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Process for carbon dioxide recovery from a gas stream containing carbon dioxide and hydrocarbons

  • US 10,456,729 B2
  • Filed: 08/05/2014
  • Issued: 10/29/2019
  • Est. Priority Date: 07/29/2014
  • Status: Active Grant
First Claim
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1. A carbon dioxide gas treating process, the process comprising:

  • providing a carbon dioxide gas feedstream having one or more C1-C5 hydrocarbon;

    providing a first separation unit including a first adsorption unit and a first regeneration unit, the first adsorption unit including a first adsorption bed having a first adsorbent media that adsorbs the one or more C1-C5 hydrocarbon of the carbon dioxide gas feedstream, the first adsorbent media being a copolymer of one or more monoaromatic monomers and one or more nonaromatic monovinylidene monomers and being a porous cross-linked polymeric adsorbent that adsorbs a C3 hydrocarbon of the one or more C1-C5 hydrocarbon of the carbon dioxide gas feedstream, and the first regeneration unit including a microwave heating system;

    passing the carbon dioxide gas feedstream through the first adsorption unit at a first flow rate, and generating a loaded first adsorbent media including the one or more C1-C5 hydrocarbon of the carbon dioxide gas feedstream and a first treated carbon dioxide-rich gas stream;

    regenerating the loaded first adsorbent media in the first regeneration unit by releasing the one or more C1-C5 hydrocarbon of the carbon dioxide gas feedstream from the loaded first adsorbent media, forming regenerated first adsorbent media and released one or more C1-C5 hydrocarbon of the first adsorbent media and recovering, further separating, providing as fuel for a combustion process, flaring, or a combination thereof the released one or more C1-C5 hydrocarbon of the first adsorbent media;

    providing the first treated carbon dioxide-rich gas stream to a second separation unit, the first treated carbon dioxide-rich treated gas stream having one or more C1-C5 hydrocarbon, the second separation unit including a second adsorption unit and a second regeneration unit, the second adsorption unit including a second adsorption bed having a second adsorbent media that is a pyrolyzed macroporous polymeric adsorbent that adsorbs a C2 hydrocarbon of the one or more C1-C5 hydrocarbon of the first treated carbon dioxide-rich gas stream and CO2, and the second regeneration unit including a microwave heating system;

    passing the first treated carbon dioxide-rich gas stream through the second adsorption unit at a second flow rate, and generating a second loaded adsorbent media including the one or more C1-C5 hydrocarbon of the first treated carbon dioxide-rich gas stream and a second treated carbon dioxide-rich gas stream;

    regenerating the loaded second adsorbent media in the second regeneration unit by releasing the one or more C1-C5 hydrocarbon of the first treated carbon dioxide-rich treated gas stream from the loaded second adsorbent media, forming regenerated second adsorbent media and released one or more C1-C5 hydrocarbon of the second adsorbent media, and recovering, further separating, providing as fuel for a combustion process, flaring, or a combination thereof the released one or more C1-C5 hydrocarbon of the second adsorbent media;

    providing the second treated carbon dioxide-rich gas stream to a third separation unit, the second treated carbon dioxide-rich treated gas stream including one or more C1-C5 hydrocarbon, recovering the C2 hydrocarbon of the one or more C1-C5 hydrocarbon of the second treated carbon dioxide-rich treated gas stream in the third separation unit, and the third separation unit including a condenser or a chiller;

    liquefying the one or more C1-C5 hydrocarbon of the second treated carbon dioxide-rich gas stream, and generating one or more liquefied C1-C5 hydrocarbon and a third treated carbon dioxide-rich gas stream in the third separation unit;

    recovering the one or more liquefied C1-C5 hydrocarbon for transportation, providing as fuel for a combustion process, for flaring, or a combination thereof; and

    providing the third carbon dioxide-rich gas stream to one or more additional separation unit for further treatment, injecting the third treated carbon dioxide-rich treated gas stream into an injection well, or a combination thereof.

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