Method for capturing co2 from exhaust gas

B - Operations – Transporting – 01 – D

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

Patent

CA 2672641

The présent invention relates to a method for capturing CO2 from exhaust gas in an absorber (A1 ), wherein the CO2 containing gas is passed through an aqueous absorbent slurry wherein said aqueous absorbent slurry comprises an inorganic alkali carbonate, bicarbonate and at least one of an absorption promoter and a catalyst, and wherein the CO2 is converted to solids by précipitation in the absorber, said slurry having the precipitated solids is conveyed to a separating device (F1), in which the solids are separated off, essentially ail of at least one of the absorption promoter and catalyst is recycled together with the remaining aqueous phase to the absorber.

La présente invention porte sur un procédé de capture du CO2 à partir d'un gaz d'échappement dans un absorbeur (A1), le gaz contenant du CO2 étant amené à passer à travers une suspension absorbante aqueuse, ladite suspension absorbante aqueuse comportant un carbonate alcalin inorganique, un bicarbonate et au moins l'un parmi un promoteur d'absorption et un catalyseur, et dans laquelle le CO2 est converti en matières solides par précipitation dans l'absorbeur, ladite suspension ayant les matières solides précipitées est transportée jusqu'à un dispositif de séparation (F1) dans lequel les matières solides sont séparées, et sensiblement la totalité d'au moins l'un du promoteur d'absorption et du catalyseur est recyclée conjointement avec la phase aqueuse restante à l'absorbeur.

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