional aerationFine bubblesDegassing techniquesChemical engineeringTP155-156ENChemical Engineering Journal Advances, Vol 8, Iss , Pp 100180- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Counterdiffusion effects Mass transfer coefficients Stirred tank reactor Micro sparger and conventional aeration Fine bubbles Degassing techniques Chemical engineering TP155-156
spellingShingle	Counterdiffusion effects Mass transfer coefficients Stirred tank reactor Micro sparger and conventional aeration Fine bubbles Degassing techniques Chemical engineering TP155-156 S. Matthes T. Merbach J. Fitschen M. Hoffmann M. Schlüter Influence of counterdiffusion effects on mass transfer coefficients in stirred tank reactors
description	Accurate knowledge of volumetric oxygen mass transfer coefficients in multiphase systems is important for successfully designing and efficient operation of process plants. As a result, a large number of papers on the determination of volumetric mass transfer coefficients kLa have been published in the literature. The dynamic degassing method is probably the most common method for determining the volumetric mass transfer coefficient. However, little work is known on the influence of countercurrent diffusion effects, arising from further dissolved components, on the volumetric mass transfer coefficient.For this reason, the effect of countercurrent diffusion is investigated in the present work by using different stripping gases to determine the volumetric oxygen mass transfer coefficient. Furthermore, the effect of counterdiffusion is investigated for both conventional aeration and aeration with microbubbles.The present work shows that the choice of stripping gas has a decisive influence on the determination of the volumetric oxygen mass transfer coefficient. Moreover, it can be shown that this effect is directly proportional to the solubility of the stripping gas in the aqueous phase. Simultaneous measurements of bubble size distributions allow determining mass transfer coefficients kL. A model is developed describing the decrease in the mass transfer coefficient as a function of the solubility of the stripping gas.Furthermore, it can be shown that for the experimental determination of volumetric oxygen mass transfer coefficients, the choice of stripping gas should be adapted to secondary gas types occurring within real processes achieving a better comparability.
format	article
author	S. Matthes T. Merbach J. Fitschen M. Hoffmann M. Schlüter
author_facet	S. Matthes T. Merbach J. Fitschen M. Hoffmann M. Schlüter
author_sort	S. Matthes
title	Influence of counterdiffusion effects on mass transfer coefficients in stirred tank reactors
title_short	Influence of counterdiffusion effects on mass transfer coefficients in stirred tank reactors
title_full	Influence of counterdiffusion effects on mass transfer coefficients in stirred tank reactors
title_fullStr	Influence of counterdiffusion effects on mass transfer coefficients in stirred tank reactors
title_full_unstemmed	Influence of counterdiffusion effects on mass transfer coefficients in stirred tank reactors
title_sort	influence of counterdiffusion effects on mass transfer coefficients in stirred tank reactors
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/a59c204107fd40489ae93d8418db9e63
work_keys_str_mv	AT smatthes influenceofcounterdiffusioneffectsonmasstransfercoefficientsinstirredtankreactors AT tmerbach influenceofcounterdiffusioneffectsonmasstransfercoefficientsinstirredtankreactors AT jfitschen influenceofcounterdiffusioneffectsonmasstransfercoefficientsinstirredtankreactors AT mhoffmann influenceofcounterdiffusioneffectsonmasstransfercoefficientsinstirredtankreactors AT mschluter influenceofcounterdiffusioneffectsonmasstransfercoefficientsinstirredtankreactors
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Influence of counterdiffusion effects on mass transfer coefficients in stirred tank reactors

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