Drying problems include air pollution by solvents, product degradation and packaging difficulties due to lumping. Extensive evaluation of different types of dryers narrowed to two contenders: a rotary vacuum unit operating at about 28 to 29 in/Hg and a TURBO-DRYER®. Both recovered solvents satisfactorily and produced an acceptable dried product (0.5% or less volatiles). the TURBO-DRYER® operating cost was less because its chilled-water refrigeration system for condensing solvents cost less than 75% of the cost of the direct-expansion' "Freon"system required for the rotary vacuum unit.

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