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     Molecular sieves are synthetic alkali metal aluminosilicates with various cations. They are primarily used for the separation of fixed gases and drying of liquid or gas streams. Molecules are adsorbed primarily because their molecular diameter matches the pore diameter of the molecular sieve. They can be reactivated by heating at 250oC for 12 hours; 300oC for 4 hours; or 350oC for 2 hours.
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