Method and apparatus for controlling freeze drying process

Details Method and apparatus for controlling freeze drying process Method and apparatus for controlling freeze drying process

1996-09-06

1998-04-28

Bennett, Henry A.

Drying and gas or vapor contact with solids

Process

Freeze-drying

34538, 34570, 34 92, 34527, 34417, F26B 1310

Patent

active

057430233

ABSTRACT:
Control of temperature of the shelves in a freeze dryer compartment is achieved by circulating a cooled heat transfer fluid from a heat exchanger through a vacuum condenser independently of circulating the cooled heat transfer fluid either directly through the passageway chambers in the freeze dryer shelves, for cooling the shelves, or through a heater for heating the shelves. These circulations are effected by the selective control of electrically operated valves in fluid conduits automatically by a programmed computer.

REFERENCES:
patent: 3795986 (1974-03-01), Sutherland et al.
patent: 4016657 (1977-04-01), Passey
patent: 4081914 (1978-04-01), Rautenbach et al.
patent: 4547977 (1985-10-01), Tenedini et al.
patent: 5456084 (1995-10-01), Lee
patent: 5519946 (1996-05-01), Renzi

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