Cryogenic gas purification process and apparatus

Details Cryogenic gas purification process and apparatus Cryogenic gas purification process and apparatus

1989-09-15

1990-06-19

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 42, 62 44, F25J 302

Patent

active

049341472

ABSTRACT:
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 provided with a top column condenser and a bottom column reboiler. The impure gas 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 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 The first vapor fraction is withdrawn and introduced into a second distillation column provided with a top column condenser and a bottom column reboiler. 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vapor fraction containing low boiling point impurities and a second liquid fraction free of trace impurities which is withdrawn as product.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 and liquids obtained from storage.

REFERENCES:
patent: 4560397 (1985-12-01), Cheung
patent: 4711651 (1987-11-01), Sharma et al.

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