Modern gas purification activated alumina, water vapor and some of the liquid has the ability to selective adsorption. After removing the water saturation adsorption regeneration can be heated at about the recovery 175-315 ℃.regeneration of molecular sieves can be repeated rehabilitation. In addition to use as a desiccant, it can also adsorb vapors from contaminated lubricating oxygen, hydrogen, carbon dioxide, natural gas or the like. And are useful as catalysts and catalyst supports, and chromatography carrier. Modern water purification activated alumina is white spherical porous particles, particle size uniformity, smooth surface, high mechanical strength, moisture absorption, no swelling maintain the status quo does not crack after absorbing water, non-toxic, odorless, insoluble in water, ethanol, fluoride has a strong adsorption, mainly used in high fluoride areas of fluoride in drinking water.