Removal of carbon dioxide from flue gases

Details Removal of carbon dioxide from flue gases Removal of carbon dioxide from flue gases

B - Operations, Transporting

01

D

B01D 53/14 (2006.01)

Patent

CA 2653659

A process is described for removing carbon dioxide from gas streams in which the partial pressure of the carbon dioxide is less than 200 mbar, in particular flue gases, wherein the gas stream is brought into contact with a liquid absorption medium which comprises an aqueous solution (A) of a tertiary aliphatic alkanolamine and (B) of an activator of the general formula R1-NH-R2-NH2, wherein R1 is C1-C6-alkyl and R2 is C2-C6-alkylene, wherein the sum of the concentrations of A and B is 2.5 to 7 mol/l and the molar ratio of B to A is in the range from 1:3 to 1.5:1. The activator is, for example, 3-methylaminopropylamine, the tertiary aliphatic amine methyldiethanolamine, methyldiisopropanolamine or n-butyldiethanolamine. The process permits a substantial removal of carbon dioxide and regeneration of the absorption medium is possible with a comparatively low energy consumption.

L'invention concerne un procédé d'élimination de dioxyde de carbone dans des courants gazeux, dans lesquels la pression partielle du dioxyde de carbone est inférieure à 200 mbar, notamment des fumées. Le courant gazeux est mis en contact avec un agent d'absorption liquide comprenant une solution aqueuse (A) d'une alcanolamine aliphatique tertiaire et (B) un activateur de formule générale R1-NH-R2-NH2, R1 représentant un alkyle en C1-C6 et R2 représentant un alkylène en C2-C6. La somme des concentrations de A et de B est comprise entre 2,5 et 7 mol/l et le rapport molaire entre B et A est compris entre 1:3 et 1,5:1. L'activateur est p. ex. la 3-méthylaminopropylamine, l'amine aliphatique tertiaire la méthyldiéthanolamine, la méthyldiisopropanolamine ou la n-butyldiéthanolamine. Le procédé permet une élimination importante du dioxyde de carbone et la régénération de l'agent d'absorption est possible avec un coût énergétique relativement faible.

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