Freeze drying method

Details Freeze drying method Freeze drying method

1996-09-19

1999-12-07

Bennett, Henry

Drying and gas or vapor contact with solids

Process

With sealing of treating chamber

34289, F26B 504

Patent

active

059962488

ABSTRACT:
The present invention provides methods and apparatus for freeze drying in which a solution, which can be a radioactive salt dissolved within an acid, is frozen into a solid on vertical plates provided within a freeze drying chamber. The solid is sublimated into vapor and condensed in a cold condenser positioned above the freeze drying chamber and connected thereto by a conduit. The vertical positioning of the cold condenser relative to the freeze dryer helps to help prevent substances such as radioactive materials separated from the solution from contaminating the cold condenser. Additionally, the system can be charged with an inert gas to produce a down rush of gas into the freeze drying chamber to also help prevent such substances from contaminating the cold condenser.

REFERENCES:
patent: 3255534 (1966-06-01), Kan
patent: 3381746 (1968-05-01), Weigmann et al.
patent: 4081914 (1978-04-01), Rautenbach et al.
patent: 4597188 (1986-07-01), Trappler
patent: 4802286 (1989-02-01), Kobayashi et al.
patent: 5743023 (1998-04-01), Fay et al.

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