3Å molecular sieve do not adsorb molecules whose diameters are larger than 3 Å. The characteristics of these molecular sieves include fast adsorption speed, frequent regeneration ability, good crushing resistance and pollution resistance. These features can improve both the efficiency and lifetime of the sieve. 3Å molecular sieves are the necessary desiccant in petroleum and chemical industries for refining oil, polymerization, and chemical gas-liquid depth drying.
3Å molecular sieves are used to dry a range of materials, such as ethanol, air, refrigerants, natural gas and unsaturated hydrocarbons. The latter include cracking gas, acetylene, ethylene, propylene and butadiene.
3Å molecular sieve is utilized to remove water from ethanol, which can later be used directly as a bio-fuel or indirectly to produce various products such as chemicals, foods, pharmaceuticals, and more. Since normal distillation cannot remove all the water (an undesirable byproduct from ethanol production) from ethanol process streams due to the formation of an azeotrope at around 95 percent concentration, molecular sieve beads are used to separate ethanol and water on a molecular level by adsorbing the water into the beads and allowing the ethanol to pass freely. Once the beads are full of water, temperature or pressure can be manipulated, allowing the water to be released from the molecular sieve beads.
3Å molecular sieves are stored at room temperature, with a relative humidity not more than 90%. They are sealed under reduced pressure, being kept away from water, acids and alkalis.
Approximate chemical formula: 2/3K2O•1/3Na2O•Al2O3• 2 SiO2 • 9/2 H2O
Silica-alumina ratio: SiO2/ Al2O3≈2
3A Molecular sieve has become one of the most reliable desiccants for a variety of applications including:
Moisture removal in PU Plastic or Paint
Natural Gas Drying
Drying Cracked Gas
Static drying of insulating glass units, whether air filled or gas-filled.
Dehydration of highly polar compounds, such as methanol and ethanol.
Dehydration of unsaturated hydrocarbons (e.g. ethylene, propylene, butadiene).
3A Molecular Sieve regenerated and reused. To regenerate the sieve you need to remove the adsorbed moisture and other materials. To regenerate 3A Molecular Sieve heat to 250ƒ.