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Process for separating nitrogen from less polar compounds

  • US 6,336,956 B1
  • Filed: 09/27/1996
  • Issued: 01/08/2002
  • Est. Priority Date: 03/24/1995
  • Status: Expired due to Fees
First Claim
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1. A process for separating nitrogen from a gas mixture containing nitrogen and at least one gas which is less polar than nitrogen, and employing a technique of differential adsorption of the gases, called PSA process, using an adsorbent of zeolite type, according to which the PSA process is used at a temperature greater than 50°

  • C. by employing as adsorbent a zeolite whose nitrogen adsorption isotherm at 20°

    C. exhibits a curvature characterized by a parameter C defined by the formula;

    C=P1

    q

    (P2)
    P2

    q

    (P1)
    embedded imagewhere q(P1) denotes the quantity of nitrogen adsorbed at pressure P1 andq(P2) that adsorbed at pressure P2, and the pressures P1 and P2 are defined respectively from the high and low pressures of the PSA cycle in question, C being at least equal to 2.9.

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