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Freeze drying apparatus

United States Patent

November 6, 2001
View the Complete Patent at the US Patent & Trademark Office
Los Alamos National Laboratory - Visit the Technology Transfer Division Website
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.
Coppa; Nicholas V. (Malvern, PA), Stewart; Paul (Youngstown, NY), Renzi; Ernesto (Youngstown, NY)
The BOC Group, Inc. (Murray Hill, NJ)
09/ 255,581
February 22, 1999
This invention was made with Government support under Contract No. W-7405ENG-36 awarded by the U.S. Department of Energy. The Government has certain rights in the invention.