3a Molecular Sieve Desiccant For LNG Purification 2-3mm, 3-5mm, 4-6mm
Molecular sieve (as known as synthetic zeolite) is a micro-porous aluminosilicate crystals. It is made of the silicon-oxy tetrahedron, alumina tetrahedron to form a basic skeleton structure, in which exist metal cations (e.g. Na+, K+, Ca2+, etc.) to balance the excess negative charge in the crystal. According to the type of crystal structure, zeolite consists of: A-type (LTA), X-type (FAU), Y-type and so on.
|Molecular Sieve 3A Typical Physical Properties|
|Item||Unit||8*12 Mesh||4*6 Mesh|
|Bulk Density||g/ml ≥||0.70-0.82||0.65-0.80|
|Equilibrium Water Capacity @ 25℃||wt% ≥||19.0-21.0||19.0-21.0|
|Equilibrium Ethylene Capacity||mg/g≤||3.0||3.0|
|Heat of Adsorption||BTU/lb of H2O||1800||1800|
|Crush Strength||Point Contact||N ≥||20-58||80-130|
|Attrition Rate||wt% ≤||0.1||0.1|
|Size Qualification||% ≥||98||98|
|Package Moisture||wt% ≤||1.5||1.5|
|The interval value of the indexes above are on the basis of the different grade of Molecular Sieve 3A|
The adsorption capacity of molecular sieve comes from the physical adsorption (van der Waals force). The crystal has a strong polarity and Coulomb field, which show a strong adsorption capacity for polar molecules (water) and unsaturated molecules.
The pore size of molecular sieve distribution is very consistent. Only when the molecular diameter is less than the pore size of molecular sieve, the molecule is possible adsorbed into the crystal cave.
Distinguishing molecules of different substances by the priority of adsorption and the sizes, it is vividly called "molecular sieve".
To avoid damp and pre-adsorption of organic before running, or must to be reactivated.