Purification of carbon dioxide

摘要

A first contaminant selected from oxygen and carbon monoxide is removed from impure liquid carbon dioxide using a mass transfer separation column system which is 5 reboiled by indirect heat exchange against crude carbon dioxide fluid, the impure liquid carbon dioxide having a greater concentration of carbon dioxide than the crude carbon dioxide fluid. The invention has particular application in the recovery of carbon dioxide from flue gas generated in an oxyfuel combustion process or waste gas from a hydrogen PSA process. Advantages include reducing the level of the first contaminant to not more 10 than 1000 ppm. 15 07024 USADOC K103 E107 104 110 El 0 El02 L 105 109 108 107 C102113 E103 106 V103 - L120 21 1 01 124 1 8 E16