Activated alumina is an efficient desiccant that absorbs moisture from air, gases, and liquids to address moisture-related issues such as corrosion, mould growth, and electronic component degradation. With its porous structure providing ample surface area for absorption.
Made from bauxite ore, aluminum oxide is created through a process called calcination that involves extracting water molecules to transform aluminum hydroxide into alumina. Next comes activation which alters its phase composition, texture and absorption characteristics.
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Activated Alumina Desiccant features a large surface area which enables it to absorb large volumes of moisture. 此外, its thermal shock- and abrasion-resistance makes it suitable for industrial applications while its chemical compatibility allows it to work well with various gases and liquids, including those used in compressed air systems to prevent corrosion and rust as well as those produced by the petrochemical industry to remove moisture from gas streams.
Activated alumina desiccant differs significantly from silica gel in that its porous structure allows for an immense internal surface area and controlled pore sizes; manufacturers can tailor its production process accordingly for maximum flexibility in creating desiccants with various adsorption characteristics.
Alumina beads boast uniform size and shape that helps them stabilize a bed and reduce dusting. Their uniform size also helps prevent channeling in systems and reduce pressure drops; making alumina an excellent choice for air drying and compressed gas drying applications.
High adsorption capacity
Activated alumina has an exceptional adsorption capacity, making it the ideal material to remove large volumes of moisture quickly. 此外, its performance in high humidity environments makes it an excellent option when environments may vary drastically; furthermore, activated alumina’s thermal stability means it can withstand higher temperatures without losing its absorption capabilities.
Active Alumina’s high adsorption capacity stems from its structure, with its numerous pores. Water molecules attract to this material’s polar surface and adhere to it until equilibrium has been reached; this process can be utilized across various industries such as air drying, compressed air systems and dehumidification.
[68,76] demonstrated that acid and alkaline modifications of g-Al2O3 desiccants improved their adsorption characteristics significantly, particularly those based on bayerite. Their study also revealed that acid modification reduced average pore sizes while increasing surface acidity; however it had no discernible impact on phase composition, texture or absorption capacity of these adsorbents; in comparison, bayerite acidification drastically shifted these parameters.
Low water absorption rate
Activated alumina is widely used as a desiccant to remove moisture from gases and liquids, thanks to its exceptional absorption properties. This versatile product has applications across compressed air systems, dehumidification systems, petrochemical processing facilities and prevent corrosion on industrial equipment.
Activated alumina is a highly porous form of aluminium oxide produced through controlled activation and dehydration of aluminium hydroxide. By altering temperature, time, or impurity content during activation, activated alumina granules with distinct surface areas or pore diameters may be produced.
Alumina balls and molecular sieves possess vastly differing adsorption characteristics; molecular sieves excel at absorbing moisture from liquids while alumina is better at drying air and other gases. Both materials possess the ability to adsorb moisture at different temperatures; this makes them suitable for different environments and conditions. Their capacity can even be increased through chemical modification by adding acids or bases onto their surface for enhanced absorption capacity.
High thermal stability
Activated alumina is an extremely durable material with wide temperature ranges and superior moisture adsorption capacities, often used by pharmaceutical and chemical industries for moisture removal/purification applications such as compressed air dryers, gas drying systems and dehydration processes.
Hydrophobic carbon’s unique adsorption properties enable it to adsorb hydrogen sulfide and volatile organic compounds (VOCs) present in industrial process streams, mitigating emissions while improving environmental standards and mitigating harmful emissions. 此外, its versatility also makes it suitable for water filtration or chromatographic separation techniques.
Alumina balls boast superior thermal stability and can withstand harsh environments, making them the ideal solution for industrial applications involving heat or chemicals. 此外, these balls comply with stringent industry regulations to guarantee they are safe to use regardless of environment or process.
Alumina beads differ from other desiccants by having an exceptionally wide surface area and acting as their own adsorbents, capable of capturing water vapor via both chemical absorption and dissociative adsorption – when one water molecule interacts with aluminium oxide molecules – similar to molecular sieves. Their absorption capacity varies, however.
High strength
One of the primary strengths of activated alumina is its impressive adsorption capacity, making it ideal for environments with variable humidity levels. It contains large networks of pores which absorb water molecules from its surroundings to maintain consistent performance under all circumstances. 此外, activated alumina offers high thermal stability to withstand processes without losing its absorption capabilities.
Activated alumina is widely utilized as a desiccant in various industrial settings to remove moisture from air and gases, particularly compressed air systems where moisture accumulation could damage equipment or cause corrosion. 此外, its selective adsorption properties allow users to purify gases and liquids by eliminating contaminants such as hydrogen sulfide, arsenic and volatile organic compounds from these processes.
Molecular sieve is vulnerable to being damaged by high temperatures; activated alumina stands up better. 此外, its adsorption efficiency remains more reliable at higher temperatures compared to other desiccants; its capacity can even reach 20% of its weight in water depending on environmental and usage conditions.