1 Purification of Oxyfuel-Derived CO2 for Sequestration or EOR

Certain CO2 capture processes, particularly Oxyfuel combustion in a pulverised fuel coal-fired power station, produce a raw CO2 product containing contaminants such as water vapour, and oxygen, nitrogen and argon derived from the excess oxygen, impurities in the oxygen used, and any air leakage into the system. There are also acid gases present, such as SO3, SO2, HCl and NOX produced as products of combustion. These acidic impurities will need to be removed from the CO2 stream before it is introduced into the pipeline to prevent corrosion and comply with possible regulations. There may also be other stringent requirements on purity, particularly for applications such as enhanced oil recovery. In this paper we present an integrated process for CO2 compression and simultaneous purification to produce CO2 product streams at purities up to essentially pure CO2