Refrigeration – Processes – Circulating external gas
Patent
1993-07-15
1994-08-30
Capossela, Ronald C.
Refrigeration
Processes
Circulating external gas
62 39, 62 41, F25J 302
Patent
active
053416465
ABSTRACT:
The present invention relates to an improved cryogenic process for the separation of air to produce an oxygen product and a nitrogen product. The present invention employs a distillation column system with three distillation columns, a low pressure column, a medium pressure column and a high pressure column. The improved three column distillation system process comprises: (a) producing an oxygen product with a product purity of less than 98% purity oxygen and producing no argon product; (b) producing a gaseous nitrogen product which represents greater than 35% of the feed air and which is removed from the medium and/or high pressure columns; (c) recovering a major portion of the oxygen product from the low pressure column; and (d) condensing at least a portion of the high pressure nitrogen overhead from the high pressure column by heat exchange against a liquid stream in the medium pressure column and utilizing at least a portion of the condensed portion to provide reflux to the high pressure column.
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patent: 5163296 (1992-11-01), Ziemer et al.
patent: 5230217 (1993-07-01), Agrawal et al.
patent: 5231837 (1993-08-01), Ha
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Latimer, R. E., "Distillation of Air"--CEP--Feb. 1967--pp. 35-59.
Agrawal Rakesh
Langston Jeffrey S.
Rodgers Paul
Xu Jianguo
Air Products and Chemicals Inc.
Capossela Ronald C.
Jones II Willard
Marsh William F.
Simmons James C.
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