| abstract |
SO 2 and/or NO x are removed from gaseous CO 2 at elevated pressure(s) in the presence of molecular oxygen and water and, when SO 2 is to be removed, NO x , to convert SO 2 to sulfuric acid and/or NO x to nitric acid. The sulfuric acid and/or nitric acid is/are then removed from the gaseous carbon dioxide to produce SO 2 -free, NO x -lean carbon dioxide gas. The invention has particular application in the removal of SO 2 and/or NO x from carbon dioxide flue gas produced in an oxyfuel combustion process, for example, in a pulverized coal fired power station. |