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SYSTEM AND METHOD FOR RECOVERY OF NON-CONDENSABLE GASES SUCH AS NEON, HELIUM, XENON, AND KRYPTON FROM AN AIR SEPARATION UNIT
SYSTEM AND METHOD FOR RECOVERY OF NON-CONDENSABLE GASES SUCH AS NEON, HELIUM, XENON, AND KRYPTON FROM AN AIR SEPARATION UNIT
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机译:从空气分离装置回收氖气,氦气,氙气和K气等不凝气体的系统和方法
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摘要
A system and method for recovery of rare gases such as neon, helium, xenon, and krypton in an air separation unit is provided. The rare gas recovery system comprises a non-condensable stripping column linked in a heat transfer relationship with a xenon-krypton column via an auxiliary condenser-reboiler. The non-condensable stripping column produces a rare gas containing overhead that is directed to the auxiliary condenser-reboiler where most of the neon is captured in a non-condensable vent stream that is further processed to produce a crude neon vapor stream that contains greater than about 50% mole fraction of neon with the overall neon recovery exceeding 95%. The xenon-krypton column further receives two streams of liquid oxygen from the lower pressure column and the rare gas containing overhead from the non-condensable stripping column and produces a crude xenon and krypton liquid stream and an oxygen-rich overhead.
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