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ProductsEngaged 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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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.
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