ELECTROLYTIC RECOVERY OF RETAINED CARBON DIOXIDE
First Claim
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1. A method comprising:
- contacting an aqueous solution formed from amine and metal ions with a gas mixture containing carbon dioxide, wherein the contacting forms metallocarbamate complexes from the amine, the metal ions and the carbon dioxide;
separating the aqueous solution from unabsorbed constituents of the gas mixture after the contacting; and
applying an electric potential to the aqueous solution recovered by the separating, wherein the electric potential causes dissociation of the metallocarbamate complexes in order to liberate the carbon dioxide for capture.
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Abstract
Methods and apparatus relate to capturing carbon dioxide. A solution formed from metal ions combined with an amine reagent absorbs carbon dioxide from gas introduced into the solution. Subsequent electrolysis of the solution results in dissociation of complexes formed upon the carbon dioxide being absorbed. The electrolysis thus liberates the carbon dioxide for capture and regenerates the solution for reuse.
58 Citations
20 Claims
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1. A method comprising:
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contacting an aqueous solution formed from amine and metal ions with a gas mixture containing carbon dioxide, wherein the contacting forms metallocarbamate complexes from the amine, the metal ions and the carbon dioxide; separating the aqueous solution from unabsorbed constituents of the gas mixture after the contacting; and applying an electric potential to the aqueous solution recovered by the separating, wherein the electric potential causes dissociation of the metallocarbamate complexes in order to liberate the carbon dioxide for capture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method comprising:
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forming an aqueous solution by mixing monoethanolamine and copper ions from copper sulfate; contacting the aqueous solution with a gas mixture containing carbon dioxide, wherein the contacting forms metallocarbamate complexes from the monoethanolamine, the copper ions and the carbon dioxide; separating the aqueous solution from unabsorbed constituents of the gas mixture after the contacting; pumping the aqueous solution recovered by the separating to increase pressure of the aqueous solution to above a first pressure associated with the contacting; and applying an electric potential to the aqueous solution to liberate from the aqueous solution the carbon dioxide at a second pressure above the first pressure due to the pumping. - View Dependent Claims (17)
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18. A method comprising:
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forming an aqueous solution by mixing amine and metal ions, wherein on a mole basis less of the metal ions are added than the amine; contacting the aqueous solution with a gas mixture containing carbon dioxide, wherein the aqueous solution absorbs the carbon dioxide; separating the aqueous solution from unabsorbed constituents of the gas mixture after the contacting; and applying an electric potential to the aqueous solution recovered by the separating, wherein one of the metal ions reacts with more than one molecule to facilitate liberation of the carbon dioxide and regeneration of the aqueous solution throughout the applying of the electric potential. - View Dependent Claims (19, 20)
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Specification