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Pressure swing adsorption process

  • US 6,497,750 B2
  • Filed: 02/26/2001
  • Issued: 12/24/2002
  • Est. Priority Date: 02/26/2001
  • Status: Expired due to Term
First Claim
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1. A pressure swing adsorption (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 to a first PSA unit containing a nitrogen selective adsorbent so as to preferentially adsorb nitrogen and produce a product stream containing at least 90 mol % methane and a purge stream;

    (b) recovering said product stream;

    (c) passing said purge stream to a second PSA unit containing a methane selective adsorbent so as to produce a product stream rich in nitrogen and a purge stream rich in methane;

    (d) recovering said nitrogen-rich product stream; and

    (e) treating said purge stream rich in methane so as to remove heavy hydrocarbons from said purge stream rich in methane.

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