PSA technology is a new gas adsorption separation technology, which has the following advantages:

(1) The purity of the product is high.

(2) it can work at room temperature and low pressure without heating the regeneration bed, which is energy-saving and economical.

(3) the equipment is simple and easy to operate and maintain.

(4) continuous circulation operation can realize automation completely.

Therefore, as soon as this new technology comes out, it has attracted the attention of the industrial circles of various countries, and has developed rapidly and matured gradually. According to the characteristics that the equilibrium adsorption capacity of adsorbent increases with the increase of component pressure, the operation methods of pressure adsorption and decompression desorption are carried out. Adsorption is an exothermic process and desorption is an endothermic process. However, as long as the concentration of adsorbate is small, the adsorption heat and desorption heat are not large, so PSA can still be regarded as isothermal process. Pressure swing adsorption (PSA) is usually operated at room temperature without heating, so it has a short cycle and is easy to realize automation. It is especially suitable for large-scale gas separation production process.