Process and apparatus for recovery of pure argon

Details Process and apparatus for recovery of pure argon Process and apparatus for recovery of pure argon

C - Chemistry, Metallurgy

01

B

C01B 23/00 (2006.01) F25J 3/02 (2006.01) F25J 3/04 (2006.01)

Patent

CA 2142318

The process and the apparatus save for the recovery of pure argon from air. A rectification system comprises at least one air separating column (9) and a pure argon column (25). An argon-enriched mixture (24) of air gases is introduced into the pure argon column (25) in the lower region of which an essentially nitrogen-free argon product (26) is recovered. The head fraction (28) of the pure argon column (25) is liquefied at least partly by indirect heat exchange (29) using an evaporating cooling medium (11;30). The condensate (28a) formed thereby is returned into the pure argon column. The indirect heat exchange (29) is carried out by means of a cooling medium (11;30) which has an oxygen content of at least 10%. Independently thereof the lower region of the pure argon column (25) is heated by indirect heat exchange (27) by means of a heating medium (11) in a liquid state, for example with sump liquor from a pressure column (8).

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