The Activated Alumina is a highly porous, granular form of aluminium oxide having preferential adsorptive capacity for moisture and odor container in gases and some liquids. When saturated, it can be regenerated by heat (176o – 325oC). The cycle of adsorption and reactivation can be repeated many times.
GAS DRYING Gases that can be dried by activated aluminas are Acetylene, Air, Ammonia, Argon, Carbon dioxide, Chlorine, Cracked gas, Ethane, Ethylene, Freon, Furnace gas, Helium, Hydrogen, Hydrogen Chloride, Hydrogen Sulfide, Methane, Natural gas, Nitrogen, Oxygen, Propane, Propylene, Sulphur dioxide etc.
LIQUID DRYING Liquids that can be dried by activated alumina are Benzene, Butadiene, Butane, Butyl acetate, Carbon tetrachloride, Chlorobenzene, Cyclohexane, Ethyl acetate, Freon, Gasolines, Heptane, Hexane, Hydraulic oils, Jet fuel, kerosene, Lubricating oils, Naphtha, Nitrobenzene, Pentane, Pipe line products , Propane, Propylene, Styrene, Toluene, Transformer oil, Vegetable oil, Xylene, etc.
As a desiccant, activated aluminas is capable of removing significant amount of water from liquids and essentially, all water from gases. As a absorbent activated alumina can perform variety of services such as removing oil vapours from compressed gases, removing acids from lubricating oils or refrigerants, removing fluorides from water etc. Polar molecules, such as water and alcohols are highly adsorbed by activated aluminas, white nonpolar gases such as nitrogen and argon are at the low end of the adsorption scale.