The sodium form of the Type X crystal has a much larger pore opening than the Type A crystals. It also has the highest theoretical capacity of the common adsorbents and very good mass transfer rates. It can remove impurities too large to fit into a Type A crystal and is commonly used to separate nitrogen from oxygen.

Molecular Sieve 13X is used commercially for general gas drying, air plant feed purification (simultaneous removal of H20 and CO2) and liquid hydrocarbon and natural gas sweetening (H2S and mercapstan removal). All molecules which can be adsorbed on molecular sieves 3A, 4A and 5A can be adsorbed on Type 13X. In addition, Type 13X can adsorb molecules of larger critical diameters, such as aromatics and branched-chain hydrocarbons.

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