The working principle of adsorption tower is based on the difference in adsorption capacity of adsorbents (such as activated carbon, molecular sieve, silica gel, etc.) for different substances. When the mixture passes through the adsorption tower, the target substance is adsorbed by the adsorbent, thus achieving the purpose of separation or purification. After adsorption saturation, the adsorbent can usually be regenerated and reused through desorption operation. It can perform functions such as purification and separation, material recovery, and product purification.