Activated Alumina Spheres for Industrial Gas Drying and Purification

Activated alumina spheres are a white, spherical, and porous granular material composed of aluminum oxide (Al₂O₃). Characterized by

 a high specific surface area, strong adsorption capabilities, high mechanical strength, and excellent thermal stability, they are primarily

 utilized as desiccants, adsorbents (particularly for fluoride removal in drinking water), and catalyst supports.

Activated alumina spheres—also referred to as activated alumina ceramic spheres—are defined by their unique physical structure.

 Produced through the thermal dehydration of aluminum hydroxide, their primary crystalline phase is γ-Al₂O₃. The product typically

 presents as white (or faintly reddish) spheres with uniform particle size and a smooth surface. Its inherent porosity and highly

 dispersed structure endow it with an immense specific surface area (typically no less than 280 m²/g, with industrial-grade products

 often exceeding 300 m²/g) and an abundance of capillary channels; these attributes form the fundamental basis for its exceptional

 adsorption and catalytic properties.

Products designed for different applications prioritize specific parameters and are organized into distinct model series:

Key Models Classified by Function:

1.KA401 Adsorbent** and **KA406 Air Separation Adsorbent:** These models prioritize high specific surface area and static water

 adsorption capacity, and are used for the deep drying of gases.

2.KA402 Fluoride Remover:** Specifically designed for the removal of fluoride from drinking water, exhibiting selective adsorption

 capabilities toward fluoride ions.

3.KA403 Hydrogen Peroxide Grade** and **KA404 Chloride Remover:** Used for the purification of working fluids and the removal of

 impurities within specific chemical processing streams.

KA405 Catalyst Support:** Requires excellent thermal stability and a suitable pore structure to serve as a carrier for active catalytic

 components.

**Core Physical Characteristics:**

1.High Mechanical Strength:** Compressive strength increases with particle size; for instance, with a particle size of 3–5 mm, the

 compressive strength typically exceeds 100 N per particle, ensuring resistance to abrasion and deformation within industrial

 equipment.

2.Deep Drying Capability:** Exhibits strong affinity for polar molecules such as water; drying depth can reach dew points ranging from

 -40°C to below -70°C, making it highly suitable for use in heatless regeneration systems.

3.Regenerability:** Once adsorption saturation is reached, the material can be regenerated—allowing for multiple reuse cycles—by

 heating it to temperatures between 175°C and 400°C to desorb the adsorbed water or impurities.

**Key Application Areas**

Leveraging its unique properties, activated alumina spheres play a pivotal role across various industrial sectors:

**Deep Drying of Gases and Liquids:** Widely utilized for the drying of over twenty types of gases—including petroleum cracking gas,

 ethylene, propylene, natural gas, air, oxygen, and hydrogen—as well as liquids such as aromatics, gasoline, and kerosene. In fields

 such as air separation, instrument air systems, and chemical processing, it ensures that process gases meet stringent low-dew-point

 requirements.

**Water Purification:** It is the material of choice for the removal of fluoride from high-fluoride drinking water, boasting a fluoride

 adsorption capacity of up to 6,400 grams per cubic meter. Furthermore, it can be employed to remove other harmful substances from

 water, such as arsenic and phosphides.

**Catalysts and Catalyst Carriers:** Due to its high thermal stability, oxidation resistance, and stable physicochemical properties, it is

 extensively used as a catalyst carrier in processes such as petroleum refining (e.g., hydrocracking and desulfurization), chemical

 synthesis, and automotive exhaust purification.

**Waste Gas Purification and Other Applications:** It can be used to remove pollutants such as hydrogen sulfide, sulfur dioxide, and

 hydrogen fluoride from waste gases; recent technological advancements have also enabled its application in the removal of phosphine

 under high-temperature conditions. Additionally, it serves as a deacidifying agent for transformer oil and as a specialized adsorbent in

 the production of hydrogen peroxide.