Spray drying is a method of producing a dry powder from a liquid by rapidly drying with a hot gas. This is the preferred method of drying of many thermally sensitive food products, like milk powder, proteins, vitamins, nutraceutical etc, A fine powder is produced with a spray dryer but it can have a poor product flow.
Instead of drying the liquid in one stage, drying is done through two steps: the first step is the spray dryer. In the second step drying of the powder is finalised on an external Tema Proces shaking fluidised bed. Besides the drying, the fluidised bed is also used to cool down the product.