Refrigeration – Processes – Circulating external gas
Patent
1994-03-17
1995-05-09
Capossela, Ronald C.
Refrigeration
Processes
Circulating external gas
62 38, 62 41, F25J 302
Patent
active
054129532
ABSTRACT:
Process and installation for the production of gaseous oxygen and/or gaseous nitrogen under pressure, of the type in which air is distilled in a double distillation column (11) comprising a low pressure column (13) operating under a so-called low pressure, and a medium pressure column (12) operating under a so-called medium pressure. All the air to be distilled is compressed (in 1, 3, 7)to at least one high air pressure substantially greater than the medium pressure, and the compressed air is cooled to an intermediate temperature, and a portion of it is expanded in a turbine (8) to the medium pressure, before introducing it into the medium pressure column (12). The air which has not been expanded is liquefied, then introduced after expansion (in 20, 21), into the double column. At least one liquid product withdrawn from the double column is brought to the production pressure, and this liquid product is vaporized by heat exchange with at least one portion of the air to be distilled in the course of cooling. An additional cycle fluid withdrawn from the double column (11) or destined for this latter, is reheated, compressed (in 3; 30, 31) to a high cycle pressure, cooled, a fraction thereof expanded (in 8; 35) with the production of external work, and the rest of the compressed additional cycle fluid is liquefied.
REFERENCES:
patent: 4853015 (1989-08-01), Yoshino
patent: 5251449 (1993-10-01), Rottmann
patent: 5329776 (1994-07-01), Grenier
patent: 5337571 (1994-08-01), Ducrocq et al.
patent: 5341647 (1994-08-01), Koeberle et al.
Darredeau Bernard
Fraysse Philippe
Garnier Catherine
Guillard Alain
Lehman Jean-Yves
Capossela Ronald C.
L'Air Liquide Societe Anonyme pour l'Etude et, l'Exploitation de
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