Technical article

Types of chemical adsorbents (II)

2021-10-08

Activated alumina
Definition: Its main component is aluminum powder, which is a crystal of hydroxide and has high activity, so it is also called activated alumina. Activated alumina has a strong affinity for water, so it is an adsorbent for deep drying of trace water. And under certain operating conditions, its drying depth can reach below -60 degrees Celsius dew point. At the same time, it is also one of the preferred desiccants for air compression dryers -- air dryer desiccants.
Silica gel
Definition: Silica gel is a hydrophilic polar adsorbent. It uses sulfuric acid to treat the water solubility of sodium silicate to form a gel, and after washing it with water to remove sodium sulfate, it undergoes a drying process to obtain transparent silica gel. It is mainly used for drying, separation of gas mixtures, etc. Industrial silica gel is divided into two types: coarse pores and fine pores silica gel. Under relative humid and saturated conditions, the adsorption capacity of coarse-pored silica gel can reach more than 80%; but under low temperature conditions, the adsorbent is much lower than that of fine-pored silica gel.
Our common silica gel is divided into white silica gel, orange silica gel, blue silica gel, water resistant (WS type) silica alumina gel and H type silica alumina gel -- alumina gel formula. The type of silica gel can be selected according to different application.
Activated carbon
Definition: The main raw material of activated carbon is almost all carbon-rich organic matter, which can be made by carbonizing and activating carbon raw materials such as charcoal, fruit shells, and coal. It is mainly used to purify water and gas for chemical, electronic, metallurgical, chemical, gold and other industries.

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Tracy Chen
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