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Alleviating mass transfer limitations in industrial external-loop syngas-to-ethanol fermentation.

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Title: Alleviating mass transfer limitations in industrial external-loop syngas-to-ethanol fermentation.
Authors: Puiman, Lars1 (AUTHOR) L.Puiman@tudelft.nl, Abrahamson, Britt2 (AUTHOR), Lans, Rob G.J.M. van der1 (AUTHOR), Haringa, Cees1 (AUTHOR), Noorman, Henk J.1,3 (AUTHOR), Picioreanu, Cristian4 (AUTHOR)
Source: Chemical Engineering Science. Sep2022, Vol. 259, pN.PAG-N.PAG. 1p.
Subjects: Mass transfer coefficients, Mass transfer, Fermentation, Biomass gasification, Fermentation products industry, Gas analysis
Abstract: [Display omitted] • Detailed analysis on gas transfer rate in industrial syngas fermentation. • CFD reveals mass transfer limitation topography in external-loop gas-lift reactors. • Bubbles smaller than 2 mm are key to reach required mass transfer capacities. • The produced ethanol minimizes bubble size and increases gas hold-up. • Transport limitations in air–water systems can be alleviated in syngas fermentation. Mass transfer limitations in syngas fermentation processes are mostly attributed to poor solubility of CO and H 2 in water. Despite these assumed limitations, a syngas fermentation process has recently been commercialized. Using large-sale external-loop gas-lift reactors (EL-GLR), CO-rich off-gases are converted into ethanol, with high mass transfer performance (7–8.5 g.L-1.h−1). However, when applying established mass transfer correlations, a much poorer performance is predicted (0.3–2.7 g.L-1.h−1). We developed a CFD model, validated on pilot-scale data, to provide detailed insights on hydrodynamics and mass transfer in a large-scale EL-GLR. As produced ethanol could increase gas hold-up (+30%) and decrease the bubble diameter (≤2 mm) compared to air–water mixtures, we found with our model that a high volumetric mass transfer coefficient (650–750 h−1) and mass transfer capacity (7.5–8 g.L-1.h−1) for CO are feasible. Thus, the typical mass transfer limitations encountered in air–water systems can be alleviated in the syngas-to-ethanol fermentation process. [ABSTRACT FROM AUTHOR]
Copyright of Chemical Engineering Science is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 159168615
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Alleviating mass transfer limitations in industrial external-loop syngas-to-ethanol fermentation.
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  Data: <searchLink fieldCode="AR" term="%22Puiman%2C+Lars%22">Puiman, Lars</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> L.Puiman@tudelft.nl</i><br /><searchLink fieldCode="AR" term="%22Abrahamson%2C+Britt%22">Abrahamson, Britt</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lans%2C+Rob+G%2EJ%2EM%2E+van+der%22">Lans, Rob G.J.M. van der</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Haringa%2C+Cees%22">Haringa, Cees</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Noorman%2C+Henk+J%2E%22">Noorman, Henk J.</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Picioreanu%2C+Cristian%22">Picioreanu, Cristian</searchLink><relatesTo>4</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Chemical+Engineering+Science%22">Chemical Engineering Science</searchLink>. Sep2022, Vol. 259, pN.PAG-N.PAG. 1p.
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  Data: [Display omitted] • Detailed analysis on gas transfer rate in industrial syngas fermentation. • CFD reveals mass transfer limitation topography in external-loop gas-lift reactors. • Bubbles smaller than 2 mm are key to reach required mass transfer capacities. • The produced ethanol minimizes bubble size and increases gas hold-up. • Transport limitations in air–water systems can be alleviated in syngas fermentation. Mass transfer limitations in syngas fermentation processes are mostly attributed to poor solubility of CO and H 2 in water. Despite these assumed limitations, a syngas fermentation process has recently been commercialized. Using large-sale external-loop gas-lift reactors (EL-GLR), CO-rich off-gases are converted into ethanol, with high mass transfer performance (7–8.5 g.L-1.h−1). However, when applying established mass transfer correlations, a much poorer performance is predicted (0.3–2.7 g.L-1.h−1). We developed a CFD model, validated on pilot-scale data, to provide detailed insights on hydrodynamics and mass transfer in a large-scale EL-GLR. As produced ethanol could increase gas hold-up (+30%) and decrease the bubble diameter (≤2 mm) compared to air–water mixtures, we found with our model that a high volumetric mass transfer coefficient (650–750 h−1) and mass transfer capacity (7.5–8 g.L-1.h−1) for CO are feasible. Thus, the typical mass transfer limitations encountered in air–water systems can be alleviated in the syngas-to-ethanol fermentation process. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Chemical Engineering Science is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.ces.2022.117770
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        Text: English
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      – SubjectFull: Fermentation
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      – SubjectFull: Biomass gasification
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      – SubjectFull: Gas analysis
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      – TitleFull: Alleviating mass transfer limitations in industrial external-loop syngas-to-ethanol fermentation.
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              M: 09
              Text: Sep2022
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