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Scrubbing CO2 from methane-containing gases using an aqueous stream

  • US 6,667,347 B2
  • Filed: 09/14/2001
  • Issued: 12/23/2003
  • Est. Priority Date: 09/14/2001
  • Status: Active Grant
First Claim
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1. A method for removing CO2 from a gas stream, the method comprising:

  • a. contacting a gas stream, comprising methane and CO2, with an aqueous stream so that at least a portion of the CO2 in the gas stream is dissolved into the aqueous stream, creating a CO2-depleted gas stream having an enriched methane concentration and a CO2-enriched aqueous stream, wherein the aqueous stream is at a pressure greater than about atmospheric pressure and less than a pressure of a source of the gas stream and wherein the aqueous stream has a pH of at least about 7.0;

    b. separating the CO2-enriched aqueous stream from the gas stream; and

    c. disposing of the CO2-enriched aqueous stream in at least one of a marine environment, a terrestrial formation or combination thereof, wherein disposal of the CO2-enriched aqueous stream is done at conditions sufficient to ensure that at least about 75% of the CO2 removed from the gas stream remains dissolved in the aqueous stream.

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