Oxygen enriched air generation system

  • US 5,846,291 A
  • Filed: 03/17/1997
  • Issued: 12/08/1998
  • Est. Priority Date: 08/22/1995
  • Status: Expired due to Term
First Claim
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1. Method for generating high pressure oxygen enriched air having a predetermined oxygen content comprising the steps of:

  • a) providing a high pressure gas stream of air containing nitrogen and oxygen;

    b) reducing the pressure of the gas stream, with cooling, to below 600 p.s.i.g.;

    c) adjusting a temperature of the reduced pressure gas stream to a preselected value;

    d) introducing the pressure reduced, temperature adjusted gas stream into an inlet of a separation chamber containing a permeable nitrogen-oxygen separation membrane system and having two outlets, one outlet on an inlet side of the membrane system and another outlet on an opposite side of the membrane system;

    e) withdrawing a first gas stream containing substantially nitrogen from the one outlet of the separation chamber;

    f) withdrawing a second gas stream containing oxygen enriched air at a pressure from 0.5 to 5 p.s.i.g. from the other outlet of the separation chamber;

    g) monitoring the oxygen content of the second gas stream;

    h) controlling operating conditions of the separation chamber to obtain the second gas stream having the predetermined oxygen content; and

    i) compressing the second gas stream to a high pressure.

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