* * * INSIGHT * * *

Water Vapor Throughput for A Freeze-Dryer

By

Thomas A. Jennings, Ph.D.

ABSTRACT: The two basic questions that are often asked  are  (1), why during primary drying of  a lyophilization  process does it take so long to dry a product at low  chamber pressures, e.g., 50 mTorr; and (2),  why are there differences in pressure and drying rate during the primary drying  between freeze-dryers while having the same shelf temperatures? The answer to these questions lies in the water vapor throughput  (Q(t))  of the dryers. It is the objective of this INSIGHT to discuss the water vapor throughput of a freeze-dryer.

Volume 1 No. 4                                                                                                  June 1998

5 Pages          2 References          No Figures

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