CARBON DIOXIDE LIQUEFACTION PROCESS

摘要

PURPOSE: A carbon dioxide liquefaction process is provided to simplify carbon dioxide liquefaction by using a part of a feed stream in super cooling. CONSTITUTION: A carbon dioxide liquefaction process comprises next steps: liquefying a feed stream including carbon dioxide through heat exchange at a first heat exchange region; cooling the feed stream at the first heat exchange region through heat exchange with refrigerant; excessive cooling the feed stream which passed through the first heat exchange region(641) by heat exchanging at a second heat exchange region; separating the feed stream which passed through the second heat exchange region into a first sub-stream and a second sub stream; expanding the first sub-stream in order to lower temperature of the first sub-stream; mixing the first sub-stream with the feed stream after heat exchange at the second heat exchange region(642); collecting at least a part of the second sub-stream as liquefied carbon dioxide.