4A molecular sieve, a widely used adsorbent in drying processes, boasts impressive water absorption capabilities. Under standard conditions—25°C and 50% relative humidity—its static water adsorption capacity typically ranges from 21% to 28% by weight. This means 100 grams of 4A molecular sieve can absorb 21 to 28 grams of water, depending on the product form and quality.
The structure of 4A molecular sieve, with uniform 4-angstrom pores, enables it to selectively trap water molecules while excluding larger ones. This specificity enhances its efficiency in moisture removal, even in low-humidity environments. The packing of 4A molecular sieve in industrial systems, such as drying columns, ensures maximum contact with moisture-laden gases or liquids, optimizing absorption.
Temperature and humidity significantly influence its performance. At temperatures below 100°C, the adsorption capacity remains high, but it gradually decreases with higher heat. In low-humidity settings, 4A molecular sieve still outperforms many desiccants, maintaining effective water uptake. This versatility makes it ideal for applications like gas purification, ethanol drying, and compressed air treatment.
Compared to alternatives like silica gel or calcium oxide, 4A molecular sieve offers superior water absorption, often exceeding their capacities by 15 to 20 times. Its regenerability further adds value, as it can be reused after heating to release adsorbed water, ensuring long-term cost efficiency in industrial operations.
