Refrigeration – Processes – Circulating external gas
Patent
1989-03-08
1990-04-17
Capossela, Ronald C.
Refrigeration
Processes
Circulating external gas
55 66, 62 24, F25J 304
Patent
active
049169084
ABSTRACT:
A process for the separation of air to obtain oxygen, nitrogen and argon is disclosed which comprises: subjecting air from which carbon dioxide and water have been removed to fractional distillation in a first column to form oxygen-nitrogen vapor and argon-enriched oxygen; separating argon from the latter in a second column operating at substantially lower pressure than the first; liquefying a portion of the nitrogen vapor in a cycle including heat exchange with incoming air and compression to a pressure above that of the first column, a portion of the liquid nitrogen being taken as product and a second portion being returned to the first column as reflux. Liquid-oxygen and nitrogen vapor from the first column are mixed in a liquid-vapor contact column, impure liquid nitrogen is withdrawn therefrom and used as reflux in the first column. A remixed oxygen-nitrogen stream is withdrawn from the contact column and expanded to create refrigeration for the system. Also, disclosed is apparatus for carrying out the subject process.
REFERENCES:
patent: 4137056 (1979-01-01), Golovko
patent: 4338108 (1982-07-01), Isalski et al.
patent: 4575388 (1986-03-01), Okada
patent: 4704148 (1987-11-01), Kleinberg
patent: 4747859 (1988-05-01), Gladman et al.
patent: 4747860 (1988-05-01), Atkinson
patent: 4818262 (1989-04-01), Brugerolle
Lavin John T.
Layland David J.
Capossela Ronald C.
Cassett Larry R.
Nemetz Carol A.
Swope R. Hain
The BOC Group Inc.
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