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Your search keyword '"Christof Hamel"' showing total 4 results
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4 results on '"Christof Hamel"'

2. Analysis and experimental demonstration of forced periodic operation of an adiabatic stirred tank reactor: Simultaneous modulation of inlet concentration and total flow-rate

Author

Felischak, Matthias, Lothar, Kaps, Christof, Hamel, Nikolić, Daliborka, Petkovska, Menka, Seidel-Morgenstern, Andreas, Felischak, Matthias, Lothar, Kaps, Christof, Hamel, Nikolić, Daliborka, Petkovska, Menka, and Seidel-Morgenstern, Andreas

Abstract

It is well known, that forced periodic operation possesses the potential for process improvements. Nevertheless, only a small number of applications is reported, due to complex realization, limited predictability and high inertia of larger units. Nonlinear frequency response (NFR) analysis has proven to predict efficiently time-averaged performance of reactor effluent streams originating from forced periodic changes of one or several input(s). Focus of this paper was an experimental demonstration of forced periodic operation applied to the hydrolysis of acetic anhydride carried out in an adiabatic CSTR. Theoretical results provided a guideline for experiments exploiting simultaneous sinusoidal modulations of the anhydride inlet concentration and the total volumetric flow-rate. Influences of the forcing parameters (amplitudes and the phase difference) were also studied. Confirming the predictions of NFR analysis a significantly higher time-averaged product yields were experimentally achieved compared to conventional steady-state operation with simultaneous modulation of two inputs using an optimized phase shift.

Published
2021

3. Corrigendum to 'Analysis and experimental demonstration of forced periodic operation of an adiabatic stirred tank reactor: Simultaneous modulation of inlet concentration and total flow-rate' [Chem. Eng. J. 410 (2021) 128197]

Author

Andreas Seidel-Morgenstern, Matthias Felischak, Menka Petkovska, Lothar Kaps, Daliborka Nikolic, and Christof Hamel

Subjects
geography, geography.geographical_feature_category, Materials science, Total flow, Modulation, General Chemical Engineering, Environmental Chemistry, Continuous stirred-tank reactor, General Chemistry, Mechanics, Adiabatic process, Inlet, Industrial and Manufacturing Engineering
Published
2022
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4. Hydroformylation and tandem isomerization–hydroformylation of n-decenes using a rhodium-BiPhePhos catalyst: Kinetic modeling, reaction network analysis and optimal reaction control

Author

Andreas J. Vorholt, Tom Gaide, Andreas Jörke, Christof Hamel, Arno Behr, and Andreas Seidel-Morgenstern

Subjects
chemistry.chemical_classification, Tandem, 010405 organic chemistry, Chemistry, General Chemical Engineering, Side reaction, General Chemistry, 010402 general chemistry, Undecanal, 01 natural sciences, Aldehyde, Industrial and Manufacturing Engineering, 0104 chemical sciences, Catalysis, chemistry.chemical_compound, Cascade reaction, Computational chemistry, Environmental Chemistry, Organic chemistry, Isomerization, Hydroformylation
Abstract

The rhodium-BiPhePhos catalyzed hydroformylation of n-decenes, as representative long-chain olefins, was investigated in this study experimentally and theoretically. Besides hydroformylation activity, the used catalyst enables significant double bond isomerization which is an essential side reaction. Because of this property, highly selective tandem isomerization–hydroformylation reactions that convert mixtures of n-decenes with internal double bond position to the desired terminal aldehyde undecanal are possible using the Rh-BiPhePhos catalyst. Experimentally, a reaction network analysis strategy was applied to study the coupled main and side reactions separately. Subsequently, a mechanistic kinetic model based on an extended Wilkinson-mechanism was developed that includes all relevant main and side reactions. Fitting the model to the 23 well planned experiments was possible with low deviations between model and experiment, including the tandem reaction. It was found that the tandem reaction shows completely opposite dependencies regarding temperature and synthesis gas pressure compared to the conventional hydroformylation of 1-decene, which is also covered by the model. Hence, strategies for optimal reaction performance of the (tandem isomerization-) hydroformylation were developed and presented.

Published
2017
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