Patent ID: 7829049

Claim:
A method for recovery of high purity carbon dioxide from a gaseous source comprising: a. feeding a gas (G 1 ) comprising carbon dioxide, oxygen, and nitrogen compounds into an absorption column (A 1 ), b. absorbing the gas (G 1 ) in an alkanolamine-containing absorbing agent, by which the gas (G 1 ) is separated into a carbon dioxide-depleted gas (G 2 ) and a carbon dioxide-rich liquid (L 1 ), c. pressurising and heating the carbon dioxide-rich liquid (L 1 ) obtained in step b in order to provide the liquid (L 2 ), d. separating by flashing the liquid (L 2 ) obtained in step c into a NOx- and oxygen-rich gas (G 3 ) and a NOx- and oxygen-depleted liquid leaving the flash column (A 3 ), e. pressurising the liquid leaving the flash column (A 3 ) in step d in order to provide the liquid (L 3 ), f. separating the liquid (L 3 ) obtained in step e into a carbon dioxide-rich gas (G 4 ) and a carbon dioxide-depleted liquid (L 4 ), by stripping, and g. purifying the carbon dioxide-rich gas (G 4 ) obtained in step f in order to produce high purity carbon dioxide, which is substantially free of nitrogen oxides.