1. Concentrated H2SO4: It has strong water absorption and is often used to remove moisture from gases that do not react with H2SO4. For example, china Moisture Absorber is often used as H2, O2, CO, SO2, N2, HCl, CH4, CO2, Cl2 and other gases.

2. 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. It is generally used to fill dryers and drying towers, drying medicines and various gases. Cannot be used to dry ammonia, alcohol, amine, acyl, ketone, aldehyde, ester, etc.
3. Anhydrous Magnesium Sulfate: It has strong drying ability and generates MgSO4.7H2O after absorbing water. It has rapid water absorption, high efficiency and low price, and is a good desiccant. Often used to dry organic reagents.
4. Solid sodium hydroxide and soda lime: fast water absorption, high efficiency and low price, are excellent desiccants, but cannot be used to dry acidic substances. The party is used to dry gases such as hydrogen, oxygen, ammonia and methane.
5. Color-changing silica gel: It is often used to keep instruments and balances dry. It turns red when it absorbs water. The expired silica gel can be used after drying and regeneration. Amines, NH3, O2, N2, etc. can be dried.
6. Activated alumina (Al2O3): large water absorption, fast drying speed, and can be regenerated (400-500K baking).
7. Anhydrous sodium sulfate: The drying temperature must be controlled within 30 °C, and the drying performance is worse than that of anhydrous magnesium sulfate.
8. Calcium sulfate china Moisture Absorber: It can dry H2. O2. CO2. CO, N2. Cl2, HCl, H2S, NH3, CH4, etc.