Why does the desiccant heat up, and can the desiccant still be used when it heats up?

The heat-generating desiccant is quicklime desiccant. Because the main ingredient of quicklime desiccant is calcium oxide, when calcium oxide meets water, a sharp chemical reaction will occur to generate calcium hydroxide and generate a lot of heat in an instant.

1. Quicklime desiccant is used as a food desiccant because of its low cost and strong water absorption, and the lime desiccant will emit a lot of heat when it encounters water. Note that it may also reach the level of **, but two conditions must be met: first, the sealed space; The second is to generate a lot of heat.

When the lime heats up with water, it heats the air in the bottle, and the air expands to a certain extent, and the bottle will burst.

2. The desiccant in snacks is one of them, most of which use silica gel desiccant, because of its non-toxic, tasteless, non-corrosive, stable shape, good moisture absorption ability, etc., it is very common in recent years, and silica gel desiccant will not have any reaction when added to water.

Dingxing desiccant: the reason why the desiccant will heat up is the reason for the quicklime desiccant The main component of quicklime desiccant is calcium oxide, and its water absorption ability is achieved through chemical reaction, so the water absorption is irreversible.

The quicklime desiccant will release heat when a chemical reaction occurs while absorbing water, because there are only two kinds of chemical reactions in nature, one is endothermic (it cannot be carried out spontaneously, and a heating device is required for the reaction), and the other is exothermic (it can be carried out spontaneously). In fact, a lot of drying will produce heat more or less, when the desiccant absorbs water, when a chemical reaction occurs, it will release heat, and this is a slow reaction process, and the heat will be released slowly, so it is always hot.

If the desiccant is heated, it cannot be used continuously. The desiccant generates heat because it has been damp or has reacted with water vapor. At this time, the drying function of the desiccant has been greatly reduced, or even completely ineffective, so that it can no longer be used.

Therefore, when packaging desiccant, if it is found that the desiccant is already heated, it is best not to continue packaging.

Desiccants are substances that can remove water from moist substances. It is often divided into two categories: 1. Chemical desiccant, such as calcium sulfate and calcium chloride, etc., are dried by combining with water to generate hydrates; 2. Physical desiccant, such as silica gel and activated alumina, is dried by physical adsorption of water.

The control of moisture is closely related to the yield of the product.

In the case of food, under proper temperature and humidity, bacteria and moulds in food can multiply at an alarming rate, causing spoilage, moisture and discoloration. Electronic products can also cause metal oxidation due to excessive humidity, resulting in defective products. The use of desiccant is to avoid the occurrence of defective products caused by excess moisture.

The main ingredient of quicklime desiccant is calcium oxide, when calcium oxide meets water, a sharp chemical reaction will occur to generate calcium hydroxide, and a large amount of heat will be generated in an instant, causing water to become water vapor. If such a desiccant is placed into a sealed plastic bottle, the water vapor will cause the bottle to expand dramatically, and the increasing pressure will eventually lead to the plastic bottle**.

Generally, the main agitation of desiccant is quicklime desiccant and silica gel desiccant, which will have different heating phenomena.

Quicklime is calcium oxide (a white solid powder can be seen when the bag is opened), and it undergoes an exothermic reaction with water to produce calcium hydroxide, which is hydrated lime. Obviously, when there is more moisture in the wild sedan chair, the heat release will be more obvious. In addition, there are also desiccants that basically do not exothermic, and there is a certain margin for selection for different products.

Once the water molecules enter, it will expand, and after expansion, there will be friction between the silica gel, and heat will be generated, which is normal, indicating that the desiccant has a good hygroscopic effect.

1. The desiccant cannot be used if it is heated. The main ingredient in the desiccant is lime, if there is a heat phenomenon, the rotten car indicates that it has reacted with air and moisture, and the desiccant is basically invalid at this time.

2. The desiccant is heated because its water absorption process is an exothermic process, when the desiccant is combined with water, physical changes and chemical changes often occur at the same time, and this process will naturally be accompanied by the release of heat history.

3. The desiccant contains many chemical components, and the types of desiccant are also different, but its function is basically used to prevent moisture, and this kind of thing is generally relatively safe to hold, but if there is improper operation, it may also cause some bad accidents.

1. The desiccant cannot be used if it is heated. The main ingredient in the desiccant is lime, if there is a heat phenomenon, it means that it has reacted with air and moisture, and the desiccant is basically ineffective at this time.

2. The desiccant is heated because its water absorption process is an exothermic process, when the desiccant is combined with water, physical changes and chemical changes often occur at the same time, and this process will naturally be accompanied by the release of heat.

3. The desiccant contains many chemical components, and the types of desiccant are also different, but its function is basically used to prevent moisture, and the use of this kind of thing is generally safer, but if the operation is improper, it may also cause some bad accidents.