Carbon dioxide capture process using hydrogels
AssigneeCommonwealth Scientific and Industrial Research Organisation
InventorsColin D. Wood, Matthew B. Myers, Cameron White
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Abstract
The present application is directed to processes for removing carbon dioxide (CO2) from low CO2 concentration gaseous streams. The process comprises contacting the gaseous stream with a hydrogel for absorbing at least some CO2 from the gaseous stream. The hydrogel comprises a cross-linked hydrophilic polymer comprising a hydrophilic polymer cross-linked with a cross-linking agent. Processes for preparing the hydrogel, types of hydrogels, using the hydrogel to remove CO2 from gaseous streams, and regenerating the hydrogel to recover absorbed CO2 from the hydrogel are also disclosed.
Claims21
A direct air capture (DAC) process for removing carbon dioxide (CO2) from an ambient air stream, comprising:
- contacting the ambient air stream with a swollen hydrogel to absorb CO2 from the ambient air stream resulting in an effluent air stream,
- wherein the swollen hydrogel comprises a cross-linked polyamine or copolymer thereof, wherein the polyamine or copolymer thereof is cross-linked with a cross-linking agent to provide a polymeric network comprising amine groups for absorbing at least some of the CO2, wherein the cross-linking agent comprises two or more epoxides, and
- wherein the swollen hydrogel is swollen with a liquid swelling agent selected from the group consisting of alcohols, polyol compounds, glycols, alkanolamines, alkylamines, alkyloxyamines, piperidines, piperazines, pyridines, pyrrolidones, polyethylene glycol-dimethyl ethers (Selexol), N-methylpyrrolidone, propylene carbonate, sulfolane, imidazoles, ionic liquids, and combinations thereof, for absorbing at least some of the CO2.
Dependencies are inferred from the claim text.