Absorbent containing cyclic amines for removing acid gases

B - Operations – Transporting – 01 – D

Patent

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B01D 53/14 (2006.01)

Patent

CA 2750460

The invention relates to an absorbent for removing acid gases from a fluid flow, comprising an aqueous solution A) of at least one cyclic amine compound having exclusively tertiary amine groups and/or sterically hindered secondary amine groups, and B) of at least one cyclic amine compound having at least one sterically unhindered secondary amine group. The absorbent comprises, for example, an aqueous solution of A) 1-hydroxyethyl-piperidine and/or triethylenediamine and B) piperazine. The absorbent is suited especially for separating carbon dioxide from flue gases and meets the following criteria: (i) sufficient capacity at low CO2 partial pressures; (ii) sufficiently fast absorption speed at low CO2 partial pressures; (iii) stability toward oxygen; (iv) low vapor pressure in order to reduce solvent losses; and (v) low energy requirement for regenerating the absorbent.

L'invention porte sur un absorbant destiné à éliminer les gaz acides d'un courant de fluide, l'absorbant comprenant une solution aqueuse A) d'au moins un composé amine cyclique comportant exclusivement des groupes amine tertiaire et/ou des groupes amine secondaire à encombrement stérique, et B) d'au moins un composé amine cyclique comportant au moins un groupe amine secondaire non à encombrement stérique. L'absorbant comprend par exemple une solution aqueuse A) de 1-hydroxyéthyl-pipéridine et/ou triéthylènediamine, et B) de pipérazine. L'absorbant se caractérise en particulier par le fait qu'il sépare le dioxyde de carbone des fumées, et satisfait aux critères suivants : (i) capacité suffisante en présence de faibles pressions partielles de CO2 ; (ii) vitesse suffisamment rapide d'absorption en présence de faibles pressions partielles de CO2 ; (iii) stabilité vis-à-vis de l'oxygène ; (iv) faible pression de vapeur pour diminuer les pertes de solvant ; et (v) faible demande en énergie pour la régénération de l'absorbant.

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