NINGBO INNO PHARMCHEM CO.,LTD. offers a comprehensive range of molecular sieves, each tailored for specific industrial requirements. This guide focuses on helping you choose the right molecular sieve, with a particular emphasis on understanding the distinct advantages of the 4A type compared to other common variants like 3A, 5A, and 13X.

The primary differentiator between molecular sieve types is their pore size, which dictates their selectivity for adsorbing molecules. The 4A molecular sieve features a 4 Angstrom pore opening, making it ideal for adsorbing molecules such as water, CO2, and ammonia. It's a workhorse for general-purpose drying and purification where these specific contaminants are of concern.

In contrast, the 3A molecular sieve has a smaller pore size of 3 Angstroms. This makes it particularly effective for dehydrating unsaturated hydrocarbons like ethylene and propylene, and for drying highly polar compounds such as methanol and ethanol. It excludes molecules larger than 3 Angstroms, offering a finer level of separation in specific chemical processes.

The 5A molecular sieve possesses a 5 Angstrom pore opening, enabling it to adsorb larger molecules. It is commonly used for separating normal paraffins from branched-chain hydrocarbons and for pressure swing adsorption (PSA) applications, such as oxygen and hydrogen purification. Its larger pores allow for the adsorption of a broader range of molecules compared to 3A and 4A.

Lastly, the 13X molecular sieve has the largest pore size among these common types, approximately 10 Angstroms. This allows it to adsorb larger molecules, including aromatics and complex hydrocarbons. It is frequently used in air separation units for the simultaneous removal of water and carbon dioxide, and in various gas purification processes.

When considering which molecular sieve to buy, factor in the target molecules for adsorption. If your primary need is general moisture removal from air, natural gas, or refrigerants, the 4A molecular sieve is often the most cost-effective and efficient choice. For more specialized applications involving unsaturated hydrocarbons or specific gas separations, 3A, 5A, or 13X might be more appropriate. NINGBO INNO PHARMCHEM CO.,LTD. can assist you in selecting the optimal molecular sieve desiccant for your unique industrial challenges.