Freeze drying apparatus with additional condensation surface and

Details Freeze drying apparatus with additional condensation surface and Freeze drying apparatus with additional condensation surface and

1988-07-29

1990-08-21

Bennet, Henry A.

Drying and gas or vapor contact with solids

Apparatus

Vacuum

34 5, 62332, F26B 1330

Patent

active

049494732

ABSTRACT:
A freeze drying apparatus includes a vacuum chamber, an evacuation system, and an additional condensation surface which may serve as a fail-safe condensation surface. The additional condensation surface is connected by way of a valve with a reservoir container containing a low boiling point coolant, such as liquid nitrogen. If, due to a malfunction, the pumping power of the evacuation system fails, the valve is opened so that the additional condensation surface takes over the pumping work for the commodity charge positioned in the vacuum chamber. The additional condensation surface may be positioned in a condenser of the evacuation system, in the vacuum chamber, or in a separate chamber connected to the vacuum chamber.

REFERENCES:
patent: 2453033 (1948-11-01), Patterson
patent: 3191395 (1965-06-01), Maher et al.
patent: 3230633 (1966-01-01), Hamilton
patent: 3385073 (1968-05-01), Snelling
patent: 3648379 (1972-03-01), Mercer et al.
patent: 4060400 (1977-11-01), Williams

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