A closed cycle dryer recycles the drying gas, which may be air or more commonly, an inert gas such as nitrogen. Closed cycle units are the dryers of choice
when:
• Feedstock consists of solids mixed with flammable organic solvents.
• Complete recovery of solvent is required.
• The products are toxic
• Pollution due to vapor, particulate emissions or odor is not permitted.
• Explosion risks must be eliminated.
• The powder will degrade by oxidation during drying.