Process and system for capture of carbon dioxide
AssigneeCommonwealth Scientific and Industrial Research Organisation
InventorsGraeme Douglas Puxty, William Conway, Qi Yang, Paul Hubert Maria Feron
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Abstract
A process for absorbing carbon dioxide from a gas stream containing carbon dioxide, including contacting the gas stream with an aqueous composition having a substituted heteroaromatic compound including a six-membered heteroaromatic ring comprising from 1 to 3 nitrogen atoms in the heteroaromatic ring and at least one substituent wherein at least one of the substituents is of formula —R1NH2 wherein R1 is selected from C1 to C6 alkylene and ethers of formula —R2—O—R3— wherein R2 and R3 are C1 to C3 alkylene.
Claims20
A process for absorbing carbon dioxide from a gas stream containing carbon dioxide, comprising contacting the gas stream with an absorbent comprising an aqueous composition comprising at least 10 wt % water and a substituted heteroaromatic compound according to formula Ia:
- wherein
- R1 is methylene;
- R4 is an optional carbon substituent selected from the group consisting of C1 to C4 alkyl, hydroxy, hydroxy-C1 to C4 alkyl, C1 to C4 alkoxy, C1 to C4 alkoxy-(C1 to C4 alkyl);
- and
- n is 0, 1 or 2.
A composition of absorbed carbon dioxide comprising:
- A. an aqueous solvent containing water in an amount of at least 10 wt % of the composition;
- B. at least one absorbent compound for carbon dioxide comprising a substituted heteroaromatic compound according to formula Ia
- wherein
- R1 is methylene,
- R4 is an optional carbon substituent selected from the group consisting of C1 to C4 alkyl, hydroxy, hydroxy-C1 to C4 alkyl, C1 to C4 alkoxy, C1 to C4 alkoxy-(C1 to C4 alkyl);
- and n is 0, 1 or 2;
- and
- C. absorbed carbon dioxide, wherein the absorbed carbon dioxide is at a concentration above the equilibrium concentration when the solution is exposed to air at below the boiling point of the solvent.
Dependencies are inferred from the claim text.