What are the characteristics of calcium chloride desiccant?

Release Time：

2021-02-26

Calcium oxide is also an alkaline desiccant, which can be used to dry alkaline gases but not acidic gases. It can be used to remove acidic impurities from the air, but not alkaline impurities. CaCl2, after combining with water, can be heated and vacuum-dried in a vacuum drying oven to recover the desiccant. Activated carbon desiccant relies on physical adsorption, adsorbing water molecules through the tiny pores on the surface of the activated carbon. It can be used to dry acidic or alkaline substances without any reaction. Activated carbon can also be recovered by heating in a vacuum drying oven.

Calcium is also alkaline Desiccant It can be used to dry alkaline gases, but not acidic gases. It can be used to remove acidic impurities from the air, but not alkaline impurities. CaCl2, after combining with water, can be heated and vacuum-dried in a vacuum drying oven to remove moisture and recover it. Activated carbon desiccant relies on physical adsorption, adsorbing water molecules through the tiny pores on the surface of the activated carbon. It can be used to dry acidic or alkaline substances without any reaction.

Activated carbon can also be recovered by heating in a vacuum drying oven. However, because calcium chloride Desiccant absorbs water through a chemical reaction, while activated carbon desiccant uses physical adsorption, CaCl2 absorbs water quickly and strongly, making it suitable for demanding, precise environments. The downside is that it is limited to gases of certain acid-base properties, and the adsorption of water molecules rapidly releases a large amount of heat, along with considerable hydrochloric acid gas. Furthermore, calcium chloride reacts with water to form a strong alkaline substance. It cannot be stored in glass reagent bottles for long periods and must be stored in plastic bottles. As described above, calcium chloride is more dangerous to use, easily causing corrosion, burns, and explosions. Its use is not recommended for those without professional training and knowledge.

　　Activated carbon uses physical adsorption, is highly inert, and has no restrictions on the container; only the environment's oxidizability and temperature need to be controlled. The adsorption process is gentle and presents almost no danger (avoid accidental ingestion). However, its binding force is weak, and its speed is not as fast as calcium chloride. It is not recommended for drying precision instruments (such as cameras and mobile phones).

　　In addition, the appearance of calcium chloride changes significantly after absorbing water, making it easy to determine whether it can be used further. However, activated carbon shows no change in appearance after absorbing water, which may lead to the continued use of deactivated activated carbon.

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