According to the adsorption characteristics of molecular sieve, there are two kinds of air purification process, one is pressure swing adsorption molecular sieve purification process, the other is temperature swing adsorption molecular sieve purification process. Pressure swing adsorption can simplify the process, save air cooling column, low temperature water pump, regeneration heater and other equipment, and save steam. However, its disadvantages can not be ignored, such as short switching cycle, frequent valve action which could cause default, high switching loss, increased energy consumption, adsorption is not completely compared with temperature swing adsorption, which has an impact on the safety of large-scale air separation, and the total investment is slightly greater than that of temperature swing adsorption. Therefore, we mostly use the temperature swing adsorption molecular sieve purification process.
