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4A series

4A series

  • Classification:Product Center
  • Views:second
  • Date of issue:2021-02-05
  • Product overview


The 4A molecular sieve has a pore size of 4A, which absorbs water, methanol, ethanol, hydrogen sulfide, sulfur dioxide, carbon dioxide, ethylene, and propylene. It does not adsorb any molecules (including propane) with a diameter greater than 4A. The selective adsorption performance of water is higher than any other molecules. It is one of the molecular sieve varieties used in industry. Molecular Sieve Wholesale

4A molecular sieve is an alkali metal aluminosilicate, which can adsorb water, NH3, H2S, sulfur dioxide, carbon dioxide, C2H5OH, C2H6, C2H4 and other molecules with a critical diameter not greater than 4A. It is widely used in the drying of gases and liquids, and can also be used in the refining and purification of certain gases or liquids, such as the production of argon.

Molecular sieve is a synthetic aluminosilicate with microporous cubic lattice. According to the size of the pores in the crystal, it can adsorb or repel molecules of different substances, so it is called "molecular sieve". Substances with a molecular diameter smaller than the diameter of the pores of the molecular sieve crystal can enter the molecular sieve crystal and be adsorbed, otherwise, they are repelled.

Molecular sieves determine the order of preferential adsorption according to the polarity of molecules of different substances. The selective adsorption is based on the size and shape of the molecules, that is, only those molecules smaller than the pore size of the molecular sieve are adsorbed. For small polar molecules and unsaturated molecules, it has selective adsorption properties. The greater the polarity, the higher the degree of unsaturation and the stronger the selective adsorption.

A-type molecular sieve is one of the molecular sieves, and its structure is very similar to that of NaCl and belongs to the cubic crystal system. Because the effective pore size of 4A molecular sieve is 0.4nm, it is called 4A molecular sieve. Its spatial network structure is formed by staggered arrangement of silicon-oxygen tetrahedral units [SiO4] and aluminum-oxygen tetrahedral [AlO4] units.


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