F - Mech Eng,Light,Heat,Weapons – 25 – J
Patent
F - Mech Eng,Light,Heat,Weapons
25
J
162/132
F25J 3/02 (2006.01) F25J 3/04 (2006.01) F25J 3/08 (2006.01)
Patent
CA 2003906
ABSTRACT OF THE INVENTION A process and apparatus for the ultrapurification of cryogenic low boiling liquified gases such as oxygen and nitrogen which contain trace impurities. The impure gas is introduced into a first distillation column and is substantially at its liquid-gas equilibrium temperature at the pressure within the first distillation column. Here the gas is separated by distillation into first vapor fraction containing low boiling point impurities and a first liquid fraction containing high boiling point impurities. The first vapor fraction is withdrawn and introduced into a second distillation column. The first vapor fraction is substantially at the liquid-gas equilibrium temperature at the pressures within the second distillation column. Here the vapor fraction is separated by distillation into a second vapor fraction containing high boiling point impurities and a second vapor fraction free of trace impurities which is withdrawn as product. Cooling the process is provided by indirect heat exchange with a cryogenic low boiling gas such as nitrogen, oxygen, or air. The gas to be purified as well as the heat exchange gas can be obtained from a standard air separation unit or the process can be conducted using gases obtained from storage.
Eyre Douglas V.
Liquid Air Engineering Corporation
Swabey Ogilvy Renault
LandOfFree
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