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CO2 CAPTURE VIA AMINE-CO2 PRODUCT PHASE SEPARATION

  • US 20140178278A1
  • Filed: 11/22/2013
  • Published: 06/26/2014
  • Est. Priority Date: 12/21/2012
  • Status: Abandoned Application
First Claim
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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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