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Product CenterEngaged in the research, development, and production of molecular sieves; in May 1994, a binder-free 5A hydrogen‑producing molecular sieve production line was commissioned and put into operation; in 2005, it passed environmental protection acceptance by the Henan Provincial Environmental Protection Department; in 2006, it obtained ISO 9001:2000 quality management system certification...
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4A molecular sieve
The pore size of 4A molecular sieve is 4 Å; it adsorbs water, methanol, ethanol, hydrogen sulfide, sulfur dioxide, carbon dioxide, ethylene, and propylene, but does not adsorb any molecules with a diameter greater than 4 Å (including propane). Its selective adsorption for water is superior to that for any other molecule. It is one of the most widely used types of molecular sieves in industry.
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Keywords: Zeolite molecular sieve
Product Description
4A molecular sieve is an alkali metal aluminosilicate that can adsorb water, NH 3 , H 2 S, sulfur dioxide, carbon dioxide, C 2 H 5 OH, C 2 H 6 , C 2 H 4 Molecules with a critical diameter no greater than 4 Å. They are widely used for the drying of gases and liquids and can also be employed for the refining and purification of certain gases or liquids, such as the production of argon.
Reference parameters
Chemical formula: Na 2 O·Al 2 O 3 ·2SiO 2 ·9/2H 2 O
Silica-to-alumina ratio: SiO 2 / To 2 O 3 ≈2
Effective pore size: approximately 4 Å
Molecular sieves are a class of crystalline aluminosilicates.
Molecular formula: Na2O·Al2O3·2.0SiO2·4.5H2O
■ Selective adsorption based on molecular size and shape, whereby only molecules smaller than the molecular sieve’s pore diameter are adsorbed.
■ For small polar molecules and unsaturated molecules, the material exhibits selective adsorption; the greater the polarity and the higher the degree of unsaturation, the stronger the selectivity.
■ It exhibits strong water‑absorption capacity. Even under elevated temperatures, high gas velocities, and low moisture levels, it maintains a remarkably high water‑adsorption capacity. It can be used to produce molecular sieves in the 3A, 4A, 5A (oxygen production), 5A (desulfurization), 10X, 13X, and CU‑13X series, available in both pelletized and granular forms. These materials are characterized by high mechanical strength, excellent thermal stability, and superior selective adsorption performance. They find extensive applications in the chemical, petrochemical, and natural gas industries.
Molecular sieve
It exhibits high adsorption capacity, strong selectivity, and excellent thermal stability. It is widely used in organic and petrochemical industries and serves as an outstanding adsorbent for gas dehydration.
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Related products
A synthetic hydrated aluminosilicate (zeolite) or a natural zeolite that functions as a molecular sieve. Its general chemical formula is (M′2M)O·Al2O3·xSiO2·yH2O, where M′ and M represent monovalent and divalent cations, such as K+, Na+, Ca2+, and Ba2+. Structurally, it features numerous uniform‑sized channels and well‑ordered cavities; molecular sieves with different pore sizes can separate molecules of varying sizes and shapes. Depending on the SiO2/Al2O3 molar ratio, molecular sieves with distinct pore dimensions are obtained. Common types include: 3A (potassium A‑type), 4A (sodium A‑type), 5A (calcium A‑type), 10Z (calcium Z‑type), 13Z (sodium Z‑type), Y (sodium Y‑type), and sodium mordenite, among others. These materials exhibit high adsorption capacity, strong selectivity, and excellent thermal stability. They are widely used in organic and petrochemical industries and serve as outstanding desiccants for gas dehydration. Moreover, they are increasingly recognized for their utility in exhaust‑gas purification.
The pore size of 4A molecular sieve is 4 Å; it adsorbs water, methanol, ethanol, hydrogen sulfide, sulfur dioxide, carbon dioxide, ethylene, and propylene, but does not adsorb any molecules with a diameter greater than 4 Å (including propane). Its selective adsorption for water is superior to that for any other molecule. It is one of the most widely used types of molecular sieves in industry.
5A molecular sieve can adsorb any molecule smaller than its pore size and is commonly referred to as a calcium‑type molecular sieve. In addition to the functions of 3A and 4A molecular sieves, it can also adsorb n‑paraffins with carbon numbers C3–C4, ethyl chloride, ethyl bromide, butanol, and other compounds, making it suitable for the separation of normal and isomeric hydrocarbons, pressure swing adsorption, and the co‑adsorption of water and carbon dioxide.
A synthetic hydrated aluminosilicate (zeolite) or a natural zeolite that functions as a molecular sieve. Its general chemical formula is (M′2M)O·Al2O3·xSiO2·yH2O, where M′ and M represent monovalent and divalent cations, such as K+, Na+, Ca2+, and Ba2+. Structurally, it features numerous uniform‑sized channels and well‑ordered cavities; molecular sieves with different pore sizes can separate molecules of varying sizes and shapes. Depending on the SiO2/Al2O3 molar ratio, molecular sieves with distinct pore dimensions are obtained. Common types include: 3A (potassium A‑type), 4A (sodium A‑type), 5A (calcium A‑type), 10Z (calcium Z‑type), 13Z (sodium Z‑type), Y (sodium Y‑type), and sodium mordenite, among others. These materials exhibit high adsorption capacity, strong selectivity, and excellent thermal stability. They are widely used in organic and petrochemical industries and serve as outstanding desiccants for gas dehydration. Moreover, they are increasingly recognized for their utility in exhaust‑gas purification.
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