Method for the removal of carbon dioxide from gas flows with...

B - Operations – Transporting – 01 – D

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B01D 53/14 (2006.01)

Patent

CA 2559081

The invention relates to a method for the removal of carbon dioxide from a gas flow with a carbon dioxide partial pressure in the gas flow of less than 200 mbar, whereby the gas flow is brought into contact with a liquid absorption agent, selected from an aqueous solution (A) of an amino compound with at least two tertiary amino groups in the molecule and (B) an activator, selected from the primary and secondary amines, or (A) a tertiary aliphatic amine, the reaction enthalpy .DELTA.R H for the protonation of which is greater than that for methyldiethanolamine and (B) an activator, selected from 3-methylaminopropylamine, piperazine, 2-methylpiperazine, N-methylpiperazine, homopiperazine, piperidine and morpholine. The method is particularly suitable for the treatment of flue gases and also relates to an absorption agent.

L'invention concerne un procédé d'élimination du dioxyde de carbone dans un courant gazeux, procédé dans lequel la pression partielle du dioxyde de carbone dans le courant gazeux est inférieure à 200 mbar, caractérisé en ce qu'on met en contact le courant gazeux avec un agent d'absorption liquide comprenant une solution aqueuse (A) d'un composé amine ayant au moins deux groupes amino tertiaires dans la molécule, et (B) d'un activateur qui est sélectionné à partir d'amines primaires et secondaires, ou (A) d'une amine aliphatique tertiaire, dont l'enthalpie de réaction RH de sa protonation est supérieure à celle de la méthyldiéthanolamine, et (B) d'un activateur qui est sélectionné à partir de la 3-méthylaminopropylamine, pipérazine, 2-méthylpipérazine, N-méthylpipérazine, homopipérazine, pipéridine et morpholine. Le procédé convient particulièrement pour le traitement des gaz de fumée. L'invention concerne également un agent d'absorption.

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