Nitrogen-enriched air

Air O2/N2 Nitrogen-enriched air as inerting atmosphere Oxygen-enriched air for combustion enhancement Home medical oxygen enrichment for respiration therapy Practical to 99.5% Various degrees of enrichment up to 50% O2 Successful, but small market Need more selective membranes to reach higher nitrogen purity More selective membranes improves economics None... 

A commercial nitrogen enrichment system is illustrated in Fig. 17. Hollow-fiber membrane modules are connected to a compressed air feed at 70-150 psi. The feed in usually to the bore side of the hollow fibers. Oxygen (and water vapor that may be present) permeate out of the fiber into the shell and exit at low pressure. Dry, nitrogen-enriched air... 

Nitrogen Enriched Air occurs as a colorless gas. It is produced from air in situ by physical separation methods. It contains not less than 90% and not more than 99% nitrogen, by volume. The remaining components are noble gases and, primarily, oxygen. 

Labeling Where the gas is piped from cylinders or directly from the collecting tank to the point of use, label each outlet Nitrogen Enriched Air. ... 

S. Nemser, D. Stookei J. Nelson, Diesel Engine NO Reduction via Nitrogen-Enriched Air. Fluid/Particle Separation Journal, Vol 15, No. 1, 2004, p. 69-80. 

Separation can be effectedto obtain both oxygen-enriched air and nitrogen-enriched air. Kitrogen-enricbed air (95 - 99.9%) can be used as an inen gas in the blanketing of fud tanks, and in the storage of food and agriculmral products. 

Recently, Ekiner and Simmons reported on membranes for the production of oxygen-enriched air, nitrogen-enriched air, for the separation of carbon dioxide from hydrocarbons, and the separation of hydrogen from various petrochemical and oil refining streams [82]. The membranes are made with blends of PAs, Pis and PI-PAs. They show high strength, chemical resistance, and are suitable for high pressure and temperature applications. 

What is clear from this example is that, as the value of the stage cut, 0, increttses, the permeate mole fraction of O2 in the oxygen-enriched air (OEA) decreases and the mole fraction of N2 in the retentate (the nitrogen-enriched air... 

Example 7.2.2 We wish to estimate the membrane area required to produce nitrogen-enriched air having xti.fiL = 0.95 using a silicone rubber-coated hollow fiber membrane, with (QN m/ m) at 25 °C = 4.6 x 10 gmol/s-cm -cm Hg and =2.1. The feed air is introduced at... 

POLYMERIC MEMBRANE MATERIALS AND POTENTIAL USE IN GAS SEPARATION (a) Nitrogen-Enriched Air... 

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