METHOD OF FURTHER PURIFICATION OF CARBON DIOXIDE FROM LOW-BOILING IMPURITIES Russian patent published in 2001 - IPC

FIELD: chemical industry. SUBSTANCE: method comprises compression of original mixture in compressor followed by cooling in water cooler and heat exchange, liquefier drying in adsorption unit, condensation followed by additional purification in rectification column. After drying, some original mixture is directed to rectification column coil pipe, and after mixture is cooled in coil pipe, it is condensed with remaining portion of original mixture and, prior to directing mixture to rectification column for additional purification to it is directed to super cooler in which, in order to overcool main portion of liquid stream, some condensed original mixture throttled to pressure of 0.7-0.8 MPa is used. This invention makes it possible not to use heat of external preheater and CO₂ stream fed upwards column consists only of one liquid phase. EFFECT: more efficient purification method. 3 cl, 2 dwg