Process and device for determining the end of a primary stage of

Details Process and device for determining the end of a primary stage of Process and device for determining the end of a primary stage of

1987-11-30

1988-11-01

Warner, Steven E.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

34 15, 34 44, 34 53, 34 92, F26B 506

Patent

active

047809647

ABSTRACT:
A tray-type freeze drying device determines the end of a first stage of a freeze drying process by regularly and drastically reducing the pressure surrounding the product being freeze dried. No decrease in product temperature during the reduction in pressure indicates the completion of the sublimation of water from the product and the end of the first stage of drying. A decrease in product temperature during the drastic reduction in pressure indicates the need to continue the sublimation procedure and the first stage of drying.

REFERENCES:
patent: 3178829 (1965-04-01), Cox
patent: 3192643 (1965-07-01), Rieutord
patent: 3233333 (1966-02-01), Oppenheimer
patent: 3259991 (1966-07-01), Illich, Jr.
patent: 3262212 (1966-07-01), Buhr
patent: 3352024 (1967-11-01), Mellor
patent: 4547977 (1985-10-01), Tenedini et al.
patent: 4597188 (1986-07-01), Trappler

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