Refrigeration – Processes – Circulating external gas
Patent
1993-03-04
1994-09-13
Capossela, Ronald C.
Refrigeration
Processes
Circulating external gas
62 41, F25J 300
Patent
active
053457730
ABSTRACT:
A method and apparatus for separating air by low temperature liquefaction and fractionation wherein feed air is compressed and cooled and supplied to the high pressure stage of a two-stage fractionation column from the bottom of the high pressure stage of which liquid is expanded and introduced at an intermediate level of the low pressure stage and a gaseous nitrogen product is removed from the top of the high pressure stage of the column, and wherein an oxygen product is removed from the bottom of the low pressure stage and a gaseous nitrogen product is removed from the top of the low pressure stage. Both stages contain solid material providing solid surfaces on which mass transfer takes place to effect fractionation over a substantial vertical distance. The improvement comprises removing a liquid from the high pressure stage intermediate the height of the solid material therein. The removed liquid is subcooled and expanded to produce a gas and a liquid, and the last-named liquid is withdrawn as ultra-high purity nitrogen.
REFERENCES:
patent: 5006139 (1991-04-01), Agrawal et al.
patent: 5157926 (1992-10-01), Guilleminot
Nagamura Takashi
Yamamoto Takao
Capossela Ronald C.
Teisan Kabushiki Kaisha
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