Carbon dioxide recovery from an oxygen containing mixture

  • US 6,174,506 B1
  • Filed: 06/10/1999
  • Issued: 01/16/2001
  • Est. Priority Date: 06/10/1999
  • Status: Expired due to Term
First Claim
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1. A method for recovering carbon dioxide from a carbon dioxide containing gas, comprising:

  • a) passing a gas comprising carbon dioxide and oxygen in countercurrent contact with an absorbent solution comprising at least one alkanolamine and transferring carbon dioxide and oxygen from said gas into said absorbent solution;

    b) separating oxygen from the carbon dioxide and oxygen containing absorbent solution by countercurrently contacting the carbon dioxide and oxygen containing absorbent solution with an oxygen scavenging gas to obtain an oxygen depleted, carbon dioxide containing absorbent solution;

    c) heating the oxygen depleted, carbon dioxide containing absorbent solution to obtain a heated oxygen depleted, carbon dioxide containing absorbent solution;

    d) separating carbon dioxide from the heated oxygen depleted, carbon dioxide containing absorbent solution, and e) recovering carbon dioxide from the absorbent solution to obtain a regenerated absorbent solution and a carbon dioxide rich fluid.

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