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What is the principle of calcium chloride as a desiccant?
2022-03-18
The smaller the ion of alkali metal and alkaline earth metal, the more charge it has, the stronger the electric field acting on the water molecule, the easier it is to carry crystal water, and the salt of alkaline earth metal is more likely to carry crystal water than the salt of alkali metal. Therefore, the salt of alkaline earth metal is hygroscopic, and the deliquescence of ordinary salt is caused by the absorption of water by the impurity MgCl2. Ca belongs to alkaline earth metal, so calcium chloride has strong water absorption and can be used as a desiccant.

Calcium chloride is a salt composed of chlorine and calcium. It is a typical ionic halide with strong hygroscopicity.

In addition to being used as a desiccant, what else can calcium chloride be used for?

1. Oil drilling, exploratory well working fluid, completion fluid, petrochemical dehydration fluid;

2. It can be used as a snow melting agent, using the properties of calcium chloride to melt heat dissipation and low freezing point as a road deicing agent and snow melting agent;

3. Refrigerant, calcium chloride is an important refrigerant for refrigerators and ice making;

4. As an antifreeze agent, it can accelerate the hardening of concrete and enhance the cold resistance of building mortar. It is an excellent building antifreeze agent;

5. Precipitation agent, which is the precipitation agent for producing lake pigments;

6. Coagulant, used as latex coagulant in rubber industry, etc. 
 
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