Cross-contamination; Membrane permeance; Microreactor; PDMS; Solution-diffusion model; Cross contamination; Desaturation; Direct synthesis; Liquid reaction; Mass-transport process; Membrane reactor; Micro-reactor; Reaction media; Chemistry (all); Chemical Engineering (all); Industrial and Manufacturing Engineering; Applied Mathematics; General Chemical Engineering; General Chemistry
Abstract :
[en] Microstructured membrane reactors present a promising approach to master the productivity and safety challenges during the direct synthesis of hydrogen peroxide. However, various mass transport processes occur in this complex system. In order to gain a deeper understanding of these processes, the saturation and desaturation behaviour of the liquid reaction medium with the gaseous reactants is investigated experimentally to examine possible cross-contamination. Moreover, the employed PDMS membrane's permeances to hydrogen and oxygen are researched at different pressures, by using a variable-pressure/constant-volume setup for the behaviour at ambient pressure and a constant-pressure/variable-volume setup for the behaviour at elevated pressures. A mathematical model in MATLAB is applied to simulate the results. It is shown that a certain desaturation of the gasses through the membrane occurs, and the results are underlined by the modelled ones using a solution-diffusion model in MATLAB. Thus a constant flushing of the gas channels of the reactor is required for safety reasons. Moreover, the measured permeance values indicate that the species transport is mainly limited by the diffusion in the liquid phase and not the membrane resistance.
Disciplines :
Chemical engineering
Author, co-author :
Trinkies, Laura L. ; Institute for Micro Process Engineering (IMVT), Karlsruhe Institute of Technology, Germany
Düll, Andrea; Institute for Micro Process Engineering (IMVT), Karlsruhe Institute of Technology, Germany
Zhang, Jinju; Institute for Micro Process Engineering (IMVT), Karlsruhe Institute of Technology, Germany
Urban, Sebastian ; Laboratory for Sensors, IMTEK - Department of Microsystems Engineering, University of Freiburg, Freiburg, Germany
Deschner, Benedikt J. ; Institute for Micro Process Engineering (IMVT), Karlsruhe Institute of Technology, Germany
Kraut, Manfred ; Institute for Micro Process Engineering (IMVT), Karlsruhe Institute of Technology, Germany
LADEWIG, Bradley Paul ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Engineering (DoE) ; Institute for Micro Process Engineering (IMVT), Karlsruhe Institute of Technology, Germany
Weltin, Andreas ; Laboratory for Sensors, IMTEK - Department of Microsystems Engineering, University of Freiburg, Freiburg, Germany
Kieninger, Jochen ; Laboratory for Sensors, IMTEK - Department of Microsystems Engineering, University of Freiburg, Freiburg, Germany
Dittmeyer, Roland ; Institute for Micro Process Engineering (IMVT), Karlsruhe Institute of Technology, Germany ; Institute of Catalysis Research and Technology (IKFT), Karlsruhe Institute of Technology, Germany
External co-authors :
yes
Language :
English
Title :
Investigation of mass transport processes in a microstructured membrane reactor for the direct synthesis of hydrogen peroxide
This work was performed with the help of the Large Scale Data Facility at the Karlsruhe Institute of Technology funded by the Ministry of Science, Research and the Arts Baden-Württemberg and by the Federal Ministry of Education and Research. The authors would like to thank Uta Gerhards and Florian Messerschmidt (KIT, IMVT-MAT) for SEM studies and Paul Kant for support with the gas chromatograph.This work was performed with the help of the Large Scale Data Facility at the Karlsruhe Institute of Technology funded by the Ministry of Science, Research and the Arts Baden-Württemberg and by the Federal Ministry of Education and Research. The authors would like to thank Uta Gerhards and Florian Messerschmidt (KIT, IMVT-MAT) for SEM studies and Paul Kant for support with the gas chromatograph.This research was funded by Deutsche Forschungsgemeinschaft (DFG) (FOR 2383, under Grant No. DI 696/13-2).
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