Collaborative Research Center/Transregio 63
"Integrated Chemical Processes in Liquid Multiphase Systems"
Sub-Coordinator: Prof. Dr.-Ing. Matthias Kraume
Researcher: Dipl.-Ing. Marc Petzold
The yield and the selectivity of reactions in micellar systems are governed by the mass transfer, which can be derived from the results given in figure 1. Here, the reaction rate of the hydroformylation of 1-dodecene is shown as a function of the stirrer speed. With increasing stirrer speed the reaction accelerates. This can be referred to a higher specific interface respectively to an improved mass transfer. Nevertheless, the mass transfer resistance in micellar systems is increased . Furthermore, an additional phase (microemulsion) occurs. To understand the interaction of mass transfer and reaction rate micellar systems important knowledge about the transport processes and interfacial phenomena are missing.
Gaining a basic physical understanding of the transport processes in micellar three phase systems and pickering emulsions is the main goal of this subproject. Therefore, the phase conditions as well as the interfacial phenomena must be quantified in detail. The investigations concerning the mass transfer shall be carried out at single droplets and in droplet swarms. Furthermore, the interaction between reaction rate and mass transfer will be investigated to design a macro-kinetic model, which is needed to predict reactions in micellar systems and pickering emulsions.
 Paul, N., Schrader, P., Enders, S., Kraume, M.: Effects of phase behaviour on mass transfer in micellar liquid/liquid systems, Chemical Engineering Science, 2013
 Hamerla, T., Paul, N., Kraume, M., Schomäcker, R.: Mass Transfer Phenomena in Micellar Multiphase Systems Investigated for a Hydroformylation Reaction, Chemie Ingenieur Technik 2013, 85, No. 10, 1530-1539.
Petzold, M.; Rohl, S.; Hohl, L.; Stehl, D.; Lehmann, M.; von Klitzing, R.; Kraume, M. Mass Transfer and Drop Size Distributions in Reactive Nanoparticle-Stabilized Multiphase Systems. Chem. Ing. Tech., 89(11), 1561-1573, 2017. [doi: 10.1002/cite.201700060]
Hohl, L.; Paul, N.; Kraume, M. Dispersion conditions and drop size distributions in stirred micellar multiphase systems. Chem. Eng. Process., 99, 149-154, 2016. [doi:10.1016/j.cep.2015.08.011]
Hohl, L.; Schulz, J.; Paul, N.; Kraume, M. Analysis of physical properties, dispersion conditions and drop size distributions in complex liquid/liquid systems. Chem. Eng. Res. Des., 108, 210-216, 2016. [doi:10.1016/j.cherd.2016.01.010]
Paul, N.; Schulz, J. M.; Kraume, M. Determination of phase separation and mass transfer in complex micellar three phase systems. Chem. Eng. Process., 99, 143-148, 2016. [doi:10.1016/j.cep.2015.07.010]
Paul, N.; Kraume, M.; Schön, S.; von Klitzing, R. Transport processes at single droplets in micellar liquid/liquid systems. AIChE J., 61(3), 1092–1104, 2015. [doi: 10.1002/aic.14699]
Paul, N.; Schulz, J. M.; Kraume, M. Fluid Dynamics of Droplets as a Useful Tool to Determine Coverage and Adsorption Kinetics of Surfactants. Chem. Eng. Technol., 38(11), 1979–1984, 2015. [doi:10.1002/ceat.201500137]
Pogrzeba, T.; Müller, D.; Hamerla, T.; Esche, E.; Paul, N.; Wozny, G.; Schomäcker, R. Rhodium-Catalyzed Hydroformylation of Long-Chain Olefins in Aqueous Multiphase Systems in a Continuously Operated Miniplant. Ind. Eng. Chem. Res., 54(48), 11953-11960, 2015. [doi:10.1021/acs.iecr.5b01596]
Paul, N.Theoretische und experimentelle Untersuchungen von Transport- und Grenzflächenphänomenen in mizellaren Flüssig/flüssig-Systemen. Technische Universität Berlin, 2014.