Refrigeration – Cryogenic treatment of gas or gas mixture – Separation of gas mixture
Patent
1996-07-01
1997-08-26
Kilner, Christopher
Refrigeration
Cryogenic treatment of gas or gas mixture
Separation of gas mixture
62940, F25J 304
Patent
active
056600593
ABSTRACT:
An air separation plant and process in which a first stream of compressed feed air is introduced in vapour state into a higher pressure rectification column and separated therein into nitrogen vapour and oxygen-enriched liquid air and a flow of the nitrogen vapour is condensed in condenser-reboiler. A flow of the oxygen-enriched liquid air is separated in a reboiled lower pressure rectification column into nitrogen-rich and oxygen-rich fractions. A first flow of the condensed nitrogen is employed as reflux in the higher pressure rectification column and a second flow of the condensed nitrogen is employed as reflux in the lower pressure rectification column. A flow of compressed feed air is expanded in expansion turbine with the performance of external work so as to create refrigeration for the process. Products of the separation include one or both of a gaseous nitrogen product taken from the higher pressure rectification column and a liquid nitrogen product. A second stream of compressed feed air is liquefied. At least a part of the liquefied second air stream is vaporised in vaporiser at a pressure less than that at the top of the higher pressure rectification column by indirect heat exchange with a part of the said flow of nitrogen vapour, and the resulting vaporised air is warmed, is recompressed, and is mixed with feed air upstream of a location from where the first stream is taken.
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Kilner Christopher
Pace Salvatore P.
Rosenblum David M.
The BOC Group plc
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