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M.Sc. Vanessa Düphans

M.Sc. Vanessa Düphans Foto von M.Sc. Vanessa Düphans

(+49)231 755-2108


Raum G3-4.12



In the pharmaceutical industry there is a constant demand for new drugs. A major challenge is the bioavailability enhancement of the drug molecules. Here the production of Solid Dispersions on a co-rotating twin screw extruder via Hot-Melt-Extrusion is a promising method. [1]


Twin-Screw-Extrusion offers the advantage that the process combines several unit operations in one apparatus, e.g. mixing, melting and dissolving. The screw has a modular design with for example mixing, conveying and kneading elements. Through the combination of different unit operations the process is difficult to optimize and a challenge regarding the scale up. Computer based simulations are a good possibility to predict critical process parameters like residence time, pressure and temperature. [1] Based on the calculations from Kohlgrüber a 1D model was developed. Important inputs for this model are dimensionless parameters that characterize pressure and power correlations for every screw element. [2]

The aim of this study is to determine these parameters and thus to design the extrusion process through specifically selected screw configurations. For the determination a precise knowledge of the basic operations in an extruder is indispensable.


[1] J. Breitenbach, Melt Extrusion: from process to drug delivery technology, European Journal of Pharmaceutics and Biopharmaceutics, 2002, 54, 107–117

[2] K. Kohlgrüber, Modeling: Possibilities and Limitations, in Co-Rotating Twin Screw Ex-truders: Fundamentals, Technology and Applications (Hrsg: K. Kohlgrüber), Carl Hanser Verlag, München, 2008: 105–120.

Curriculum Vitae

since 2018 PhD at the Laboratory of Solids Process Engineering, TU Dortmund

M.Sc. Chemical Engineering, TU Dortmund
Master thesis: Development of a test facility for the characterization of screw elements for a twin screw extruder


B.Sc. Chemical Engineering, TU Dortmund
Bachelor thesis: Development of a 1-D-model for the extrusion process

Born December 16th, Aschaffenburg (Germany)