Introduction: a kind of alkali aluminosilicate and able to absorb molecules with their critical diameters no more than 10A . Applications:      a) Dry gas, purify raw air material: get rid of H 2 O and CO 2 .     b) Desulfurate liquid hydrocarbon and natural gas: get rid of H 2 S and thioalcohol.     c) Molecules can be adsorbed by molecular sieve 3A , 4A and 5A can be adsorbed by 13X. d) Can adsorb molecular whose diameter is a little less than critical diameter, such as some aromatic hydrocarbon and branched-chain hydrocarbon. Formula: Na 2 O · Al 2 O 3 · 2.45SIO 2 · 6.0H 2 O Specification: Item unit target Shape   pellet sphere Diameter mm 1.5-1.7 3.0-3.3 1.0-1.6 3.0-5.0 Size % ≥ 98 ≥ 98 ≥ 96 ≥ 96 Bulk density g/ml ≥ 0.54 ≥ 0.54 ≥ 0.60 ≥ 0.60 Wear ratio % ≤ 0.20 ≤ 0.25 ≤ 0.20 ≤ 0.20 Crushing strength N/p ≥ 30 ≥ 45 ≥ 10 ≥ 60 H 2 O adsorption % ≥ 25 ≥ 25 ≥ 25 ≥ 25 CO 2 capacity nl/g ≥ 14 ≥ 14 ≥ 14 ≥ 14 Packing water % ≤ 1.5 ≤ 1.5 ≤ 1.5 ≤ 1.5