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Comment PDF Separation Processes

A Primer on Spray Drying

By Jens Thousig Møller and Søren Fredsted GEA Niro |

This photo shows a spray dryer with a heat recuperator. The plant has an evaporative capacity of 1,825 kg/h Spray drying is one of the major industrial drying technologies. It is applied by many industries because of its ability to convert a liquid product into a dried powder in a lenient single step and because it allows you to control temperature and the particle formation process very accurately. Altering the process parameters allows you to produce complex powders that meet exact powder properties in terms of particle size and shape, bulk density, dispersibility, polymorphism, flow properties and so on, in a very efficient manner. Spray drying is applied in the production of an endless number of products in the chemical process industries (CPI) ranging from advanced chemical compounds to bulk chemicals. Spray drying plants can be designed for almost any capacity from very small quantities up to several metric tons (m.t.) per hour. Figure 1. This product drying curve shows that two stages typically occur: a constant rate period followed by diffusion-controlled period Historical development Spray drying of liquid products commenced at the end of 19th century with the first patents issued for drying of egg products. In the 1920s,…
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