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Comment Separation Processes

Spray Drying Parameters

By Chemical Engineering |

Among the most widely used technologies in the chemical process industries (CPI), spray drying involves dispersing a liquid or slurry in a hot gas to produce a dry powder product. A wide range of pumpable solutions, suspensions and emulsions can be used as spray-drying feeds. Spray drying allows processors to generate powders with precisely defined properties. By controlling process parameters — including the characteristics of the liquid feed, the method of atomization, the configuration of the dryer and others — chemical makers can control the shape, flow properties and porosity of the solid particles produced. Here, the major considerations of spray drying are outlined.    Figure 1. Rotary atomizers (a) produce a liquid mist horizontally from the atomizer wheel. Atomization by nozzle (b) often leads to a narrower particle-size distribution GEA Niro   Atomization Several methods for atomizing the liquid feed in a spray-drying system are available (Figure 1). For most atomization equipment, the liquid leaves the atomizing head as a thin liquid film. The film fragments upon leaving the atomizing head, and droplets form immediately, driven by the surface…
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