Application of carbon molecular sieve in PSA N2 generator
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Application of carbon molecular sieve in PSA N2 generator

Views: 0     Author: Site Editor     Publish Time: 2023-12-21      Origin: Site

When making N2, it is important to know the purity level you want to achieve.

Some applications require low purity levels (between 90 and 99%), such as tire inflation and fire provention, while other applications, such as those in the food and beverage industry or plastic molding, require high levels (from 97 to 99.999%).

In these cases, the PSA technique is the most ideal and simplest method.

Essentially, a nitrogen generator works by separating nitrogen molecules from oxygen molecules in compressed air.

Pressure swing adsorption (PSA) works by absorbing O2 adsorbed in a stream of compressed air.

Oxygen molecules are adsorbed to carbon molecular sieves (CMS).

This occurs in two separate pressure vessels, each filled with CHEMXIN carbon molecular sieves, switching between the separation process and the regeneration process.

Let's call them Tower A and Tower B.

First, clean and dry compressed air enters Tower A. Because oxygen molecules are smaller than nitrogen molecules, they will enter the pores of CHEMXIN carbon molecular sieve.

Nitrogen molecules, on the other hand, cannot enter the pores, so they bypass CHEMXIN carbon molecular sieve.

As a result, you end up with nitrogen of the desired purity.

This stage is called the adsorption or separation.


However, it doesn't stop there.  Most of the N2 produced in tower A leaves the system (prepared for direct use or storage), while a small portion of the N2 flies into tower B in the opposite direction (top to bottom).

This flow squeezes the oxygen captured in the pre-adsorption stage of tower B. By releasing the pressure in tower B, Chemxin carbon molecular sieve loses its ability to hold oxygen molecules.

They will be separated from CMS and carried away from the waste gas through a small stream of N2 from tower A.

By doing this, the system provides space for new oxygen molecules to adsorb to the CMS during the next adsorption stage.


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