Spray drying pathways

Figure 3 Spray drying pathways toward mesoporous particies. (Adapted from Ref. [9].)...

The factors which lengthen the pathway for diffusion not only slow the reaction, but also can lead to the formation of nonequilibrium intermediate phases. As an example, coarse particles of an equimolar mixture of BaC03 and Sn02 will lead to the initial formation of Ba2Sn04 rather than BaSn03. This aspect generally makes chemically prepared mixtures, for example, sol-gel, coprecipitation, and freeze- or spray-dried solution processes, more attractive as synthetic methods. 

This system is designed to clean the freeze-drying chamber and condenser with water for injection. Spraying with WFI at an inlet temperature of (provide value) °C effects cleaning of the chamber. There are jet rods installed in the drying chamber and the pathway to the condenser. The position of these rods as well as the distribution of the spray jets provides good coverage all over the interior surfaces of the chamber with WFI. The jet rods are equipped with full cone and flat jet nozzles. 

The formation of particles via the EISA route, using aerosol spraying followed by drying, in principle follows the same pathway, with solvent evaporation driving micellisation followed by condensation of the inorganic material in the spaces between micelles (Figure The... 

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