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What are the commonly used desiccants?

Desiccant refers to an item that can remove moisture from moist substances. It is usually used for moisture-proof packaging, such as cameras and photosensitive materials, precision instruments/electrical appliances, food, medicine, shoes, clothes, leather, weapons, Telecommunication equipment, etc. or air dehumidification, such as closets, cabinets, floors, musical instruments, etc. in the home. So what are the common desiccant materials? The editor of the humidity card summarizes the following 8 types:

1. Activated alumina: large water absorption, fast drying speed, and renewable;

2. Anhydrous sodium sulfate: the drying temperature must be controlled within 30℃, which is worse than anhydrous magnesium sulfate;

3. Calcium sulfate: can dry H2, O2, CO2, CO, N2, Cl2, HCl, H2S, NH3, CH4, etc.;

4. Color-changing silica gel: It is often used to keep instruments and balances dry. It turns red after absorbing water. The expired silica gel can be used after drying and regeneration. Can dry amine, NH3, O2, N2, etc.;

5. Anhydrous magnesium sulfate: It has a strong drying ability and generates MgSO4.7H2O after absorbing water. It has rapid water absorption, high efficiency and low price, making it a good desiccant. Commonly used to dry organic reagents;

6, solid sodium hydroxide and soda lime: fast water absorption, high efficiency, low price, is an excellent desiccant, but can not be used to dry acidic substances. Commonly used to dry gases such as hydrogen, oxygen and methane;

7. Concentrated H2SO4: With strong water absorption, it is often used to remove moisture in gases that do not react with H2SO4. For example, it is often used as a desiccant for H2, O2, CO, SO2, N2, HCl, CH4, CO2, Cl2 and other gases;

8. Anhydrous calcium chloride: It is widely used because of its low price and strong drying ability. The drying speed is fast, it can be regenerated, and the dehydration temperature is 473K. Generally used to fill dryers and drying towers, dry medicines and various gases. Cannot be used to dry ammonia, alcohol, amine, acyl, ketone, aldehyde, ester, etc.

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