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Temperature swing adsorption of CO2 from flue gas using a parallel channel contractor

  • US 7,947,120 B2
  • Filed: 05/16/2008
  • Issued: 05/24/2011
  • Est. Priority Date: 05/18/2007
  • Status: Active Grant
First Claim
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1. A process for the removing CO2 from a flue gas stream containing CO2, which process comprises:

  • a) conducting said flue gas stream to a temperature swing adsorption gas separation unit wherein the gas separation unit contains at least one adsorbent contactor comprised of;

    i) a process gas inlet end; and

    ii) a process gas outlet end;

    wherein the gas inlet end and the gas outlet end are in fluid connection by a plurality of open flow channels wherein the surfaces of the open flow channels are comprised of an adsorbent material that has an adsorption selectivity for CO2 over at least one other gaseous component of the flue gas stream of greater than 1, thereby resulting in a substantially CO2-free flue gas stream and CO2 adsorbed onto said adsorbent material;

    b) venting said substantially CO2-free flue gas stream into the atmosphere; and

    c) heating said adsorbent material having CO2 adsorbed thereon to an effective temperature that results in the desorption of at least a fraction of CO2, thereby resulting in a CO2 rich stream;

    wherein the adsorbent contactor has less than about 20% of its open pore volume in pores greater than about 20 angstroms, and wherein the open pore volume (in volume percentage) is defined as the volume of the pores in the adsorbent structure that are greater than about 20 angstroms in diameter that are not occupied by a blocking agent divided by the total volume of the adsorbent contactor that is occupied by the adsorbent material; and

    the adsorbent contactor is comprised of substantially parallel channels wherein the geometry of the adsorbent contactor is selected from monoliths, a plurality of tubular members, stacked layers of adsorbent sheets with or without spacers between each sheet, multi-layered spiral rolls, bundles of hollow fibers, and bundles of substantially parallel solid fibers.

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