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Selective removal of nitrogen from natural gas by pressure swing adsorption

  • US 6,444,012 B1
  • Filed: 10/30/2000
  • Issued: 09/03/2002
  • Est. Priority Date: 10/30/2000
  • Status: Expired due to Term
First Claim
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1. A pressure swing absorption (PSA) process for the separation of nitrogen from a mixture of the same with methane which comprises:

  • (a) passing a feed stream comprising said mixture in contact with a nitrogen-selective sorbent in a PSA unit so as to preferentially adsorb nitrogen and produce a methane-rich product stream containing at least 70 mol. % methane and a low pressure purge stream having a higher molar concentration of nitrogen than said mixture; and

    (b) subsequent to step (a), periodically heating said nitrogen-selective sorbent with the methane-rich product stream to drive off accumulated methane from such sorbent.

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