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FAQ > Glossary of Terms > S Series > Spray Drying
 

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Spray Drying
Process by which a material in suspension is converted into droplets that may be coated by a substance, either melted or dissolved in the droplet's media. The action in spray drying is primarily that of evaporation, energy is applied to the droplet forcing evaporation of the media with both energy and mass transfer through the droplet. Examples of this technology include, pharmaceutical tablet granulation, and rapid drying which results in free-flowing powders on a continuous basis. Spray drying process consists of the following steps:
1. Formation of a slurry to be sprayed; this slurry may be a simple concentrated solution or the dispersion of an insoluble material in a solution.
2. Liquid atomization into droplets; this action is critical as the droplet size will dictate the equipment size as well as the final product size. There are four types of atomization devices: air, airless, disk (or rotary) spray, and ultrasonic.
3. Exposure of the droplet to a heated gas flow; this gas (normally air) supplies the energy required to vaporize the solvent. Collection of the dry free-flowing powder or encapsulated liquid or solid.