Low energy consumption method for separating gaseous mixtures an

Details Low energy consumption method for separating gaseous mixtures an Low energy consumption method for separating gaseous mixtures an

1986-04-22

1988-03-22

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 41, 62 44, F25J 302

Patent

active

047325976

ABSTRACT:
A method for the separation of gaseous mixtures such as air and for producing medium purity oxygen, comprising compressing the gaseous mixture in a first compressor to about 3.9-4.1 atmospheres pressure, passing said compressed gaseous mixture in heat exchange relationship with sub-ambient temperature gaseous nitrogen, dividing the cooled, pressurized gaseous mixture into first and second streams, introducing the first stream into the high pressure chamber of a double rectification column, separating the gaseous mixture in the rectification column into a liquid oxygen-enriched stream and a gaseous nitrogen stream and supplying the gaseous nitrogen stream for cooling the compressed gaseous mixture, removing the liquid oxygen-enriched stream from the low pressure chamber of the rectification column and pumping the liquid, oxygen-enriched steam to a predetermined pressure, cooling the second stream, condensing the cooled second stream and evaporating the oxygen-enriched stream in an evaporator-condenser, delivering the condensed second stream to the high pressure chamber of the rectification column, and heating the oxygen-enriched stream and blending the oxygen-enriched stream with a compressed blend-air stream to the desired oxygen concentration.

REFERENCES:
patent: 3260059 (1966-07-01), Rosenberg et al.
patent: 4272270 (1981-06-01), Higgins
patent: 4453956 (1984-06-01), Fabbri

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