Zeolite 4A Molecular Sieve Desiccant For Petroleum Additives
| Molecular Sieve type 4A is an alkali alumino silicate; it is the sodium form of the Type A crystal structure. 4A molecular sieve has an effective pore opening of about 4 angstroms (0.4nm). 4A Molecular sieve will adsorb most molecules with a kinetic diameter of less than 4 angstroms and exclude those larger. Such adsorbable molecules include simple gas molecules such as oxygen, nitrogen, carbon dioxide and straight chain hydrocarbons. Branched chain hydrocarbons and aromatics are excluded |
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The Technical Parameter Of 4A Molecular Sieve
| Shape |
Sphere |
Pellet |
| Diameter (mm) |
1.7-2.5 |
3.0-5.0 |
1.6 |
3.2 |
| Size ratio up to grade (%) |
≥98 |
≥98 |
≥96 |
≥96 |
| Bulk density (g/ml) |
≥0.72 |
≥0.70 |
≥0.66 |
≥0.66 |
| Wear ratio (%) |
≤0.20 |
≤0.20 |
≤0.20 |
≤0.20 |
| Crushing strength (N) |
≥35/piece |
≥85/piece |
≥35/piece |
≥70/piece |
| Static H2O adsorption (%) |
≥22 |
≥22 |
≥22 |
≥22 |
| Static methanol adsorption(%) |
≥15 |
≥15 |
≥15 |
≥15 |
| Water content (%) |
≤1.0 |
≤1.0 |
≤1.0 |
≤1.0 |
Typical Chemical Formula: Na2O . Al2O3 . 2SiO2 . 4.5H2O
SiO2 : Al2O3 ≈ 2
4A Molecular Sieves Application
» Drying of pyrolysis gases in Ethylene manufacturing
» Concentrating of alcoholic solutions
» Drying of organic liquids (Kerosene, Hexane, Benzene, Cyclohexane, Methanol, Ethanol, Isopropanol and so on)
» Drying and removing of CO2 from natural gas, LPG, air, inert and atmospheric gases, etc
» Removal of hydrocarbons, ammonia and methanol from gas streams (ammonia syn gas treating)
» Special types are used in the air break units of buses, trucks and locomotives
» Packed in small bags, it may be used simply as a packaging desiccant
Molecular Seive
