Functions of Activated Alumina

Owing to its advantages of large specific surface area, adjustable pore structure, excellent adsorption performance, surface acidity and good thermal stability, activated alumina is widely used as an adsorbent, water purifier, catalyst and catalyst support in fields such as pharmaceuticals, chemical engineering, metallurgy, water purification, chemical analysis and waste gas treatment. It plays a particularly important role in reaction processes including petroleum hydrocracking, hydrofining, hydroreforming, dehydrogenation and automobile exhaust purification.

1.Applications of Activated Alumina in the Adsorption Field

As an adsorbent constitutes one of the primary applications of activated alumina, which is mainly attributed to its numerous favorable properties such as large specific surface area, rational pore structure, excellent physical properties and good chemical stability. Its major industrial applications include gas drying, liquid drying, water purification treatment, and selective adsorption in the petroleum industry.

2.Applications in Water Purification

The application of activated alumina in the water purification field has been developing rapidly. Its water treatment applications mainly focus on fluoride removal, decolorization, odor elimination and phosphate removal.

3.Applications in Gas Drying

Owing to its strong affinity for water, activated alumina exhibits excellent performance in drying moisture from gases. It is capable of drying more than twenty types of gases, including acetylene, hydrogen, oxygen, air and nitrogen.

4.Applications in Liquid Drying

Liquid drying is far more complex than gas drying, and the requirements for desiccants are relatively higher. First, no chemical reactions shall occur between the components of the liquid, or between the liquid and the adsorbent during their contact. Second, the substances adsorbed during liquid drying must be removable via rinsing during the regeneration process. At present, the liquids proven to be dryable by activated alumina include aromatic hydrocarbons, high-molecular olefins, gasoline, kerosene and the like.

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