Mass Transfer in a Rotating Packed Bed: A Critical Review

Wang, Zhihong; Yang, Tao; Liu, Zhixi; Wang, Shicheng; Gao, Yang; Wu, Mingou

doi:10.1016/j.cep.2019.03.020

Cited by 66 publications

(32 citation statements)

References 117 publications

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“…In the end zone, a parabolic droplet motion is observed with the increase of rotating speed from 300-900 rpm, since the initial droplet velocity in the radial direction is lower than that in tangential direction. Further, a phenomena of back-mixing, called "end effect" in our review [12] on mass transfer process in RPB, was also confirmed to have a superiority in processing intensification on mass transfer [13]. In the packing zone, droplets move in a radial spiral and distribute irregularly.…”

Section: Droplet Velocity In Rpbsupporting

confidence: 56%

“…A comparison on particle diameter is conducted between RPB and conventional deposition process under gravity. Droplet force balance has been discussed in Equation (12) and the droplet diameter is calculated by two equations in Table 4, which were derived from Equations (12) and (13), considering mainly the centrifugal force in RPB (or gravity in deposition process) and drag force. Droplet diameter in different force fields is related to fluid density, droplet density, fluid velocity, droplet velocity and main acceleration.…”

Section: Principle Of Processing Intensification In Rpbmentioning

confidence: 99%

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Droplet Characteristics of Rotating Packed Bed in H2S Absorption: A Computational Fluid Dynamics Analysis

Wang

Yang

et al. 2019

Processes

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Rotating packed bed (RPB) has been demonstrated as a significant and emerging technology to be applied in natural gas desulfurization. However, droplet characteristics and principle in H2S selective absorption with N-methyldiethanolamine (MDEA) solution have seldom been fully investigated by experimental method. Therefore, a 3D Eulerian–Lagrangian approach has been established to investigate the droplet characteristics. The discrete phase model (DPM) is implemented to track the behavior of droplets, meanwhile the collision model and breakup model are employed to describe the coalescence and breakup of droplets. The simulation results indicate that rotating speed and radial position have a dominant impact on droplet velocity, average residence time and average diameter rather than initial droplet velocity. A short residence time of 0.039–0.085 s is credited in this study for faster mass transfer and reaction rate in RPB. The average droplet diameter decreases when the initial droplet velocity and rotating speed enhances. Restriction of minimum droplet diameter for it to be broken and an appropriate rotating speed have also been elaborated. Additional correlations on droplet velocity and diameter have been obtained mainly considering the rotating speed and radial position in RPB. This proposed formula leads to a much better understanding of droplet characteristics in RPB.

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Section: Droplet Velocity In Rpbsupporting

confidence: 56%

Section: Principle Of Processing Intensification In Rpbmentioning

confidence: 99%

Droplet Characteristics of Rotating Packed Bed in H2S Absorption: A Computational Fluid Dynamics Analysis

Wang

Yang

et al. 2019

Processes

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“…The rotating packed bed came from the area of process intensification in a high gravity field and was first patented in 1981 by Ramshaw and Mallinson 9 . Since then many investigations on different types and designs of RPB have been performed, showing the positive effect of the rotation on the mass transfer and process performance for applications like distillation, adsorption, stripping, absorption, mixing and even reaction compared to conventional apparatuses summarized in different comprehensive reviews 10‐12 . The central element of any RPB is an annular packing inside a circular motor‐driven rotor within a static casing similar to vertically arranged basket centrifuge.…”

Section: Introductionmentioning

confidence: 99%

Aroma absorption in rapeseed oil using rotating packed bed

Lukin

Pietzka

Wingartz

et al. 2020

Flavour & Fragrance J

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An increasing consumers’ call for natural aromas fuels the development of biotechnological aroma production. Although aroma fermentation is quite advantageous, especially severe product losses of volatile compounds through the bioreactor off‐gas may challenge the downstream processing. The application of novel process intensification methods to overcome the common drawbacks of conventional apparatuses might be helpful on a way to commercial competitiveness of biotechnological aromas. This study explored the suitability of rotating packed bed (RPB), a rotating mass transfer enhancing machine, for the absorption of model aroma compounds in rapeseed oil. Increasing the rotation speed from 500 to 2750 rpm led to two‐ to threefold higher absorption efficiencies at elsewise constant conditions. Aiming for an enriched aromatic intermediate, 2.5 L of rapeseed oil was processed in a recycle for 200 minutes, and a final concentration of benzaldehyde of 0.323 ± 0.026 g/Loil was achieved. Compared to packed columns, the RPB outperforms at equal packing depth or requires less packing area to deliver same efficiency. Especially, the use of custom 3D‐printed spiral packing with elaborated wall film flow combined with rotation supported liquid distribution allows using absorbents with viscosities as high as 100 mPa·s at low pressure drop increase. However, small dimensions severely limit the performance of a laboratory‐scale RPB as the casing contributes disproportionally to mass transfer.

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“…Wichtige Argumente für die Umrüstungsentscheidung waren erzielbare Produktqualitäten, signifikant verbesserte Ausbeuten, Sicherheitsaspekte und kurze Kapitalrückflusszeiten. Weitere Beispiele aus der Forschung für Prozessintensivierung in der Verfahrenstechnik sind u. a. rotierende Destillations‐, Absorptions‐ und Extraktionsapparate sowie 3D‐gefertigte Wärmetauscher , .…”

Section: Beschleunigte Globalisierte Innovationunclassified

Trends der chemischen Prozessindustrie

Schäfer

Sauer

2020

Chemie Ingenieur Technik

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Aktuelle Trends aus der chemischen Prozesstechnik im Rahmen der Begleitforschung des Forschungsnetzwerkes Energie in Industrie und Gewerbe (EE4InG) werden vorgestellt. Wir gehen davon aus, dass die Trends zirkuläre Wirtschaft und beschleunigte globalisierte Innovation (Modularisierung, Prozessintensivierung und Digitalisierung) bis 2030 auf die Chemieindustrie wirken. Die Technologieentwicklung anhand dieser Trends erlaubt es dem Chemieingenieurswesen, zukünftig entscheidende Beiträge zur Flexibilisierung und Defossilisierung der Wertschöpfungsketten zu leisten.

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Mass Transfer in a Rotating Packed Bed: A Critical Review

Cited by 66 publications

References 117 publications

Droplet Characteristics of Rotating Packed Bed in H2S Absorption: A Computational Fluid Dynamics Analysis

Droplet Characteristics of Rotating Packed Bed in H2S Absorption: A Computational Fluid Dynamics Analysis

Aroma absorption in rapeseed oil using rotating packed bed

Trends der chemischen Prozessindustrie

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