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Landfill gas recovery

  • US 5,681,360 A
  • Filed: 01/11/1995
  • Issued: 10/28/1997
  • Est. Priority Date: 01/11/1995
  • Status: Expired due to Term
First Claim
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1. A process for separating carbon dioxide from a landfill gas feed stream containing carbon dioxide, methane and trace contaminants of relatively higher boiling gases, comprising the stepscompressing the landfill gas feed stream and removing water therefrom to produce a dehydrated gas stream containing said methane, carbon dioxide and trace contaminants,introducing said dehydrated gas stream into an absorption column means for absorbing said contaminants with a carbon dioxide absorbent primarily comprising said carbon dioxide present in said landfill gas stream,withdrawing from said absorption column means, at a first location, a spent absorbent stream containing no more than about 35% of the carbon dioxide contained in the landfill gas feed stream and substantially all of said gas contaminants, withdrawing from said absorption column at a second location above said first location, a carbon dioxide product stream substantially free of contaminants containing a substantial portion of the carbon dioxide originally present in said landfill gas feed stream, andalso withdrawing from said absorption column means a methane product stream substantially free of said contaminants and containing most of the methane originally contained in said landfill gas feed stream.

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