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4A molecular sieve is a kind of potassium-sodium aluminosilicate with LTA-type skeleton structure which is composed of silicon-oxygen and aluminum-oxygen tetrahedrons.The main crystal hole of the 4A molecular sieve is an eight-membered ring structure, and the crystal pore size is 4Å (0.4nm).It can adsorb water, methanol, ethanol, hydrogen sulfide, sulfur dioxide, carbon dioxide, ethylene and propylene, but does not adsorb any molecule with diameter greater than 4A (including propane). Its selective adsorption performance for water is higher than that of any other molecule.It is one of the largest molecular sieves varieties in industry.It is widely used in the drying of gases and liquids, and also in the refining and purification of some gases or liquids, such as the preparation of argon.
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