4A molecular sieve activated powder is a type of sodium aluminosilicate with a crystalline structure, characterized by its ability to selectively adsorb molecules with a critical diameter of up to 4 angstroms (Å). Its chemical formula is generally represented as Na₁₂(AlO₂)₁₂(SiO₂)₁₂·xH₂O, and it appears as a white to light brown powder with high hygroscopicity.
Key Properties
Physical and Chemical Characteristics
- Water Solubility: Insoluble in cold water, hot water, methanol, diethyl ether, n-octanol, and acetone.
- Stability: Chemically stable under normal conditions but incompatible with strong acids and bases.
- Hygroscopicity: Highly hygroscopic, forming reversible hydrates, which makes it suitable for dehydration applications.
Particle Size
A common specification for 4A molecular sieve activated powder is 50 microns, though other particle sizes may be available based on specific application requirements.
Primary Applications
- Static Dehydration: Used for drying gases or liquids in closed systems, such as household refrigeration systems, pharmaceutical packaging, motor vehicle air conditioners, and electrical components.
- Industrial Adsorption: Employed in processes requiring selective removal of moisture or small molecules, leveraging its precise pore size and high adsorption capacity.
Storage and Handling
- Storage Conditions: Store in a cool, dry, and well-ventilated area to prevent moisture absorption.
- Precautions: Avoid contact with strong acids and bases. Due to its hygroscopic nature, sealed containers are recommended to maintain activity.
Availability
4A molecular sieve activated powder is commercially available in various packaging sizes, including 100g, 500g, 1kg, 5kg, and 25kg. Suppliers typically offer reagent-grade products suitable for industrial and laboratory use.
For detailed purchasing information, refer to chemical suppliers or product listings such as L05466 (3-5mm beads) priced at 404 yuan for 250g, though specifications may vary by particle size and grade.
