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Process for removing carbon dioxide regeneratively from gas streams

  • US 5,520,894 A
  • Filed: 12/23/1994
  • Issued: 05/28/1996
  • Est. Priority Date: 07/02/1992
  • Status: Expired due to Term
First Claim
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1. Process for removing carbon dioxide from a hot gas stream selected from the group consisting of fuel gas and flue gas, which comprises the following sequential steps of:

  • a) passing the gas stream through an absorbent-containing absorber wherein carbon dioxide from the gas stream is absorbed on the absorbent which is selected from the group consisting of CaO, MgO, CaCO3 ·

    MgO and mixtures thereof, the absorption being carried out at such a temperature that the heat resulting from the absorption is captured in a heat exchanger and can be used for generating energy,b) discharging the gas stream from the absorber,c) desorbing at least partially the CO2 from the absorbent from step a) in a desorber by transferring at least a portion of the CO2 -loaded absorbent from the desorber into a heat exchanger where the heat from the hot gas stream liberates at least a portion of the CO2 from the CO2 -loaded absorbent thereby regenerating the absorbent and returning the regenerated absorbent back into said desorberd) returning the absorbent to the absorber of step a).

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