Refrigeration – Processes – Fractionally solidifying a constituent and separating the same
Reexamination Certificate
2006-05-11
2009-10-06
Doerrler, William C (Department: 3744)
Refrigeration
Processes
Fractionally solidifying a constituent and separating the same
C062S617000, C062S637000, C128S204160, C128S205120
Reexamination Certificate
active
07596965
ABSTRACT:
A method and system for the fractionation and removal of nitrous oxide and other volatile halocarbon gas components from waste anesthetic gases using liquid oxygen are disclosed. Liquid oxygen is warmed for use in a healthcare facility by cooling and condensing waste anesthetic gases. A cold trap/fractionator is provided wherein selective components of the waste anesthetic gas are collected as a frost on the coils of the cold trap/fractionator by desublimation/deposition and/or condensation/solidification. In a periodic batch process, the collected frost is first thawed and the melted liquids or gases are then collected at various increasing temperatures, thereby separating the nitrous oxide and other halocarbon gas components by their varying melting points. The thawed anesthetic components are collected in separate tanks based on their melting points. Warmed by the waste anesthetic gases in the cold trap/fractionator, the oxygen is supplied to the healthcare facility for its normal uses.
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Berry James M.
Morris Steve
Andrews & Kurth LLP
Anesthetic Gas Reclamation, LLC
Bush Gary L.
Doerrler William C
Shelley II Mark D.
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