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3A molecular sieve, also know as 3A zeolite, is a multiple purpose, highly porous, high-capacity alkali metal aluminosilicate in the spherical form. It is the potassium form of the type A crystal structure, and the chemical formula is K12 [(AlO2)12(SiO2)12] · nH2O. The 3A molecular sieve has a fast adsorption speed. The 3A molecular sieve is equipped with a pore size of 3 angstroms, due to the relatively large potassium ions in the molecular structure. It allows moisture to be adsorbed but excludes unsaturated hydrocarbons and highly polar alcohols such as methanol and ethanol.
Alfa Chemistry 3A molecular sieve is commonly used for the drying of highly polar alcohols such as ethanol and methanol, drying of unsaturated hydrocarbons (ethylene, propylene, butadiene), static dehydration of gas, static dehydration of air-filled insulated glass units, natural gas drying, and cracked gas drying.
| Catalog No. | MS3A-1 | MS3A-2 | MS3A-3 | MS3A-4 |
| Diameter(mm) | 1.7-2.5 | 3.0-5.0 | 1.6 | 3.2 |
| Color | Light gray | Light gray | Light gray | Light gray |
| Shape | Sphere | Sphere | Pellet | Pellet |
| Size ratio up to grade (%) | ≥98 | ≥98 | ≥96 | ≥96 |
| Bulk density (g/ml) | ≥0.7 | ≥0.7 | ≥0.68 | ≥0.68 |
| Wear ratio (%) | ≤0.2 | ≤0.2 | ≤0.4 | ≤0.4 |
| Crushing strength (N) | ≥35/piece | ≥85/piece | ≥30/piece | ≥50/piece |
| Static H2O adsorption (%) | ≥21 | ≥21 | ≥21 | ≥21 |
| Dynamic capacity (%) | ≥20 | ≥20 | ≥20 | ≥20 |
| Ethylene adsorption (‰) | ≤3.0 | ≤3.0 | ≤3.0 | ≤3.0 |
| Water content (%) | ≤1.5 | ≤1.5 | ≤1.5 | ≤1.5 |
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