Spray Dryer

Spray drying is a method of producing a dry powder from a liquid or slurry by rapidly drying with a hot gas. This is the preferred method of drying of many thermally-sensitive materials such as foods and pharmaceuticals. Spray Dryer takes a liquid stream and separates the solute or suspension as a solid and the solvent into a vapor. The solid is usually collected in a drum or cyclone. The liquid input stream is sprayed through a nozzle into a hot vapor stream and vaporized. 

Solids form as moisture quickly leaves the droplets. A nozzle is usually used to make the droplets as small as possible.

Applications of Spray Dryers

• Food and Beverages: Production of milk powder, coffee, tea.
• Pharmaceutical: Antibiotics, medical Ingredients.
• Industrial : paints, ceramic materials

Advantage :

• Effective for viscous, fibrous and crystalline products
• High heat transfer rates due to film boiling
• Compact design
• Complete solvent recovery
• Easy for maintenance
• Final product in complete dried form