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A novel inclined rotating tubular fixed bed reactor concept for enhancement of reaction rates and adjustment of flow regimes.

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Title: A novel inclined rotating tubular fixed bed reactor concept for enhancement of reaction rates and adjustment of flow regimes.
Authors: Härting, Hans-Ulrich1 h.haerting@hzdr.de, Lange, Rüdiger2 Ruediger.lange@tu-dresden.de, Larachi, Faïçal3 faical.larachi@gch.ulaval.ca, Schubert, Markus1 m.schubert@hzdr.de
Source: Chemical Engineering Journal. Dec2015, Vol. 281, p931-944. 14p.
Subjects: Chemical kinetics, Alpha-methylstyrol, Computed tomography, Ionizing radiation, Hydride transfer reactions, Addition reactions
Abstract: The inclined rotating tubular fixed bed reactor has been introduced recently as a novel reactor concept for multiphase processes, especially for heterogeneously catalyzed gas–liquid reactions with a mass transfer limitation of the gas phase (Härting et al., 2015; DOI: http://dx.doi.org/10.1016/j.ces.2015.02.008 ). It is based on the adjustment of a beneficial gas–liquid distribution in the cross section of the fixed bed that allows for complete utilization of the fixed bed accompanied by periodic wetting and draining of the catalyst. The hydrodynamics in gas–liquid co-current downflow are studied by applying a compact gamma-ray computed tomography system for different organic liquids and gas phase properties as well as various fixed bed packing materials. Four different flow regimes with stratified, sickle, annular and dispersed flow patterns are identified. Pressure drop and liquid saturation are presented as a function of reactor inclination and rotation. Inclination of the reactor is applied to force phase separation and the superimposed rotation of the clamped fixed bed results in a favorable wetting intermittency via periodic catalyst immersion. A significant rate enhancement of the hydrogenation of alpha-methylstyrene to cumene under severe limitations of the mass transfer of the gas phase is observed in the novel reactor concept at separated flow conditions. In addition, the potential for an efficient quenching of hotspots for exothermic reactions is demonstrated. [ABSTRACT FROM AUTHOR]
Copyright of Chemical Engineering Journal is the property of Elsevier B.V. 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.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 109356498
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  Data: <searchLink fieldCode="AR" term="%22Härting%2C+Hans-Ulrich%22">Härting, Hans-Ulrich</searchLink><relatesTo>1</relatesTo><i> h.haerting@hzdr.de</i><br /><searchLink fieldCode="AR" term="%22Lange%2C+Rüdiger%22">Lange, Rüdiger</searchLink><relatesTo>2</relatesTo><i> Ruediger.lange@tu-dresden.de</i><br /><searchLink fieldCode="AR" term="%22Larachi%2C+Faïçal%22">Larachi, Faïçal</searchLink><relatesTo>3</relatesTo><i> faical.larachi@gch.ulaval.ca</i><br /><searchLink fieldCode="AR" term="%22Schubert%2C+Markus%22">Schubert, Markus</searchLink><relatesTo>1</relatesTo><i> m.schubert@hzdr.de</i>
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  Data: <searchLink fieldCode="DE" term="%22Chemical+kinetics%22">Chemical kinetics</searchLink><br /><searchLink fieldCode="DE" term="%22Alpha-methylstyrol%22">Alpha-methylstyrol</searchLink><br /><searchLink fieldCode="DE" term="%22Computed+tomography%22">Computed tomography</searchLink><br /><searchLink fieldCode="DE" term="%22Ionizing+radiation%22">Ionizing radiation</searchLink><br /><searchLink fieldCode="DE" term="%22Hydride+transfer+reactions%22">Hydride transfer reactions</searchLink><br /><searchLink fieldCode="DE" term="%22Addition+reactions%22">Addition reactions</searchLink>
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  Data: The inclined rotating tubular fixed bed reactor has been introduced recently as a novel reactor concept for multiphase processes, especially for heterogeneously catalyzed gas–liquid reactions with a mass transfer limitation of the gas phase (Härting et al., 2015; DOI: http://dx.doi.org/10.1016/j.ces.2015.02.008 ). It is based on the adjustment of a beneficial gas–liquid distribution in the cross section of the fixed bed that allows for complete utilization of the fixed bed accompanied by periodic wetting and draining of the catalyst. The hydrodynamics in gas–liquid co-current downflow are studied by applying a compact gamma-ray computed tomography system for different organic liquids and gas phase properties as well as various fixed bed packing materials. Four different flow regimes with stratified, sickle, annular and dispersed flow patterns are identified. Pressure drop and liquid saturation are presented as a function of reactor inclination and rotation. Inclination of the reactor is applied to force phase separation and the superimposed rotation of the clamped fixed bed results in a favorable wetting intermittency via periodic catalyst immersion. A significant rate enhancement of the hydrogenation of alpha-methylstyrene to cumene under severe limitations of the mass transfer of the gas phase is observed in the novel reactor concept at separated flow conditions. In addition, the potential for an efficient quenching of hotspots for exothermic reactions is demonstrated. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Chemical Engineering Journal is the property of Elsevier B.V. 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.cej.2015.06.092
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        Text: English
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        PageCount: 14
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        Type: general
      – SubjectFull: Alpha-methylstyrol
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      – SubjectFull: Computed tomography
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      – SubjectFull: Ionizing radiation
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      – SubjectFull: Hydride transfer reactions
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      – SubjectFull: Addition reactions
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      – TitleFull: A novel inclined rotating tubular fixed bed reactor concept for enhancement of reaction rates and adjustment of flow regimes.
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              Text: Dec2015
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