Molecular sieve 4A

The pore diameter of molecular sieve 4A is 4 angstroms (Å). It can adsorb water, methanol, ethanol, hydrogen sulfide, sulfur dioxide, carbon dioxide, ethylene, and propylene, but does not adsorb any molecules with a diameter larger than 4 angstroms (Å) (including propane). Its selective adsorption performance for water is higher than that for any other molecules. It is one of the most widely used molecular sieve varieties in industry. Wholesale of molecular sieves.

Molecular sieve 4A is an alkali metal aluminosilicate that can adsorb molecules with a critical diameter not larger than 4 angstroms (Å), such as water, NH3, H2S, sulfur dioxide, carbon dioxide, C2H5OH, C2H6, C2H4, etc. It is widely used for the drying of gases and liquids, and can also be used for the refining and purification of certain gases or liquids, such as the production of argon.

Molecular sieves are artificially synthesized aluminosilicates with a microporous cubic lattice. They adsorb or repel molecules of different substances according to the size of the cavities inside their crystals, so they are called "molecular sieves". Substances with a molecular diameter smaller than the diameter of the cavities in the molecular sieve crystals can enter the molecular sieve crystals and thus be adsorbed; otherwise, they will be repelled.

Molecular sieves determine the order of preferential adsorption according to the polarity of molecules of different substances. They have a selective adsorption effect based on the size and shape of molecules, that is, they only adsorb those molecules smaller than the pore diameter of the molecular sieve. For small polar molecules and unsaturated molecules, they have selective adsorption performance. The greater the polarity and the higher the degree of unsaturation, the stronger the selective adsorption.

Type A molecular sieve is one of the types of molecular sieves. Its structure is very similar to that of NaCl and belongs to the cubic crystal system. Since the effective pore diameter of molecular sieve 4A is 0.4