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Processes
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Multiphase Reaction Process Design and Optimization
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Multiphase Reaction Process Design and Optimization

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Chemical Processes and Systems".

Deadline for manuscript submissions: 15 May 2024 | Viewed by 5529

Special Issue Editors

Prof. Dr. Erik von Harbou

E-Mail Website
Guest Editor
Laboratory of Reaction and Fluid Process Engineering, TU Kaiserslautern, P.O. Box 3049, 67653 Kaiserslautern, Germany
Interests: chemical engineering; chemical reaction engineering process simulation separation technology
Prof. Dr. Michael Schlüter

E-Mail Website
Guest Editor
TU Hamburg, Institute of Multiphase Flow, Eissendorfer Str. 38, 21073 Hamburg, Germany
Interests: multiscale mass transfer; reactive flows; scale-up
Special Issues, Collections and Topics in MDPI journals
Dr. Maike Baltussen

E-Mail Website
Guest Editor
Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
Interests: gas-liquid, gas-solid and gas-liquid-solid hydrodynamics; multi-scale modelling

Special Issue Information

Dear Colleagues,

The design and optimization of multiphase reactor processes are due to the vast possibilities of syntheses, catalyst systems, designs, and process conditions, one of the most challenging tasks within chemical engineering. The chemical industry is facing major changes. To manufacture products sustainably with a low carbon footprint, new synthesis routes must be established. This also requires the design of new multiphase reactors enabling the desired products to be manufactured reliably and with a high-energy efficiency. In this respect, tremendous developments in computer technology, data science, and new measurement methods provide new opportunities for experimental studies, modeling, and the simulation of multiphase processes and reactors.

This Special Issue on “Multiphase Reaction Process Design and Optimization” seeks high-quality works focusing on the latest novel advances in the design and optimization of multiphase reactor processes. Topics include, but are not limited to:

  • New measurement techniques to investigate multiphase phenomena in reactors;
  • Investigation of reaction kinetics and heat and mass transfer in multiphase systems;
  • New model approaches to describe multiphase reactors, including both local phenomena such as the flow of dispersed phases and the large simulation of multiphase reactor processes;
  • Application of advance data science such as machine learning to investigate the behavior of multiphase reactors.

Prof. Dr. Erik von Harbou
Prof. Dr. Michael Schlüter
Dr. Maike Baltussen
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Processes is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • multiphase reactors
  • dispersed flow
  • reaction kinetics
  • heat and mass transfer
  • computational fluid dynamics
  • process simulation
  • population balance modelling

Published Papers (3 papers)

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Research

26 pages, 23160 KiB  
Article
Gas/Liquid Operations in the Taylor-Couette Disc Contactor: Continuous Chemisorption of CO2
by Georg Rudelstorfer, Rafaela Greil, Max Vogi, Matthäus Siebenhofer, Susanne Lux and Annika Grafschafter
Processes 2023, 11(6), 1614; https://doi.org/10.3390/pr11061614 - 25 May 2023
Viewed by 1006
Abstract
Gas/liquid contactors are widely used in chemical and biotechnological applications. The selection and design of bubble-column-type gas/liquid contactors requires knowledge about the gas distributor design to provide appropriate gas flow patterns. This study presents the continuous chemisorption of CO2 in 0.1 molar [...] Read more.
Gas/liquid contactors are widely used in chemical and biotechnological applications. The selection and design of bubble-column-type gas/liquid contactors requires knowledge about the gas distributor design to provide appropriate gas flow patterns. This study presents the continuous chemisorption of CO2 in 0.1 molar sodium hydroxide solution in a counter currently operated gas/liquid Taylor-Couette disc contactor (TCDC). This vertical-column-type contactor is a multi-stage agitated gas/liquid contactor. The performance of a lab-size TCDC contactor in gas/liquid mass transfer operations was investigated. The apparatus design was adjusted for gas/liquid operations by installing perforated rotor discs to provide a rotational-speed-dependent dispersed gas phase holdup in the column. The parameters of dispersed gas phase holdup, volumetric mass transfer coefficient and residence time distribution were measured. In the first step, hydraulic characterization was performed. Then, the efficiency in gas/liquid operations was investigated by continuous neutralization of 0.1 molar sodium hydroxide with a gas mixture of 30 vol% CO2 and 70 vol% N2. Temperature, rotational speed and gas flow rate were varied. The desired pH value of pH 9 at the column outlet was kept constant by adjusting the sodium hydroxide feed. From the experimental results, the volume-based liquid-side mass transfer coefficient kLa was deduced in order to model the reaction according to the two-film theory over the column height. The CSTR cascade model fitted the experimental data best. The experimental results confirm stable and efficient reactive gas/liquid contact in the Taylor-Couette disc contactor. Full article
(This article belongs to the Special Issue Multiphase Reaction Process Design and Optimization)
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16 pages, 9946 KiB  
Article
Unsteady Mass Transfer in Bubble Wakes Analyzed by Lagrangian Coherent Structures in a Flat-Bed Reactor
by Lotta Kursula, Felix Kexel, Jürgen Fitschen, Marko Hoffmann, Michael Schlüter and Alexandra von Kameke
Processes 2022, 10(12), 2686; https://doi.org/10.3390/pr10122686 - 13 Dec 2022
Viewed by 1624
Abstract
To increase the yield and selectivity in reactive bubbly flows, the gas-liquid interactions have to be understood in depth. In the current fundamental study, flow and concentration data of the wakes of two-dimensional bubbles in an organic solvent are obtained experimentally in a [...] Read more.
To increase the yield and selectivity in reactive bubbly flows, the gas-liquid interactions have to be understood in depth. In the current fundamental study, flow and concentration data of the wakes of two-dimensional bubbles in an organic solvent are obtained experimentally in a flat-bed reactor. The unsteady mass transport phenomena in these turbulent wakes of two freely rising, two-dimensional bubbles with bubble Reynolds numbers Re=949 and Re=388 are evaluated by analyzing Lagrangian Coherent Structures (LCS). To reveal how LCS govern the transport of dissolved gas in bubble wakes, and therefore affect gas-liquid reactions, LCS in two-dimensional velocity fields are computed and compared with concentration fields of dissolved gas. The analysis of backward Finite Time Lyapunov Exponent (bFTLE) fields reveals coherent fluid dynamic structures for both bubble Reynolds numbers studied. In the higher bubble Reynolds number case, two types of coherent structures are found, which hinder the mixing of the dissolved gas and the liquid bulk. Repelling LCS are found to enclose parcels transported into the vortices, and indicate thus, which fluid parcels can possibly take part in chemical reactions. Due to higher mixing, unveiled by details from the LCS and FTLE analyses, and therefore increased contact area between dissolved gas and fresh liquid, higher yields of reaction products are suggested for the lower bubble Reynolds number case in this two-dimensional study. This is contradicting the rule of thumb that mixing increases for higher bubble Reynolds numbers. Full article
(This article belongs to the Special Issue Multiphase Reaction Process Design and Optimization)
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21 pages, 3470 KiB  
Article
Model-Based Investigation of the Interaction of Gas-Consuming Reactions and Internal Circulation Flow within Jet Loop Reactors
by Ferdinand Breit, Oliver Bey and Erik von Harbou
Processes 2022, 10(7), 1297; https://doi.org/10.3390/pr10071297 - 30 Jun 2022
Cited by 1 | Viewed by 1978
Abstract
Jet loop reactors are standard multiphase reactors used in chemical, biological and environmental processes. The strong liquid jet provided by a nozzle enforces both internal circulation of liquid and gas as well as entrainment and dispersion of the gas phase. We present a [...] Read more.
Jet loop reactors are standard multiphase reactors used in chemical, biological and environmental processes. The strong liquid jet provided by a nozzle enforces both internal circulation of liquid and gas as well as entrainment and dispersion of the gas phase. We present a one-dimensional compartment model based on a momentum balance that describes the internal circulation of gas and liquid phase in the jet loop reactor. This model considers the influence of local variations of the gas volume fraction on the internal circulation. These local variations can be caused by coalescence of gas bubbles, additional gas-feeding points and gas consumption or production. In this work, we applied the model to study the influence of a gas-consuming reaction on the internal circulation. In a comprehensive sensitivity analysis, the interaction of different parameters such as rate of reaction, power input through the nozzle, gas holdup, reactor geometry, and circulation rate were investigated. The results show that gas consumption can have a significant impact on internal circulation. Industrially relevant operating conditions have even been found where the internal circulation comes to a complete standstill. Full article
(This article belongs to the Special Issue Multiphase Reaction Process Design and Optimization)
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