Molecular sieve desiccant is a synthetic product with strong adsorption on water molecules. The pore size of molecular sieve can be controlled by different processing technologies. In addition to adsorbing water vapor, it can also adsorb other gases. For example, it can still contain water molecules well at high temperatures above 230 ℃.

Molecular sieve desiccant is a kind of aluminosilicate compound. Its cubic lattice is mainly connected by silicon and aluminum through oxygen bridge to form an empty skeleton structure, in which there are many evenly spaced holes and well arranged holes with large internal surface area. In addition, it also contains metal ions and combined water with low electricity price and large ion radius. Because water molecules are constantly lost after heating, but the crystal skeleton structure remains unchanged, many cavities of the same size are formed. The cavities are connected by many holes with the same diameter. These small cavities have uniform diameters, which can adsorb channels smaller in diameter than molecules into the cavity, while molecules larger than channels are excluded, so that the shapes with different molecular diameters and different molecular polarities can be made, It will have different boiling points and molecules with different saturation will be separated, that is, it has the function of "screening" molecules, so it is called molecular sieve. Molecular sieves are widely used in metallurgical, chemical, electronic, petrochemical, natural gas and other industries.
Molecular sieves have strong hygroscopic capacity and are used for gas purification treatment. Direct contact with air should be avoided during storage. Molecular sieves with long storage time and moisture absorption shall be regenerated before use. Try to avoid contact with oil and liquid water. In industrial production, air, hydrogen, oxygen, nitrogen and argon are used for drying. Two adsorption dryers are used in parallel, one of which works and the other can be regenerated to ensure the continuous operation of the equipment. The working temperature of the dryer is 8-12 ℃, and the regeneration temperature is 350 ℃. The regeneration temperature of different molecular sieves is slightly different. Molecular sieves have a good catalytic effect on some organic gas reactions.