Air separation with medium pressure enrichment
Triple column cryogenic rectification system
Triple column distillation system for oxygen and pressurized nitrogen production
Three column cryogenic cycle for the production of impure oxygen and pure nitrogen
Triple-column for the low-temperature separation of air
Multiple column nitrogen generators with oxygen coproduction Patent #: 5934104
ApplicationNo. 102010 filed on 03/21/2002
US Classes:62/646, Spaced initial charging62/900TRIPLE COLUMN
ExaminersPrimary: Capossela, Ronald C.
Attorney, Agent or Firm
Foreign Patent References
International ClassF25J 003/00
Foreign Application Priority Data2001-03-21 DE
AbstractThe process and the apparatus are used to obtain argon using a three-column system for the fractionation of air, which has a high-pressure column (11), a low-pressure column (13) and a medium-pressure column (12). A first charge air stream (10, 64) is introduced into the high-pressure column (11), where it is separated into a first oxygen-enriched liquid and a first nitrogen top gas. A first oxygen-enriched fraction (23, 24, 26) from the high-pressure column (11) is introduced into the medium-pressure column (12), where it is separated into a second oxygen-enriched liquid and a second nitrogen top gas. A second oxygen-enriched fraction (33, 35), from the high-pressure column and/or from the medium-pressure column (12), is introduced into the low-pressure column (13), where it is separated into a third oxygen-enriched liquid and a third nitrogen top gas. An argon-containing fraction (68) from the low-pressure column (13) is introduced into a crude argon column (70), where it is separated into a crude argon top fraction and an oxygen-rich liquid. At least a part (73) of the crude argon top fraction (71) is passed into a crude argon condenser (29), where it is at least partially condensed by indirect heat exchange with at least a part (27) of the second oxygen-enriched liquid from the medium-pressure column (12). Oxygen-enriched vapour (32) which is formed in the process is returned to the medium-pressure column (12). A fraction (72) from the upper region of the crude argon column (70) and/or a part of the crude argon top fraction downstream of the crude argon condenser is obtained as crude argon product.