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Amine promotion for CO2 capture

  • US 9,707,512 B2
  • Filed: 11/21/2013
  • Issued: 07/18/2017
  • Est. Priority Date: 12/21/2012
  • Status: Active Grant
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 a promoter amine, wherein the promoter amine comprises a bridged derivative of piperidine or piperazine and at least one of a sterically hindered amine and a tertiary amine, the sorption solution having a total amine concentration of at least about 3.0 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 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; and

    passing the portion enriched in precipitate solids to one or more regeneration zones and desorbing the sorbed carbon dioxide as gas to form a second recycle stream, the second recycle stream containing a lower concentration of carbon dioxide than the rich stream and containing an increased concentration of total amine relative to the rich stream,wherein the aqueous 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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