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AssigneeElf Aquitaine Production
InventorsJean-Louis Peytavy, Philippe Le Coz, Olivier Oliveau
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Liquid absorbing acid gas compounds presenting an improved CO.sub.2 absorption capacity, said absorbing liquid containing one or a plurality of tertiary alkanolamines and a CO.sub.2 absorption activator. The activator is comprised of at least one amino compound selected amongst polyalkylenepolyamines, alkylenediamines or cycloalkylenediamines, the aminoalkylated compounds of heterocycles such as piperazine, piperidine, furan, thiophene, tetrehydrofuran et tetrahydrothiophene, the alkoxyalkylamines and the alkylmonoalkanolamines having an alkyl residue in at least C.sub.2. Application of said absorbant liquid to the deacidification of gases containing CO.sub.2 and optionally other acid gas compounds, particularly H.sub.2 S and/or COS.
An absorbent liquid for improved absorption capacity for CO.sub.2 in a gas due to the presence of an activator for CO.sub.2 absorption from said gas, the absorbent liquid comprising a mixture of one or more tertiary alkanolamines and the activator of improved CO.sub.2 absorption by said tertiary alkanolamines, said activator having the general formula R.sub.1 --NH--(C.sub.p H.sub.2p)--OH in which R.sub.1 is a C.sub.2 -C.sub.6 monovalent hydrocarbon radical, and p is an integer of 1 to 6, and which said activator of said tertiary alkanolamines is present in an activating amount, said activated amines having improved CO.sub.2 absorption capacity.
A process for improved CO.sub.2 absorption from a gas by an absorbent liquid which has an improved absorption capacity for CO.sub.2 which process comprises contacting said gas and the absorbent liquid in an absorption zone having an upper and lower part, thereby obtaining a treated gas with a reduced content of CO.sub.2 and the absorbent liquid with increased CO.sub.2 content, and regenerating the absorbent liquid which has an increased CO.sub.2 content, thereby releasing the CO.sub.2 and producing at least one gaseous fraction containing the released CO.sub.2 and at least one portion of the regenerated absorbent liquid and recycling said regenerated absorbent liquid to the absorption zone, the absorbent liquid being a mixture of one or more tertiary alkanolamines and an activator of improved CO.sub.2 absorption by said tertiary alkanolamines, said activator having the general formula R.sub.1 --NH--(C.sub.p H.sub.2p)--OH in which R.sub.1 is a C.sub.2 -C.sub.6 monovalent hydrocarbon radical, and p is an integer of 1 to 6, the activator of the tertiary alkanolamines being present in an activating amount to increase CO.sub.2 absorption by said activated amines.
Dependencies are inferred from the claim text.