Methods Involving Movement of the Solid

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Chapter: Pharmaceutical Engineering: Drying

As an extension of drying by passing the airstream through a static bed of solids, it is possible to project air upward through the bed at a velocity high enough to fluidize the particles.


METHODS INVOLVING MOVEMENT OF THE SOLID

As an extension of drying by passing the airstream through a static bed of solids, it is possible to project air upward through the bed at a velocity high enough to fluidize the particles. Alternatively, the material may be mechanically sub-divided and then introduced into the drying stream. Both methods give high drying rates due to high interfacial contact between the drying surfaces and the airstream. Fluidized bed dryers and spray dryers, respectively, use these principles.

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