Make an oxygen generator, how to separate nitrogen and oxygen, and explain the working principle.

The principle of industrial oxygen generator is to use air separation technology to compress air at high density, then use the difference of condensation points of various components in the air to separate gas from liquid at a certain temperature, and then further rectify. The working principle of domestic oxygen generator: adopting molecular sieve physical adsorption and desorption technology. The molecular sieve is filled in the oxygen generator, which can adsorb nitrogen in the air when pressurized, and the remaining unadsorbed oxygen is collected and purified into high-purity oxygen. At present, PSA (pressure swing adsorption) air separation oxygen production technology is mostly used in medical oxygen generators, and the separation of oxygen and nitrogen is realized by using the difference of adsorption ability of attractant (zeolite molecular sieve) to oxygen and nitrogen in the air. When air enters the bed filled with adsorbent, nitrogen has strong adsorption capacity, and oxygen will not be adsorbed, so high concentration of oxygen can be obtained at the outlet end of the adsorption bed. Because the adsorption capacity of adsorbent changes with pressure, changing its pressure can make adsorption and desorption alternate.