Spray Drying as an Appropriate Technology for the Food and Pharmaceutical Industries - A Review (original) (raw)

Spray drying is a method used to produce dry powder from a liquid or slurry by rapidly drying with a hot gas and it is mostly used in the food and pharmaceutical industries. This paper covers the parameters of spray dryer, principles of spray dryer, basics of spray drying, dryer configuration, collection of dried powder, and flow of drying gas, process design and control. Spray dryers can dry a product very quickly compared to other methods of drying. They also turn a solution or slurry into a dried powder in a single step, which can be advantageous for profit maximization and process simplification. Spray dryers employ atomizer or spray nozzle to disperse the liquid or slurry into a controlled drop size spray. The commonest of these are rotary disks and single-fluid high pressure swirl nozzles. Spray drying offers multiple opportunities that no other single drying technology can claim. Besides spray drying offers unique opportunities in particle size engineering.