What are the determining factors for the nitrogen production efficiency of carbon molecular sieves?

I. Microporous Structure and Surface Properties

1. Pore Size Distribution: The pore size distribution of carbon molecular sieves needs to match the size of gas molecules such as nitrogen and oxygen. Its average pore size is generally between 0.3-1.0 nanometers. Ideally, it allows oxygen molecules to enter the micropores while blocking ammonia molecules, achieving nitrogen-oxygen separation through this sieving effect, thus obtaining high-purity nitrogen.

2. Specific Surface Area: The larger the specific surface area, the stronger the adsorption capacity of the carbon molecular sieve, enabling it to adsorb more oxygen molecules and thus improve the nitrogen production efficiency. A high specific surface area provides more active sites for gas adsorption, allowing the carbon molecular sieve to process more air and produce more nitrogen per unit time.

II. Filling Amount and Uniformity

1. Filling Amount: In nitrogen generation equipment, the filling amount of carbon molecular sieve directly affects the nitrogen production efficiency. Insufficient packing volume will prevent the proper processing of the raw air, making it difficult to obtain high-purity and sufficient nitrogen yield; while excessive packing volume may lead to increased equipment costs and excessive bed resistance.

2. Packing Uniformity: The uniformity of the carbon molecular sieve packing within the adsorption tower is also crucial. Uneven packing will result in uneven gas distribution within the tower, leading to localized over- or under-adsorption, affecting the overall adsorption and separation efficiency, and reducing nitrogen purity and yield.