Refrigeration – Cryogenic treatment of gas or gas mixture – Separation of gas mixture
Patent
1996-07-31
1998-09-15
Bennett, Henry A.
Refrigeration
Cryogenic treatment of gas or gas mixture
Separation of gas mixture
62 25, 62 24, 62 38, 62 39, F25J 500
Patent
active
058063412
ABSTRACT:
Air is compressed in an arrangement of compressors. A first flow of the thus compressed air flows through a main heat exchanger from its warm end to its cold end and is liquefied by passage through a valve. Two second stream of compressed air are taken. One is expanded in one expansion turbine and the other in another expansion turbine. The streams leaving the valve and the one expansion turbine are separated in a double rectification column. Liquid oxygen product is extracted from outlet thereof. Part is taken as liquid product and the rest is vaporized by passage through the heat exchanger from its cold end to its warm end and taken as gaseous oxygen product. The ratio of liquid oxygen product to total oxygen product is capable of being varied. Accordingly a chosen but variable proportion of the two second air streams flows to the double rectification column and a chosen but variable proportion of the two second air streams is returned to the arrangement of compressors to an intermediate compressor.
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patent: 5152149 (1992-10-01), Mostello et al.
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patent: 5329776 (1994-07-01), Grenier
patent: 5355681 (1994-10-01), Xu
patent: 5428962 (1995-07-01), Rieth
Bennett Henry A.
O'Connor Pamela A.
Pace Salvatore P.
Rosenblum David M.
The BOC Group plc
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