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From the two adsorption curves below, while the adsorption pressure is increasing, the adsorption capacity of oxygen and nitrogen molecular by the absorbent increase together. But at certain point, the oxygen molecule reaches the adsorption balance point, which is faster than that of nitrogen molecule, resulting in their different characteristics to do the separation.
The nitrogen/oxygen PSA system bases on this characteristic of selectivity adsorption and utilizes two CMS/ZMS adsorption beds which are pressurized during working to adsorb the Oxygen/Nitrogen, and depressurized to regenerate. The alternating working cycle will continuously produce high purity gaseous nitrogen/oxygen.