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Air separation by pressure swing adsorption with a high capacity carbon molecular sieve

  • US 5,240,474 A
  • Filed: 01/30/1992
  • Issued: 08/31/1993
  • Est. Priority Date: 01/23/1991
  • Status: Expired due to Fees
First Claim
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1. In a process for separating air for nitrogen recovery by pressure swing adsorption, the improvement for achieving enhanced nitrogen recovery which comprises using as an adsorbent in said process a carbon molecular sieve having an oxygen volumetric capacity of at least 9.0 cc/cc at 20°

  • C. and 1 atmosphere which sieve is made from a granular coconut shell char formed by;

    (a) crushing and sizing raw coconut shells to form shell granules having a size suitable for use in an adsorbent bed for pressure swing adsorption,(b) heating said granules in a flowing stream of inert gas at an average temperature ramp rate of about 2°

    C. to 12°

    C. per minute to a peak temperature of 775°

    to 900°

    C,(c) holding said peak temperature for a period of time so that the total heating and holding steps total not less than 1 hour nor more than 8 hours to produce granular char,(d) cooling said granular char in an inert gas atmosphere, and(e) recovering said product of step (d).

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