Refrigeration – Processes – Circulating external gas
Patent
1990-11-14
1992-01-14
Capossela, Ronald C.
Refrigeration
Processes
Circulating external gas
62 24, F25J 304
Patent
active
050799231
ABSTRACT:
The invention is concerned with a process of the type in which the air to be treated, from which water and CO.sub.2 have been removed and which has been cooled at about its dew point, is injected at the base of the mean pressure column of the double column. A first fraction of rich liquid, withdrawn from the bottom of the mean pressure column is expanded and sent into a head condenser of a column for the production of impure argon connected to the low pressure column of the double column. A second fraction of rich liquid, withdrawn from the lower portion of the mean pressure column, is expanded and sent as reflux into the low pressure column. According to the invention, a second fraction of rich liquid is withdrawn from an intermediate point of the mean pressure column and a residual gas from the apparatus is formed from at least a portion of the rich liquid withdrawn from the bottom of the mean pressure column. The apparatus which is used to carry out this process enables to withdraw the second fraction of rich liquid from an intermediate point of the mean pressure column and comprises auxiliary devices to constitute a residual gas of the apparatus from at least a portion of the rich liquid which is withdrawn from the bottom of the mean pressure column.
REFERENCES:
patent: 3447331 (1969-06-01), Smith
patent: 3596471 (1971-08-01), Streich
patent: 4783208 (1988-11-01), Rathbone
patent: 4790866 (1988-12-01), Rathbone
patent: 4871382 (1989-10-01), Thorogood et al.
patent: 4916908 (1990-04-01), Lavin et al.
Capossela Ronald C.
L'Air Liquide Societe Anonyme pour l'Etude et, l'Exploitation de
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