The amount of nitrogen and oxygen adsorbed by carbon molecular sieve in a pressure swing adsorption nitrogen machine

PSA nitrogen production (PSA nitrogen production for short) is a leading gas separation technology, using high quality imported carbon molecular sieve (CMS) as adsorbent, using pressure swing adsorption (PSA) principle at room temperature to separate air to produce high purity nitrogen. Oxygen and nitrogen gas molecules have different dispersion rates on the surface of the molecular sieve. Gas molecules with smaller diameter (O2) have a faster dispersion rate and more enter the micropores of the carbon molecular sieve, while gas molecules with larger diameter (N2) have a slower dispersion rate and fewer enter the micropores of the carbon molecular sieve. This selective adsorption difference between nitrogen and oxygen using carbon molecular sieve results in oxygen enrichment in the adsorption phase and nitrogen enrichment in the gas phase in a short time, so that oxygen and nitrogen are separated and gas phase enrichment nitrogen is obtained under PSA conditions.

The difference curve of adsorption capacity change of carbon molecular sieve for oxygen and nitrogen at a certain time under different pressures:

After a period of time, the adsorption of oxygen by the molecular sieve reaches equilibrium. According to the characteristics of the adsorption amount of adsorbed gas by the carbon molecular sieve under different pressures, the decreasing pressure makes the carbon molecular sieve exempt from the adsorption of oxygen, and this process is regeneration. According to the regeneration pressure is not the same, can be divided into vacuum regeneration and atmospheric regeneration. Atmospheric regeneration is conducive to complete regeneration of molecular sieve and easy to obtain high purity gas.

Pressure swing adsorption nitrogen machine (PSA nitrogen machine for short) is a nitrogen injection equipment designed and manufactured according to pressure swing adsorption technology. Generally, two adsorption towers are used in parallel, and the timing is strictly controlled by the automatic control system according to a specific programmable program, and the pressure adsorption and decompression regeneration are replaced to complete the separation of nitrogen and oxygen, and the required high purity nitrogen is obtained.

The dynamic adsorption capacity of carbon molecular sieve (CMS) and the function of separation coefficient determine the quality of nitrogen making machine.