Capture and sequestration of carbon dioxide in flue gases

B - Operations – Transporting – 01 – D

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B01D 53/62 (2006.01) B01D 53/14 (2006.01)

Patent

CA 2721677

There is provided a process for the capture and sequestration of carbon dioxide that would otherwise enter the at-mosphere and contribute to global warming and other problems. CO2 capture is accomplished by reacting carbon dioxide in flue gas with an alkali metal carbonate, or a metal oxide, particularly containing an alkaline earth metal or iron, to form a carbonate salt. A preferred carbonate for CO2 capture is a dilute aqueous solution of additive-free (Na2CO3). Other carbonates include (K2-CO3) or other metal ion that can produce both a carbonate and a bicarbonate salt. Examples of suitable metal oxides include sev-eral alkaline earths including CaO and MgO. The captured CO2 is preferably sequestered using any available mineral or industrial waste that contains calcium magnesium or iron in non- carbonate forms, or iron in the Fe+2 oxidation state.

L'invention concerne un procédé de capture et de séquestration de dioxyde de carbone qui serait autrement libéré dans l'atmosphère et contribuerait au réchauffement planétaire et à d'autres problèmes. La capture de CO2 est mise en uvre par la mise en réaction du dioxyde de carbone d'un gaz de combustion avec un carbonate de métal alcalin, ou un oxyde métallique contenant en particulier un métal alcalino-terreux ou du fer, afin de former un sel de carbonate. Le carbonate préféré pour la capture du CO2 est une solution aqueuse diluée de (Na2CO3) dépourvue d'additif. D'autres carbonates comprennent du (K2CO3) ou un autre ion métallique pouvant produire à la fois un sel de carbonate et un sel de bicarbonate. Les oxydes métalliques appropriés comprennent par exemple plusieurs terres alcalines, y compris CaO et MgO. Le CO2 capturé est de préférence séquestré à l'aide d'un minéral quelconque disponible ou de déchets industriels contenant du calcium, du magnésium ou du fer sous des formes autres que le carbonate, ou du fer à l'état d'oxydation Fe+2.

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