CRYOGENIC AIR SEPARATION

摘要

A cryogenic air separation system wherein nitrogen vapor (10) from a higher pressure column (30) and oxygen liquid from a lower pressure column (31) eac h pass down through a once-through main condenser (32) in heat exchange relati on and some but not all of the oxygen liquid is vaporized such that the oxygen liquid (33) and vapor (34) exit the condenser (32) in a liquid to vapor mass flowrate ratio within the range of from 0.05 to 0.5 whereby the need for a recirculation pump to ensure avoidance of oxygen boiling to dryness is eliminated.