Andreas Pfennig

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The vast majority of today’s chemical products are based on crude oil. An attractive and sustainable alternative feedstock is biomass. Since crude oil and biomass differ in various properties, new synthesis pathways and processes have to be developed. In order to prioritize limited resources for research and development (R & D), their economic potential(More)
Product isolation from aqueous-organic reaction mixtures that contain high concentrations of whole cells constitutes a challenging task in bioprocessing. Stirring of the biphasic reaction media leads to the formation of solvent droplets coated by cells and other surface active components and an emulsion forms. We used an early focus on phase separation to(More)
Carbon dioxide can be used in various ways as a cheap C1 source. However, the utilization of CO2 requires energy or energy-rich reagents, which leads to further emissions, and therefore, diminishes the CO2-saving potential. Therefore, life cycle assessment (LCA) is required for each process that uses CO2 to provide valid data for CO2 savings. Carbon dioxide(More)
The simulation of liquid-liquid extraction columns has been of high interest for the last four decades. The well-known procedure is to solve drop-population balances. This approach reaches its limits if the additional influences like reactions shall be included in the simulation and can be solved only with extremely high mathematical effort. ReDrop(More)
Thermodynamic modeling of extensive systems usually implicitly assumes the additivity of entropy. Furthermore, if this modeling is based on the concept of Shannon entropy, additivity of the latter function must also be guaranteed. In this case, the constituents of a thermodynamic system are treated as subsystems of a compound system, and the Shannon entropy(More)
The efficiency of column internals for the distillation of aqueous systems is the result of the very complex interdependence of variations in the physicochemical properties due to concentration profiles and other factors like the internals geometry and the operating conditions. In this work we set out to derive a procedure which is able to account for these(More)
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