CO2 separation from low-temperature flue gases
First Claim
1. A method for removing carbon dioxide from a fluid, the method comprising:
- a) forming an aqueous mixture of a phase-separating reactive reagent and a basic moiety;
b) contacting the fluid to the mixture for a time and at a temperature sufficient to form bicarbonate product;
c) allow the mixture to become supersaturated with the product; and
d) separating the product from the mixture as a nonamorphous precipitate.
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Abstract
Two methods are provide for the separation of carbon dioxide from the flue gases. The first method utilizes a phase-separating moiety dissolved in an aqueous solution of a basic moiety to capture carbon dioxide. The second method utilizes a phase-separating moiety as a suspended solid in an aqueous solution of a basic moiety to capture carbon dioxide. The first method takes advantage of the surface-independent nature of the CO2 absorption reactions in a homogeneous aqueous system. The second method also provides permanent sequestration of the carbon dioxide. Both methods incorporate the kinetic rate enhancements of amine-based scrubbing while eliminating the need to heat the entire amine solution (80% water) in order to regenerate and release CO2. Both methods also take advantage of the low-regeneration temperatures of CO2-bearing mineral systems such as Na2CO3/NaHCO3 and K2CO3/KHCO3.
29 Citations
19 Claims
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1. A method for removing carbon dioxide from a fluid, the method comprising:
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a) forming an aqueous mixture of a phase-separating reactive reagent and a basic moiety; b) contacting the fluid to the mixture for a time and at a temperature sufficient to form bicarbonate product; c) allow the mixture to become supersaturated with the product; and d) separating the product from the mixture as a nonamorphous precipitate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for the removal of carbon dioxide from fluid, the method comprising:
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suspending a phase-separating solid agent within an aqueous solution of a basic moiety to create a mixture and; contacting said mixture with the fluid for a time and at a temperature sufficient to form solid carbonates of the agent. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification