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The 4A molecular sieve mainly adsorbs water, methanol, ethanol, hydrogen sulfide, sulfur dioxide, carbon dioxide, ethylene, propylene. It does not adsorb any molecules (including propane) with a diameter greater than 4A. The selective adsorption performance of water is higher than any other molecule. It is one of the most widely used molecular sieve varieties in industry.
Chemical formula: Na2O·Al2O3·2SiO2·9/2H2O
Silicon to aluminum ratio: SiO/Al2O3≈2
Effective aperture: about 4A
Application: Mainly used for drying natural gas and various chemical gases and liquids, refrigerants, pharmaceuticals, electronic materials and variable substances, purification of argon, separation of methane, ethane and propane.
Technical index:
index | unit | Globular | Strip | ||
diameter | mm | 2-3 | 3-5 | 2-3 | 3-5 |
Static water adsorption | ≥%wt | 21.5 | 21.5 | 20.5 | 20.5 |
Adsorption of methanol | ≥mg/g | 150 | 150 | 140 | 140 |
Bulk density | ≥g/cm3 | 0.68 | 0.68 | 0.66 | 0.66 |
Compressive strength | ≥N | 60 | 80 | 40 | 50 |
Wear rate | ≤%wt | 0.1 | 0.1 | 0.2 | 0.2 |
Residual water content | ≤%wt | 1.5 | 1.5 | 1.5 | 1.5 |
regeneration:
1. Dehydration: It depends on the pressure, temperature and water content of the regeneration gas. Under normal circumstances, 200-350 ℃ dry gas under the pressure of 0.3-0.5kg / cm2, through the molecular sieve bed for 3-4 hours, the outlet temperature to 110-180 ℃, cooling.
2. Deorganization: replace organics with steam, then remove moisture.
Storage: Room temperature, relative humidity is not more than 90%; should not be directly exposed to the air; avoid water, acid, alkali.
Packing: 25KG cardboard drum or bag. Specific according to customer requirements.
Note: Do not open the package before use to avoid moisture and affect the adsorption effect.
Manufacturing
