Method for removing acid gas components from gases

Details Method for removing acid gas components from gases Method for removing acid gas components from gases

B - Operations, Transporting

01

D

B01D 53/14 (2006.01) C10K 1/10 (2006.01) C10K 1/14 (2006.01) C10L 3/10 (2006.01)

Patent

CA 2336043

The invention relates to a method for removing acid gas components from gases, the components being from the group consisting of CO2, H2S, COS, CS2 and mercaptans, wherein a crude gas rich in acid gas components is brought into contact with an absorbing agent in an absorption step, whereby a pure gas poor in acid gas components and an absorbing agent charged with acid gas components is obtained, wherein a mixture is used as absorbing agent, containing: a) 0.1 to 50 % by weight of one or several unsubstituted and/or once or several times OH, C1-C3-alkyl and/or C1-C3-hydroxyalkyl carbon substituted mono- or bicyclic nitrogen heterocycles with 5 to 14 ring atoms and 1 or 2 heterocyclically bonded nitrogen atoms per ring as constituents A; b) 1 to 60 % by weight of a mono or polyvalent alcohol as constituent B; c) 0 to 60 % by weight of an aliphatic aminoalcohol as constituent C; d) 0 to 98.9 % by weight of water as constituent D; e) 0 to 35 % by weight of K2CO3 as constituent E, wherein the sum of constituents A, B, C, D and E equals 100 % by weight.

L'invention concerne un procédé permettant d'éliminer d'un gaz ses composants acides, qui peuvent être CO2, H2S, COS, CS ou des mercaptans. Le procédé comprend une étape d'absorption, consistant à mettre en contact un gaz brut riche en composants acides avec un agent absorbant, qui permet d'obtenir un gaz pur pauvre en composants acides et un agent absorbant chargé desdits constituants acides. L'agent absorbant utilisé est un mélange comprenant: a) 0,1 à 50 % en poids d'un ou de plusieurs hétérocycles mono ou bicycliques azotés non substitués et/ou substitués une ou plusieurs fois au niveau de l'atome de carbone par OH, alkyle C1-C3 et/ou hydroxyalkyle C1-C3, comportant 5 à 14 atomes cycliques et, par cycle, 1 ou 2 atomes d'azote liés hétérocycliques, lesdits hétérocycles représentant le composant A; b) 1 à 60 % en poids d'un ou de plusieurs alcools mono et/ou plurivalents, représentant le composant B; c) 0 à 60 % en poids d'un aminoalcool aliphatique, représentant le composant C; d) 0 à 98,9 % en poids d'eau, représentant le composant D; et e) 0 à 35 % en poids de K2CO3, représentant le composant E; la somme des composants A, B, C, D et E donnant 100 % en poids.

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