HOW DO MOLECULAR SIEVES REMOVE WATER

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How Do Molecular Sieves Remove Water

Molecular sieves have a large surface area, generally 600-1000 square meters per gram. It has a strong adsorption capacity for polarized and polarizable molecules. Water is a strongly polarized molecule, and its molecular diameter is smaller than that of a molecular sieve which is easily absorbed by a molecular sieve. Molecular sieves are best for water removal as in the high temperature above 230℃, they can still hold water molecules well.

What Is Molecular Sieve?
A molecular sieve is a kind of crystalline aluminosilicate with many regular and uniform pores in the crystal structure, which only allows molecules with a smaller diameter than the pore size to enter, so the molecules in the mixture can be sieved according to their size. There are mainly four different types of zeolites: 3A, 4A, 5A, 13x type. Sieve molecular mainly adsorbs water, gas, graphitic hydrogen gas, alcohols, alkenes, benzene organics, and has extremely high selectivity to water. It is often used for the drying of various liquids and the drying of gases.