What does N2 purity depend on?

Nitrogen is mainly produced by Chemxin carbon molecular sieve and nitrogen generator.

The purity of N2 directly affects the application effect of nitrogen in various fields, such as chemical industry, medicine and food, etc.

There are 5 key parameters affecting the purity of N2.

1. Raw air

The quality of raw air is the primary factor affecting N2 purity. Impurities such as moisture, oil, and dust in the air will clog the pores of the carbon molecular sieve (CMS), reduce its adsorption capacity, and thus affect the purity of the gas produced.

2. Carbon molecular sieve performance

Different types of CMS have different adsorption capacities for nitrogen and oxygen, so choosing a suitable CMS is crucial to improving N2 purity. In addition, the physical properties of CMS, such as particle size, specific surface area, and pore volume, will also affect its adsorption performance. Generally speaking, CMS with small particle size, large specific surface area, and large pore volume have better adsorption capacity.

3. Operating pressure

At higher operating pressures, the adsorption capacity of the molecular sieve is enhanced, which is conducive to improving the purity of N2. However, too high an operating pressure will also increase energy consumption and equipment costs. 

4. Operating temperature

Generally speaking, CMS has a stronger adsorption capacity at a lower temperature. However, too low a temperature may cause CMS to freeze or frost, affecting its adsorption performance.

5.Operating flow

When flow rate is too large, the residence time of the raw air in the CMS is shortened, resulting in insufficient adsorption and affecting the purity of N2. On the contrary, if rate is too small, the utilization rate of the CMS will be reduced, and energy consumption and costs will be increased.