Refrigeration – Cryogenic treatment of gas or gas mixture – Separation of gas mixture
Patent
1996-10-10
1998-03-24
Kilner, Christopher
Refrigeration
Cryogenic treatment of gas or gas mixture
Separation of gas mixture
62900, 62939, F25J 304
Patent
active
057300046
ABSTRACT:
The process and apparatus are based on a triple-column system, having at least a high-pressure column (7), a medium-pressure column (8) and a low-pressure column (9). Feed air (1) is compressed to a first pressure (2). A first partial stream (101, 103, 104) of the resultant air feed (3) is sent into high-pressure column (7) after it has been compressed to a second pressure (5, 102), which is at least equal to the operating pressure of the high-pressure column (7). A second partial stream (201, 202) of the compressed air feed (3) is fed into the medium-pressure column (8). A third partial stream (301, 303, 304) of the compressed air feed (3) is engine-expanded (305) and then fed (306) into the low-pressure column (9). Fractions (18; 26) from the high-pressure column (7) and the medium-pressure column (8) are introduced at least partially into low-pressure column (19, 20; 28, 29). Nitrogen-enriched top fractions (10; 21) from high-pressure column (7) and medium-pressure column (8) are condensed (11; 22). Resultant condensate (13; 24) is fed (15, 16; 25) into low-pressure column (9) as reflux. The first pressure is thus lower than the operating pressure of medium-pressure column (8), thus the second partial stream of the air feed is compressed from the first pressure to a third pressure (5), which is at least equal to the operating pressure of the medium-pressure column (8), but lower than the second pressure.
REFERENCES:
patent: 4356013 (1982-10-01), Linde et al.
patent: 5069699 (1991-12-01), Agrawal
patent: 5233838 (1993-08-01), Howard
patent: 5331818 (1994-07-01), Rathbone
patent: 5341646 (1994-08-01), Agrawal et al.
patent: 5386692 (1995-02-01), LaForce
patent: 5471843 (1995-12-01), Chretien
patent: 5485729 (1996-01-01), Higgenbotham
patent: 5582031 (1996-12-01), Rathbone
Kilner Christopher
Linde Aktiengesellschaft
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