The alumina adsorbent has a very shallow adsorption capacity of water and other substances with strong molecular polarity. It has the characteristics of high adsorption capacity, low wear rate and strong water absorption capacity. The lowest dew point can reach -70℃. It is widely used in deep drying and harmful impurity treatment of various gas and liquid substances. Air separation cryogenic purifier water removal, air compressor water removal, nitrogen machine dehydration and other conditions.