PROCESS FOR RECOVERING OXYGEN ENRICHED GAS

摘要

A process for recovering an oxygen enriched gas from a mixed gas mainly composed of nitrogen gas and oxygen gas by means of Pressure Swing Adsorption (PSA) which comprises: providing two adsorbers A and B packed with a zeolite molecular sieve as the adsorbent and a gas reservoir for accumulating the recovered oxygen enriched gas which is connected to the outlet side of each adsorber and used in common to both adsorbers, introducing the mixed gas into adsorber A to adsorb nitrogen gas, and desorbing nitrogen gas previously adsorbed in adsorber B therefrom under reduced pressure, said introduction, adsorption and desorption being carried out according to adsorption, desorption, rinsing, recovering, pressure accumulation and pressurization steps in turn with alternation of adsorbers A and B.