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1 Department of Chemical and Biochemical Engineering, Technical University of Denmark 2 Center for Process Engineering and Technology, Department of Chemical and Biochemical Engineering, Technical University of Denmark 3 Ghent University 4 Ghent University
Drying is frequently used in the production of pharmaceutical tablets. Simulation-based control strategy development for such a drying process requires a detailed model. First, the drying of wet granules is modelled using a Population Balance Model. A growth term based on a reduced model was used, which describes the decrease of the moisture content, to follow the moisture content distribution for a batch of granules. Secondly, different solution methods for solving the PBM are compared. The effect of grid size (discretization methods) is analyzed in terms of accuracy and calculation time. All tested methods are compared based on their ability to predict moment dynamics and the distribution, and their computational burden. The Method of Characteristics, a fast method, is able to calculate the distribution accurately with a coarse grid. The Quadrature Method of Moments requires even less calculation time, but results in a set of moments. © 2012 Elsevier Ltd.
Computers and Chemical Engineering, 2013, Vol 50, p. 39-53
Discrete event simulation; Drug products; Granulation; Mathematical models; Method of moments; Moisture determination; Drying
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