Description
Specifications Table
Product Name – Molecular sieve, activated, type 4A BAKER ANALYZED™ reagent
Quantity/Pack Size – 500 g
Form – Beads
Grade – Reagent
Application – Moisture adsorption, gas drying, solvent purification
Product Overview
The activated type 4A molecular sieve is a highly porous crystalline aluminosilicate designed for precise moisture control and gas purification in laboratory settings. With a uniform 4Å pore diameter, it selectively adsorbs water, ammonia, methanol, and other small polar molecules while excluding larger compounds, making it ideal for drying solvents, gases, and air streams. This BAKER ANALYZED™ reagent-grade sieve undergoes rigorous quality testing to ensure consistent performance, low dust formation, and minimal impurities. Its high adsorption capacity and thermal stability allow for repeated regeneration cycles without significant degradation, providing long-term cost efficiency. The spherical bead form maximizes surface area contact while minimizing pressure drop in packed beds. Compatible with most organic solvents and non-corrosive gases, it serves as a reliable desiccant in chromatography, synthesis reactions, and storage systems where moisture-sensitive materials are handled. The sieve maintains structural integrity even under high humidity conditions, delivering reproducible results in critical applications.
FAQs
1. What is the difference between 3A, 4A, and 5A molecular sieves?
Type 4A molecular sieves have a 4Å pore size that adsorbs water, ammonia, and methanol but excludes larger molecules like ethanol. 3A sieves (3Å) are smaller and used for drying unsaturated hydrocarbons, while 5A sieves (5Å) can adsorb larger molecules like normal paraffins.
2. Can this sieve be regenerated, and what is the recommended procedure?
Yes, the sieve can be regenerated by heating at 250-300°C for 3-4 hours under dry air or nitrogen flow. Cool in a desiccator before reuse to prevent moisture reabsorption.
3. Is this molecular sieve compatible with acidic or basic solvents?
The sieve is stable in neutral and weakly acidic/basic conditions but may degrade in strong acids (pH 11). For corrosive solvents, consider silica gel alternatives.
4. What is the typical moisture adsorption capacity?
Under standard conditions, type 4A sieves can adsorb up to 22% of their weight in water, depending on humidity and temperature.
5. How should unused molecular sieve be stored to maintain effectiveness?
Store in an airtight container with a desiccant cap or under inert gas to prevent premature moisture adsorption. Keep away from direct sunlight and humidity.
