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Production of a nitrogen-rich product gas from pressure swing adsorption (PSA) using air feed with carbon molecular sieve (CMS) adsorbents is performed on a commercial basis in a typical two-bed PSA system. The performance of a process (as measured by product rate and nitrogen yield) is found to change with the different methods of repressurizing the beds after regeneration. The performance increases when the adsorbent beds are repressurized t o production pressure by feed gas alone fed a t an initially slow rate followed by a period with a rapid-feed second stage. An increase of performance is also noticed when repressurization is done by backfilling with product gas to an intermediate pressure and then adding feed gas as described above.

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