Molecular sieve nitrogen generator uses the principle of molecular sieve pressure swing adsorption (PSA) to separate and produce nitrogen from air. The separation effect of molecular sieve on oxygen and nitrogen in air is mainly based on the different diffusion rates of these two gases on the surface of carbon molecular sieve. Gas molecules with smaller diameters (O2) diffuse faster and more enter the micropores of the molecular sieve. Gas molecules with larger diameters (N2) have slower diffusion rates and less entry into the micropores of the molecular sieve, allowing for the enrichment of nitrogen components in the gas phase.

Therefore, utilizing the characteristic of the difference in adsorption capacity of oxygen and nitrogen by molecular sieves at a certain time, a fully automated control system applies a specific programmable pressure adsorption and atmospheric pressure analysis cycle process to complete nitrogen oxygen separation and obtain the required high-purity nitrogen gas.

The impact of nitrogen generators on chromatography is often overlooked, which is that the operation of the switch power supply inside the generator will cause certain interference with the grid voltage (the start and stop of the compressor will also be affected), so the chromatograph must be powered by a regulated power supply. Of course, there are very few users who do not use a regulated power supply.

It is worth noting that the nitrogen generator can only collect air as a gas source in close proximity to the laboratory or outside the laboratory, and the air inside the laboratory is often contaminated. The organic solvent content in it inevitably exceeds the standard due to pre-treatment processes and other reasons (in addition, the GC needle washing solvent evaporates, and the mobile phase of the liquid phase evaporates).

The nitrogen generator uses air as raw material, carbon molecular sieve as adsorbent, and applies the principle of pressure swing adsorption to selectively adsorb oxygen and nitrogen on carbon molecular sieve to separate nitrogen and oxygen, commonly known as PSA nitrogen production.

Compared with traditional nitrogen production methods, nitrogen generators have the advantages of simple process flow, high degree of automation, fast gas production (15-30 minutes), low energy consumption, adjustable product purity within a large range according to user needs, convenient operation and maintenance, low operating costs, and strong device adaptability.

Therefore, they are highly competitive among nitrogen generators below 1000Nm3/h and are increasingly popular among small and medium-sized nitrogen users. Nitrogen generators have become an ideal choice for small and medium-sized nitrogen users.