Through-Circulation Drying

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Chapter: Pharmaceutical Engineering: Drying

If the particles are in a suitable granular form, it is often possible to pass the airstream downward through the bed of solids.


THROUGH-CIRCULATION DRYING

If the particles are in a suitable granular form, it is often possible to pass the airstream downward through the bed of solids. Drying will then follow the pattern described in previous sections except that each particle or agglomerate behaves as a drying bed. The surface area exposed to the drying gases is greatly increased and drying rates 10 to 20 times greater than those encountered when air is passed over a free surface are obtained.

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