Synthese von porösen Kohlenstoffmonolithen unter Verwendung von Porenbeton als Templat

Porous carbon monoliths have been prepared by template assisted routes using porous concrete as the template. Due to its good workability, porous concrete is a suitable template to produce carbon monoliths with defined shape. The pore widths of the obtained monoliths are distributed over a broad range from the micropore to the macropore region. Such materials are a promising base for developing construction components which can be applied in adsorption devices or catalytic systems.     

Strömungen durch monodisperse Kugelschüttungen bei Berücksichtigung des Wandeffekts

The influence of the wall effect on the liquid flow through a porous bed of spheres in a planar casing is investigated. The porosity in the wall‐effect region is determined experimentally. Further experiments lead to a suitable model for the permeability in the wall‐effect region. Functions are determined correcting the volumetric flow rate and the permeability depending on the wall effect.     

Druckverlustberechnung an konzentrischen porösen Hohlzylinderfiltern anhand dimensionsanalytischer Folgerungen und experimenteller Daten

In practice many geometric shapes of filter mediums are possible which differ from the classical case cross‐flow filtration with hollow fiber membranes. In this paper the influence of the filter medium geometry on the filter medium pressure loss due to porous hollow cylindrical tube with inflow from outside was investigated. An increase in resistance of the filter medium as a function of layer thickness and average curvature was observed. Based on dimensional analyses the obtained data were placed in a meaningful context and an empirical model for the calculation of the pressure loss in curved filter mediums could be derived.     

Synthese von porösen Voll‐ und Core‐Shell‐Glaskugeln zur Trennung von chiralen Anästhetika

For the separation of chiral anesthetic gases suitable support materials for the selectors are necessary. Due to the controlled texture properties porous glass shows a high potential for such applications. In this study porous glass beads with particle diameters of 40 – 400 µm and 2 – 4 mm could be obtained via a special fluidized‐bed reactor and the method of ionotropic gelation. Furthermore, the first core‐shell beads on the basis of porous glasses could be synthesized via the combination of an ion‐exchange induced phase separation and a selective leaching step. The new materials are characterized by a defined mesoporous shell and a non‐porous glass core.     

Rückgewinnung und Enantiomerentrennung chiraler Anästhetika mittels modifizierter poröser Gläser

Porous glass can be widely applied due to favorable chemical and physical properties and the possibility to modify the surface. This work describes the synthesis and optimization of porous glass beads for recovering chiral anesthetics and the separation of the enantiomers. Besides a characterization by nitrogen adsorption and mercury intrusion, the retention behavior of desflurane is investigated in chromatographic experiments with the native support and after immobilization of a chiral selector.