Patent ID: 6835231
Filing Date: 2004-12-28
Classification: B01D,B67D,C01B

Abstract:
A process for the production of nitrogen gas comprising the steps of: feeding compressed air to an adsorber cylinder (2) containing a plurality of adsorbent means for removing oxygen from said air until said adsorber cylinder is pressurized; feeding product gas flow exiting said cylinder (2) to a collecting reservoir (3); depressurising said adsorber cylinder to regenerate said adsorbent means and cyclically repeating said steps, characterized in further comprising the steps of: calculating the amount Q1 of nitrogen gas obtainable from said adsorber cylinder with the required purity at pressure Pp of the cylinder; bringing said cylinder to a pressure value at least equal to said pressure Pp and in any case exceeding the pressure present in said collecting reservoir; and transferring in each cycle from said adsorber cylinder (2) to said reservoir (3) a fixed gas amount Q2, where Q1&gE;Q2.