Process and apparatus for low-temperature separation of air

Details Process and apparatus for low-temperature separation of air Process and apparatus for low-temperature separation of air

1996-11-21

1998-09-29

Capossela, Ronald C.

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62647, F25J 300

Patent

active

058132511

ABSTRACT:
The process and the apparatus are used for low-temperature separation of air in a rectifying column system that has a preliminary separation column (10) and a low-pressure column (20). Feed air (1, 3) is introduced (4, 6, 7, 8, 41) into preliminary separation column (10) and is separated into a nitrogen-enriched overhead fraction and an oxygen-enriched bottom fraction. At least a portion (19) of the oxygen-enriched bottom fraction is introduced into the low-pressure column (20), in which liquid oxygen and gaseous nitrogen are produced. The pressure in preliminary separation column (10) is essentially equal to the pressure of low-pressure column (20). The reflux for the columns can be obtained by one or two cyclic processes operated with overhead gas (11, 23) from one or two columns (10, 20).

REFERENCES:
patent: 4507134 (1985-03-01), Tomisaka et al.
patent: 4704148 (1987-11-01), Kleinberg
patent: 4964901 (1990-10-01), Rhode
patent: 5590544 (1997-01-01), Corduan et al.

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