Method and device for obtaining nitrogen by low-temperature sepa

Details Method and device for obtaining nitrogen by low-temperature sepa Method and device for obtaining nitrogen by low-temperature sepa

1998-05-15

1999-10-12

Capossela, Ronald

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62652, F25J 300

Patent

active

059641045

ABSTRACT:
In the method and device, nitrogen is obtained by two-stage rectification of air in a double column. Double column contains a high-pressure column and a medium-pressure column that are in a heat-exchange relationship with each other. Entering air is compressed, purified, cooled in a main heat exchanger against separation products, and fed to rectification. At least one nitrogen product fraction is taken from high-pressure column. A nitrogen gas fraction from double column is heated, expanded, and brought into indirect heat exchange with an oxygen-enriched liquid from the lower region of medium-pressure column. In this way, the nitrogen gas fraction is at least partially condensed and the oxygen-enriched liquid is at least partially evaporated. The condensate formed in the indirect heat exchange is at least partially fed to medium-pressure column. The nitrogen gas fraction is heated upstream of expansion to an intermediate temperature that is between the temperatures at the cold end and the warm end of main heat exchanger.

REFERENCES:
patent: 4099945 (1978-07-01), Skolaude
patent: 4299607 (1981-11-01), Okabe
patent: 4617036 (1986-10-01), Suchdeo et al.
patent: 4834785 (1989-05-01), Ayres
patent: 5651271 (1997-07-01), Fraysse
Derwent WPI Abstract of 44 41 920 C1, D. Rottmann, Jul. 11, 1996.
Derwent WPI Abstract of 25 48 222 B, Jan. 27, 1977.
Derwent WPI Abstract of 35 28 374 A, D. Rottmann, Feb. 12, 1987.

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