Freeze-Drying of Pharmaceuticals in Vials on Trays: Effects of Drying Chamber Wall Temperature and Tray Side on Lyophilization Performance
The effects of tray side and drying chamber wall temperature on the performance of freeze-drying of pharmaceuticals in vials arranged in clusters of hexagonal arrays on trays are studied, and the results of this work indicate that it would be beneficial to operate the lyophilization process by (i) employing freeze-dryers whose trays have no tray sides, (ii) using heat input control that runs the freeze-drying process close to the melting and scorch temperature constraints during the primary and secondary drying stages, respectively, and (iii) keeping the drying chamber wall temperature slightly higher than the melting temperature constraint during the primary drying stage, while during the secondary drying stage the drying chamber wall temperature should not be significantly lower than the scorch temperature constraint. The modeling and system formulation approach presented here provide a quantitative method that can be used in the analysis, optimization and control of the lyophilization process, as well as in the design of freeze-dryers.
K. H. Gan et al., "Freeze-Drying of Pharmaceuticals in Vials on Trays: Effects of Drying Chamber Wall Temperature and Tray Side on Lyophilization Performance," International Journal of Heat and Mass Transfer, Elsevier, Jan 2005.
The definitive version is available at http://dx.doi.org/10.1016/j.ijheatmasstransfer.2004.12.004
Chemical and Biochemical Engineering
Keywords and Phrases
Drying Chamber Wall Temperature Control; Drying Chamber Wall Temperature Effect; Freeze Drying of Pharmaceuticals in Vials; Lyophilization of Pharmaceuticals in Vials; Tray Side Effect
Article - Journal
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