Highly efficient absorbents for acidic gas separation

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B01D 53/14 (2006.01) B01D 53/62 (2006.01) C01B 31/20 (2006.01) B01D 53/96 (2006.01) C07C 215/08 (2006.01) C07D 241/04 (2006.01)

Patent

CA 2616271

Provided is a high-efficiency, low-energy type mixed absorbent for separation of carbon dioxide, which has a rapid reaction rate with carbon dioxide and a high-carbon dioxide absorption capacity and does not require a large amount of energy for regeneration of the absorbent, in conjunction with low risk of absorbent oxidation. The absorbent comprises a mixed aqueous solution of: 100 parts by weight of a compound of Formula 1 having one alcoholic hydroxyl group and one primary amine in the molecular structure with no substituent being on the alpha carbon adjacent to the amine and both of an alkyl substituent and an alcoholic hydroxyl group being on the beta carbon, and 1 to 60 parts by weight of a heterocyclic compound of Formula 2 having at least one amine in the ring: (See formula 1) (See formula 2) wherein R1, R2, R3, R4, R5, and X are as defined in the specification.

Divulgation d'un absorbant mixte de type basse énergie et à haute efficacité pour la séparation du dioxyde de carbone. Cet absorbant réagit rapidement avec le dioxyde de carbone et a une capacité d'absorption du dioxyde de carbone élevée. Il ne requiert pas une grande quantité d'énergie pour sa régénération et exhibe un faible risque d'oxydation. Cet absorbant comprend une solution aqueuse mixte de : 100 parties en poids d'un composé de formule 1 comportant un groupe hydroxyle alcoolique et un groupe amine primaire, aucun substituant n'étant présent sur le carbone en position alpha par rapport au groupe amine et un groupe substituant alkyle et un groupe hydroxyle alcoolique étant tous deux sur le carbone en position bêta; de 1 à 60 parties en poids d'un composé hétérocyclique de formule 2 comportant au moins un groupe amine dans le noyau (voir la formule 1) voir la formule 2), dans lesquelles R1, R2, R3, R4, R5 et X sont tels que définis dans les spécifications.

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