How to efficiently and stably obtain high-purity nitrogen from air

A nitrogen generator is a complete set of equipment that uses clean compressed air as raw material and extracts high-purity nitrogen directly from air via physical separation technologies. 

It represents the most economical, efficient and stable on-site nitrogen production method in modern industry, widely adopted in nearly all manufacturing sectors including electronics, 

chemical industry, food processing, pharmaceuticals and metallurgy.

How does a nitrogen generator "filter out" high-purity nitrogen from air?
Main components of air: 78% nitrogen, 21% oxygen, water, dust and a small amount of other gases.
Nitrogen generators rely purely on physical separation without chemical reactions. Three mainstream technologies are available:
PSA (Pressure Swing Adsorption) Nitrogen Generation

Centered on carbon molecular sieves (CMS). Under pressurization, the molecular sieve preferentially adsorbs oxygen, water and carbon dioxide. Since nitrogen is barely adsorbed, 

it flows out directly as product gas. When pressure is released, the molecular sieve undergoes desorption and regeneration to enable cyclic operation.

Membrane Separation Nitrogen Generation
It adopts hollow fiber membranes featuring different permeation rates for oxygen and nitrogen. Oxygen penetrates the membrane rapidly while nitrogen is enriched.
Cryogenic Air Separation Nitrogen Generation
Air is liquefied, and nitrogen is separated from oxygen through rectification based on their boiling point differences.
Key Factors for Efficient, Stable and High-Purity Nitrogen Production
1. Clean Front-End Air Source
The air flows through the process: Air compressor → Air receiver → Filter → Air dryer → Nitrogen generator.
Water removal: Refrigerated air dryer / Desiccant air dryer
Oil removal: Three-stage precision filters + activated carbon oil removal unit
Dust removal: High-precision filters
Oil and moisture will permanently poison molecular sieves and cause irreversible purity degradation.
2. Stable Operating Pressure
The optimal working pressure ranges from 0.7~1.0 MPa. An air receiver and pressure regulator must be equipped to prevent purity fluctuations caused by unstable pressure.
3. On-line Monitoring & Automatic Control

The system automatically adjusts adsorption/regeneration cycles according to nitrogen purity, pressure and gas consumption. 

It automatically vents substandard nitrogen and triggers alarms for abnormal pressure or equipment faults, preventing unqualified nitrogen from entering the gas supply system.

Equipped with fully automatic PLC control, twin towers operate alternately to deliver continuous and stable gas supply 24 hours a day.
Core Application Scenarios of Nitrogen Generators
1. Electronics, Semiconductors & Lithium Batteries
Applications: Chip manufacturing, SMT soldering, lithium battery electrolyte filling & sealing, printed circuit board production
Functions: Inert shielding to avoid oxidation and short circuits, and improve product yield.
2. Food Industry
Applications: Nitrogen-flushed packaging for potato chips, nuts, milk powder and meat; modified atmosphere storage for grains
Functions: Isolate oxygen, inhibit bacteria, resist oxidation, extend shelf life and meet food-grade standards.
3. Pharmaceutical Industry
Applications: Nitrogen filling for injections, active pharmaceutical ingredient synthesis, aseptic packaging, low-temperature sample preservation
Functions: Prevent oxidative deterioration of medicines and satisfy GMP cleanliness requirements.
4. Chemical Industry
Applications: Tank inerting, pipeline purging, protection of flammable materials, nitrogen injection for oil & gas fields
Functions: Prevent explosion, fire and oxidation, greatly enhancing production safety.
5. Metal Processing
Applications: Bright annealing, quenching, sintering, laser cutting, stainless steel welding
Functions: High-temperature shielding gas to avoid metal oxidation, discoloration and decarburization.