Method for producing sterile cryogenic liquid

a cryogenic liquid and cryogenic liquid technology, applied in the direction of lighting and heating apparatus, filtration, solidification, etc., can solve the problems of difficult pre-sterilization of the system, complicated piping and valves, etc., and achieve the effect of rapid sterilization with steam
US20110277499A1Inactive Publication Date: 2011-11-17LINDE AG
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
LINDE AG
Publication Date
2011-11-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

A method for producing a sterile cryogenic fluid from a cryogenic gas by sterilizing the cryogenic gas and using a heat exchanger to liquefy the sterile cryogenic stream. The discharge rate of the sterile cryogenic fluid is controlled by sizing the discharge orifice and setting a predetermined pressure of the sterile cryogenic fluid.
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Description

BACKGROUND OF THE INVENTION

[0001] The present invention relates to a method and apparatus for the production of a sterile cryogenic fluid such as liquid nitrogen. The invention employs an improved pressure and flow control arrangement which significantly reduces the complexity of the system and the validation requirements for steam sterilization.

[0002] Earlier methods for the production of sterile cryogenic fluids such as liquid nitrogen have generally used two broad approaches. The first method uses direct liquid filtration (down to about 0.2 micron or less) to remove microbial or other contaminants. The second method also uses filtration to about 0.2 micron or less, but starts by filtering warm gas. This sterile warm gas is then liquefied in an indirect heat exchange process with a suitable low temperature refrigerant. This low temperature refrigerant is generally liquid having the same chemical composition as the sterile gas (e.g., nitrogen). In this case it is necessary to maintai...

Claims

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