CO2 CAPTURE VIA AMINE-CO2 PRODUCT PHASE SEPARATION
First Claim
1. A method for separating carbon dioxide from a gas stream, comprising:
- contacting a gas stream containing CO2 in a sorption zone with a sorption solution comprising an amine, the sorption solution having a total amine concentration of at least about 2.0 M, at a temperature of at least 10°
C. to sorb at least a portion of the CO2 into the sorption solution and form a rich stream of the sorbed in the sorption solution comprising one or more amine-CO2 reaction products dissolved in the solution;
passing the rich stream from the sorption zone to a second zone and precipitating at least a portion of the amine-CO2 reaction products to form a precipitate slurry;
separating the precipitate slurry to form a portion enriched in precipitate solids and a first recycle stream, the first recycle stream comprising a majority of the solvent from the precipitate slurry; and
passing the portion enriched in precipitate solids to one or more regeneration zones and desorbing the sorbed CO2 as gas to form a second recycle stream, the second recycle portion containing a lower concentration of CO2 than the rich stream and containing an increased concentration of amine relative to the rich stream,wherein the sorption solution comprises at least a portion of the first recycle stream and at least a portion of the second recycle stream.
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Accused Products
Abstract
Systems and methods are provided for performing CO2 sorption and regeneration processes that can take advantage of phase changes between solutions of amine-CO2 reaction products and precipitate slurries, where the slurry particles can include solid precipitates formed based on the amine-CO2 reaction products. An amine solution can be used to capture CO2 from a gas phase stream. During this initial capture process, the amine-CO2 reaction product can remain in solution. The solution containing the amine-CO2 reaction product can then be exposed to a set of conditions which result in precipitation of a portion of the amine-CO2 reaction product to form a slurry. The precipitate slurry can be passed into one or more release stages where the conditions for the slurry are altered to allow for release of the CO2.
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Citations
20 Claims
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1. A method for separating carbon dioxide from a gas stream, comprising:
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contacting a gas stream containing CO2 in a sorption zone with a sorption solution comprising an amine, the sorption solution having a total amine concentration of at least about 2.0 M, at a temperature of at least 10°
C. to sorb at least a portion of the CO2 into the sorption solution and form a rich stream of the sorbed in the sorption solution comprising one or more amine-CO2 reaction products dissolved in the solution;passing the rich stream from the sorption zone to a second zone and precipitating at least a portion of the amine-CO2 reaction products to form a precipitate slurry; separating the precipitate slurry to form a portion enriched in precipitate solids and a first recycle stream, the first recycle stream comprising a majority of the solvent from the precipitate slurry; and passing the portion enriched in precipitate solids to one or more regeneration zones and desorbing the sorbed CO2 as gas to form a second recycle stream, the second recycle portion containing a lower concentration of CO2 than the rich stream and containing an increased concentration of amine relative to the rich stream, wherein the sorption solution comprises at least a portion of the first recycle stream and at least a portion of the second recycle stream. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for separating carbon dioxide from a gas stream, comprising:
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contacting a gas stream containing CO2 in a sorption zone with a sorption solution comprising a sterically hindered amine, the sorption solution having a total amine concentration of at least about 2.5 M, at a temperature of at least 10°
C. to sorb at least a portion of the CO2 into the sorption solution and form a rich stream of the sorbed CO2 in the sorption solution comprising one or more amine-CO2 reaction products dissolved in the solution;passing the rich stream from the sorption zone to a second zone and precipitating at least a portion of the amine-CO2 reaction products to form a precipitate slurry; separating the precipitate slurry to form a portion enriched in precipitate solids and a first recycle stream, the first recycle stream comprising a majority of the solvent from the precipitate slurry, at least 80 wt % of the precipitate solids comprising a bicarbonate salt; and passing the portion enriched in precipitate solids to one or more regeneration zones and desorbing the sorbed CO2 as gas to form a second recycle stream, the second recycle portion containing a lower concentration of CO2 than the rich stream and containing an increased concentration of sterically hindered amine relative to the rich stream, wherein the sorption solution comprises at least a portion of the first recycle stream and at least a portion of the second recycle stream.
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Specification