Vergleich chromatographischer Reaktorkonzepte

Comparison of Chromatographic Reactor Concepts The integration of a chemical or biochemical reaction and a chromatographic separation in a single apparatus offers the opportunity to overcome chemical equilibrium as well as an increase in the separation efficiency. The different possibilities to design such a chromatographic reactor are discussed. Due to the complex behaviour modelling and simulation are powerful tools for process development and design. Therefore an overview over the different modelling approaches is given. Applying the example of the glucose isomerisation, the different processes based on the chromatographic simulated moving bed (SMB) reactor are compared. Different purity restrictions of the produced fructose syrup lead to different degrees of integration of reaction and separation in respect to a favourable process design.     

Hochselektive Stofftrennungen mit Carriermembranen — Stand der Entwicklung und Erwartungen

Membrane processes are able to separate liquid mixtures as well as mixtures of gases or vapours according to the sizes, solubilities, rates of diffusion or charges of the components. A separation is also possible using membranes in which the transport is coupled to a specific chemical reaction between the permeand and the membrane (facilitated or carrier mediated transport). This paper discusses aspects related to carrier‐mediated separation processes such as the transport mechanisms, the choice of appropriate carriers, the incorporation of carriers in the polymeric membrane material, the coating of porous support membranes with thin selective layers of the carrier‐polymer and, finally, the choice of appropriate parameters for the separation process. The separation of gas mixtures by carrier‐membranes appears very promising from a technical point of view. Experimental membrane samples often show excellent separation factors, but they have not met the permeability requirements for an economic use so far.     

Separation Units 4.0 – Trenntechnik in der chemischen Industrie auf dem Weg in die digitale Zukunft. Eindrücke und erste Ergebnisse vom Tutzing-Symposion 2019

In October 2019 the ProcessNet Section „Fluid Dynamics and Separation” invited experts from academia and industry to discuss the status and future developments in the field. In contrast to earlier events considering a whole plant the focus was complementary on apparatus level. In five clusters within several workshops decision makers evaluated opportunities, challenges, and further cross-linking with other branches as a basis for further activities such as white paper, roadmap, etc.     

Selektive Partikelklassierung in ultraschallangeregten Aerosolen

In this contribution an alternative approach to classify finest particles in an aerosol is described. Traditional separation processes reach their limits for smallest particles, as their separation mechanism often arises from the dominance of volumetric forces. An approach that allows the classification of the finest particles in an aerosol is presented and verified by analytical modeling. This alternative separation method provides good selectivity and offers the perspective of processing technically relevant amounts in particle size ranges where only analytical methods are currently available.