Cryogenic gas purification process and apparatus
    10.
    发明公开
    Cryogenic gas purification process and apparatus 失效
    燃烧气体。

    公开(公告)号:EP0377354A1

    公开(公告)日:1990-07-11

    申请号:EP89403271.3

    申请日:1989-11-27

    发明人: Eyre, Douglas V.

    IPC分类号: F25J3/08 F25J3/04

    摘要: 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 (20) is introduced into a first distillation column (32) and is substantially at its liquid-gas equilibrium temperature at the pressures within the first distillation column. Here the gas is separated by distillation into a first vapor fraction (100) containing low boiling point impurities and a first liquid fraction (38) containing high boiling point impurities. The first vapor fraction is withdrawn and introduced into a second distillation column (52).The first vapor fraction is substantially at the liquid-gas equilibrium temperature at the pressures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 (94) containing high boiling point impurities and a second liquid fraction (60) free of trace impurities which is withdrawn as product. Cooling for 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.

    摘要翻译: 用于低温低沸点液化气体如氧气和氮气超纯化的方法和装置,其含有微量杂质。 将不纯气体(20)引入第一蒸馏塔(32)中,并且在第一蒸馏塔内的压力下基本上处于液 - 气平衡温度。 这里,通过蒸馏将气体分离成含有低沸点杂质的第一蒸气馏分(100)和含有高沸点杂质的第一液体馏分(38)。 第一蒸气馏分被排出并引入第二蒸馏塔(52)中。第一蒸气馏分在第二蒸馏塔内的压力下基本处于液 - 气平衡温度。 这里,通过蒸馏将蒸气馏分分离成含有高沸点杂质的第二蒸气馏分(94)和作为产物取出的不含微量杂质的第二液体馏分(60)。 通过与低温低沸点气体如氮气,氧气或空气的间接热交换来提供该方法的冷却。 待净化的气体以及热交换气体可以从标准空气分离单元获得,或者可以使用从储存器获得的气体进行该方法。