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Multi-stage CO2 removal system and method for processing a flue gas stream

  • US 8,182,577 B2
  • Filed: 10/21/2008
  • Issued: 05/22/2012
  • Est. Priority Date: 10/22/2007
  • Status: Active Grant
First Claim
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1. A method for removing carbon dioxide from a flue gas stream using a series of absorption stages in which a flue gas stream is contacted with an ionic solution containing ammonia, the series of absorption stages including a first absorption stage and a last absorption stage relative to the flow direction of the flue gas stream, the method comprising:

  • controlling a temperature and an ammonia-to-CO2 mole ratio of the ionic solution provided to each stage in the series of absorption stages such that the ionic solution provided to the first absorption stage has a higher temperature and a lower ammonia-to-CO2 mole ratio than the ionic solution provided to the last absorption stage.

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