Spray Dryer

Spray drying is a suspended particle processing (SPP) technique that utilizes liquid atomization to create droplets that are dried to individual particles when moved in a hot gaseous drying medium, usually air. It is a one-step continuous unit processing operation.

Over 25,000 spray dryers are now estimated to be commercially in use to dry products from agrochemical, biotechnology products, fine and heavy chemicals, dairy products, dyestuffs, mineral concentrates to pharmaceuticals in capacities ranging from a few kg/h to over 50 tons/h evaporation capacity.

The advantages of spray dryers are that this technique can handle heat sensitive, non-heat-sensitive, and heat-resistant pump able fluids as feedstock from which a powder is produced. Produce dry material of controllable particle size, shape, form, moisture content, and other specific properties irrespective of dryer capacity and heat sensitivity. Provide continuous operation adaptable to both conventional and PLC control. Handle wide range of production rates, i.e., any individual capacity requirement can be designed by spray dryers. Provide extensive flexibility in spray dryer design, such as drying of organic solvent-based feedstock without explosion and fire risk; drying of aqueous feedstock (where the resulting powders exhibit potentially explosive properties as a powder cloud in air); drying of toxic materials; drying of feedstock that require handling in aseptic and hygienic drying conditions; drying of liquid feedstock to granular, agglomerated, and non-agglomerated products