Autor(en): Wesholowski, Jens
Berghaus, Andreas
Thommes, Markus
Titel: Investigations concerning the residence time distribution of twin-screw-extrusion processes as indicator for inherent mixing
Zusammenfassung: Over recent years Twin-Screw-Extrusion (TSE) has been established as a platform technology for pharmaceutical manufacturing. Compared to other continuous operation, one of the major benefits of this method is the combination of several unit operations within one apparatus. Several of these are linked to the Residence Time Distribution (RTD), which is typically expressed by the residence time density function. One relevant aspect for pharmaceutical processes is the mixing capacity, which is represented by the width of this distribution. In the frame of this study the influence of the mass flow, the temperature and the screw-barrel clearance were investigated for a constant barrel load (specific feed load, SFL). While the total mass flow as well as the external screw diameter affected the mixing performance, the barrel temperature had no influence for the investigated range. The determined results were additionally evaluated with respect to a fit to the Twin-Dispersion-Model (TDM). This model is based on the superimposition of two mixing functions. The correlations between varied process parameters and the obtained characteristic model parameters proved this general physical view on extrusion.
Schlagwörter: modeling
process control
residence time
twin-dispersion-model
twin-screw-extrusion
Schlagwörter (RSWK): Doppelschneckenextruder
Modellierung
Pharmazeutische Technologie
URI: http://hdl.handle.net/2003/38391
http://dx.doi.org/10.17877/DE290R-20323
Erscheinungsdatum: 2018-10-26
Enthalten in den Sammlungen:Lehrstuhl Feststoffverfahrenstechnik

Dateien zu dieser Ressource:
Datei Beschreibung GrößeFormat 
pharmaceutics-10-00207.pdf1.25 MBAdobe PDFÖffnen/Anzeigen


Diese Ressource ist urheberrechtlich geschützt.



Diese Ressource ist urheberrechtlich geschützt. rightsstatements.org