Nitrogen generation method and apparatus

Details Nitrogen generation method and apparatus Nitrogen generation method and apparatus

1995-12-18

1997-03-18

Capossela, Ronald C.

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62912, F25J 300

Patent

active

056112181

ABSTRACT:
A method and apparatus for generating nitrogen from the separation of air in a single column nitrogen generator. Nitrogen rich vapor is condensed to form reflux through the vaporization of an oxygen-rich liquid stream produced as column bottoms. The vaporized oxygen-rich stream is in part recompressed in a recycle compressor, cooled and reintroduced back into the column to increase nitrogen production. The vaporized oxygen-rich stream is also in part expanded with the performance of work. The work of expansion is applied to the compression. A supplemental refrigerant stream produced by a nitrogen liquefaction unit allows the nitrogen to be taken as a liquid and increases the amount of work of expansion able to be applied to the compression.

REFERENCES:
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patent: 3370435 (1968-02-01), Arregger
patent: 4375367 (1983-03-01), Prentice
patent: 4655809 (1987-04-01), Shenoy
patent: 5006137 (1991-04-01), Agrawal et al.
patent: 5275003 (1994-01-01), Agrawal et al.
patent: 5311744 (1994-05-01), Sweeney et al.

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