Purification of carbon dioxide

Details Purification of carbon dioxide Purification of carbon dioxide

C - Chemistry, Metallurgy

01

B

C01B 31/20 (2006.01) B01D 53/60 (2006.01)

Patent

CA 2568511

SO2 and/or NOx are removed from gaseous CO2 at elevated pressure(s) in the presence of molecular oxygen and water and, when SO2 is to be removed, NOX, to convert SO2 to sulfuric acid and/or NOx to nitric acid. The sulfuric acid and/or nitric acid is/are then removed from the gaseous carbon dioxide to produce S02-free, NOX lean carbon dioxide gas. The invention has particular application in the removal of SO2 and/or NOx from carbon dioxide flue gas produced in an oxyfuel combustion process, for example, in a pulverized coal fired power station.

SO2 et/ou les NOx sont éliminés du CO2 gazeux à pression élevée en présence d'eau et d'oxygène moléculaire en convertissant SO2 en acide sulfurique et/ou les NOx en acide nitrique. L'acide sulfurique et/ou l'acide nitrique sont ensuite éliminés du dioxyde de carbone gazeux pour produire du dioxyde de carbone pauvre en NOx et exempt de SO2. L'invention s'applique particulièrement à l'élimination du SO2 et/ou des NOx contenus dans le gaz de carneau constitué de dioxyde de carbone produit par un procédé d'oxycombustion, p. ex., une centrale énergétique à charbon pulvérisé.

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