Liquid absorbing acidic gases and use thereof in deacidification of gases
First Claim
1. A process for improved CO2 absorption from a gas by an absorbent liquid which has an improved absorption capacity for CO2 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 CO2 and the absorbent liquid with increased CO2 content, and regenerating the absorbent liquid which has an increased CO2 content, thereby releasing the CO2 and producing at least one gaseous fraction containing the released CO2 and at least one portion of the regenerated absorbent liquid and recycling said generated absorbent liquid to the absorption zone, the absorbent liquid being a mixture of one or more tertiary alkanolamines and an activator of improved CO2 absorption by said tertiary alkanolamines, the activator having the general formula ##STR6## wherein X is a divalent radical chosen from C2 -C9 alkylene and C4 -C9 cycloalkylene radicals, the symbols R each being independently, a hydrogen atom or a C1 -C6 monovalent hydrocarbyl radical.
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Abstract
Liquid absorbing acid gas compounds presenting an improved CO2 absorption capacity, said absorbing liquid containing one or a plurality of tertiary alkanolamines and a CO2 absorption activator. The activator is comprised of at least one amino compound selected among polyalkylene-polyamines, alkylenediamines or cycloalkylenediamines, the aminoalkylated compounds of heterocycles such as piperazine, piperidine, furan, thiophene, tetrahydrofuran and tetrahydrothiophene, the alkoxyalkylamines and the alkylmono-alkanolamines having an alkyl residue in at least C2. Application of said absorbent liquid to the deacidification of gases containing CO2 and optionally other acid gas compounds, particularly H2 S and/or COS.
19 Citations
24 Claims
- 1. A process for improved CO2 absorption from a gas by an absorbent liquid which has an improved absorption capacity for CO2 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 CO2 and the absorbent liquid with increased CO2 content, and regenerating the absorbent liquid which has an increased CO2 content, thereby releasing the CO2 and producing at least one gaseous fraction containing the released CO2 and at least one portion of the regenerated absorbent liquid and recycling said generated absorbent liquid to the absorption zone, the absorbent liquid being a mixture of one or more tertiary alkanolamines and an activator of improved CO2 absorption by said tertiary alkanolamines, the activator having the general formula ##STR6## wherein X is a divalent radical chosen from C2 -C9 alkylene and C4 -C9 cycloalkylene radicals, the symbols R each being independently, a hydrogen atom or a C1 -C6 monovalent hydrocarbyl radical.
- 14. An absorbent liquid for improved absorption capacity for CO2 in a gas due to the presence of an activator for CO2 absorption from said gas, the absorbent liquid comprising a mixture of one or more tertiary alkanolamines and the activator of improved CO2 absorption by said tertiary alkanolamines, which activator has the general formula ##STR7## wherein X is a divalent radical chosen from C2 -C9 alkylene and C4 -C9 cycloalkylene radicals, the symbols R each one being independently, a hydrogen atom or a C1 -C6 monovalent hydrocarbyl radical.
Specification