Refrigeration – Cryogenic treatment of gas or gas mixture – Separation of gas mixture
Patent
1995-02-23
1997-01-07
Capossela, Ronald C.
Refrigeration
Cryogenic treatment of gas or gas mixture
Separation of gas mixture
62924, F25J 300
Patent
active
055905447
ABSTRACT:
A process and apparatus for recovery of pure argon from air utilize a rectification system comprising 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 the 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 liquid from a pressure column (8).
REFERENCES:
patent: 4935044 (1990-06-01), Schoenpflug
patent: 5019145 (1991-05-01), Rohde et al.
patent: 5282365 (1994-02-01), Victor et al.
patent: 5305611 (1994-04-01), Howard
Patent Abstracts of Japan, vol. 17, No. 517 (M-1481) (Sep. 17, 1993).
Corduan Horst
Rohde Wilhelm
Capossela Ronald C.
Linde Aktiengesellschaft
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