Normally, hot air is used in the spray drying process; however, if the liquid is flammable then nitrogen gas is used instead to prevent fire hazards.
A spray dryer separates the solute as a solid and the solvent as a vapour and the solid is easily collected in a drum. The liquid is sprayed through a nozzle into a hot vapour stream and gets evaporated. The spray drying process is a continuous operation in which the liquid is converted into a free flowing powder very quickly.
Spray Dryers are available in a range of sizes and these ensure uniform quality, moisture content and particle size distribution. It ensures a good performance at easy rates and can be customized to suit the individual requirements.
Industrial Spray Dryers that can handle tons of raw materials are in use in various industries like pharmaceutical, polymer, ceramics and food among others. There are various types of spray dryers including industrial flash dryers, spray dryers, flash dryer etc to suit the various needs of the customers.
The spray drying technique is extensively used in the manufacture of dry powdered substances like milk powder and instant drink mixes among others. Thermal degradation of products can be avoided by operating the spray dryers at a lower temperature and using larger chamber sizes for increased residence times. The latest innovations have resulted in qualitatively superior spray dryers that can retain the aroma and texture of the products even at high temperatures.
Industrial spray dryers are available in various capacities and energy consumptions.