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Removal of corrosive contaminants from alkanolamine absorbent process

  • US 6,334,886 B1
  • Filed: 05/12/2000
  • Issued: 01/01/2002
  • Est. Priority Date: 05/12/2000
  • Status: Expired due to Fees
First Claim
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1. In a process for removing CO2 and/or H2S from a gas mixture containing as impurities CO2 and/or H2S and at least one other impurity selected from the group consisting of a cyanide and ammonia, wherein:

  • said gas mixture is conveyed to an absorber vessel and contacted with an aqueous absorbent solution containing an acid gas removal solvent to remove CO2 and/or H2S from said gas mixture and form a rich aqueous absorbent solution enriched in CO2 and/or H2S removed from said gas mixture;

    said rich aqueous absorbent solution is conveyed from said absorber vessel to a stripping vessel, and thermally stripped of CO2 and/or H2S to form a lean aqueous absorbent solution depleted of CO2 and/or H2S, and an overhead vapor stream rich in CO2 and/or H2S and said at least one other impurity;

    said lean aqueous absorbent solution is recycled from said stripping vessel to said absorber vessel to absorb additional amounts of said gas mixture;

    said overhead vapor stream is cooled in a heat exchanger to provide a two phase outlet stream and said two phase outlet stream is separated in a separator vessel to provide an acid gas rich stream and an acid gas removal solvent rich aqueous solution; and

    recycling said acid gas removal solvent rich aqueous solution for further use in said process, the improvement comprising contacting at least a portion of said acid gas removal solvent rich aqueous solution with an anion exchange resin to remove from said acid gas removal solvent rich aqueous solution at least a part of said at least one other impurity prior to said recycling of said acid gas removal solvent rich aqueous solution for further use in said process.

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