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 the steps of contacting the gas stream with an aqueous composition including a substituted heteroaromatic compound having a six-membered heteroaromatic ring with 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.
Claims18
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:
- (i) at least 10 wt % water;
- and
- (ii) a substituted heteroaromatic compound comprising a six-membered heteroaromatic ring comprising from 1 to 3 nitrogen atoms in the heteroaromatic ring and at least one substituent of formula —R1NH2 wherein R1 is methylene,
- wherein the absorbent lacks at least one of ionic liquids and organic salts.
An absorbent for absorbing carbon dioxide from a gas stream containing carbon dioxide, comprising an aqueous composition of absorbed carbon dioxide comprising:
- (i) water in an amount of at least 10 wt % of the composition;
- (ii) a substituted heteroaromatic compound comprising a six membered heteroaromatic ring comprising from 1 to 3 nitrogen atoms in the heteroaromatic ring and at least one substituent of formula —R1NH2 wherein R1 is methylene;
- and
- (iii) absorbed carbon dioxide,
- wherein the absorbed carbon dioxide is at a concentration above the equilibrium concentration when the composition is exposed to air at below the boiling point of water, and
- wherein the absorbent lacks at least one of ionic liquids and organic salts.
Dependencies are inferred from the claim text.