At present, carbon molecular sieves and zeolite molecular sieves are widely used in the field of nitrogen and oxygen production. The separation of oxygen and nitrogen by molecular sieves is mainly based on the different diffusivity of these two gases on the surface of molecular sieves. Carbon molecular sieve is a kind of carbon based adsorbent with the characteristics of activated carbon and molecular sieve. Carbon molecular sieves are composed of micropores with pore sizes ranging from 0.3 nm to 1 nm. The gas (oxygen) with smaller diameter diffuses faster and enters into the solid phase of molecular sieve more, which can obtain rich nitrogen. After a period of time, the adsorption of oxygen on molecular sieve reaches equilibrium. According to the adsorption characteristics of carbon molecular sieve to adsorbed gas under different pressures, reducing the pressure makes carbon molecular sieve release the adsorption of oxygen, which is called regeneration. Pressure swing adsorption (PSA) usually uses two parallel towers to alternately carry out pressure adsorption and decompression regeneration, so as to obtain continuous nitrogen flow.
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