Review on Spray Drying Technology

CHEMICAL ENGINEERING

Spray drying is an important unit operation in manufacturing process for powders. It is also a challenging one involving a complex balance between production costs and product quality. Spray drying is the process of contacting an atomized stream to be dried with a gas stream that is at a higher temperature than the liquid stream. The higher temperature of the gas stream causes evaporation of the liquid from the droplets, forming particles. In spite of such a variety of applications, the mechanisms of spray drying to form particles is not completely understood. One of the reasons for this is that the spray drying process, characterized by rapid and simultaneous heat and mass transfer between the droplets of the feed solution and the heating gas, is complex to describe in a mathematical model as many of the model parameters are not readily measurable.

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