Spray Drying or atomization is a technique that transforms liquid solutions into dry powders. The drying technique by spray drying has been widely applied in the production of dry extracts with better technological features and higher content of active substances. The process consists of atomization of the fluid solution on a drying chamber on which the droplets go through a warm air flow. The heat and mass transference during the drying process occurs in a very fast way between the air and steam films which stay around each droplet under saturation temperature. This technique, subsequently, is appropriate for heat sensitive products, preserving its essential features.
This type of drying procedure is widely used in the food industry, is common for the production of powder milk, instant coffee and powder juices and in the production of active components in the pharmaceutical and phytotherapic industries. Spray drying is ideal for cases where the final product should respect a high specific and reproducible pattern of quality regarding the particles sizes, morphology, percentage of residual moisture, density and other parameters.