The principle of carbon molecular sieve separating oxygen and nitrogen

Carbon molecular sieve pressure swing adsorption nitrogen production is based on van der Waals force to separate oxygen and nitrogen. The dynamic diameter of oxygen molecule is 0.346nm, and the dynamic diameter of nitrogen molecule is 0.364nm. Between the molecular and nitrogen molecular diameters, it is most conducive to the separation of oxygen and nitrogen, with the highest separation efficiency.

In fact, the pores of the carbon molecular sieve are scattered between 0.32 and 0.38 nm. When carbon molecular sieve adsorbs gas, the macropores and mesopores only act as channels, and the adsorbed molecules are transported to the micropores and submicropores. The micropores and submicropores (<0.38nm ) These micropores allow gas molecules with small kinetic dimensions to diffuse quickly into the pores while restricting the entry of large diameter molecules. Due to differences in the relative diffusion rates of gas molecules of different sizes, the components of the gas mixture can be effectively separated.

The pore size of the micropores is the basis for the separation of oxygen and nitrogen by the carbon molecular sieve. If the pore size is too large, the oxygen and nitrogen molecules can easily enter the micropores and cannot play the role of separation; while the pore size is too small, the oxygen and nitrogen molecules cannot enter In the micropores, there is no separation effect.

The carbon molecular sieve produced by our company uses the self-invented micropore adjustment control process. During the processing of the carbon molecular sieve, the micropores are precisely adjusted, and then the nitrogen production process independently developed by our company is matched to maximize the use of the carbon molecular sieve. Performance, under the same adsorption pressure, it can produce more nitrogen and consume less air.