Generator of pure nitrogen is designed for generation of pure nitrogen in laboratory environment, it is used for chromatograph feeding. Due to high outlet pressure, deep purification and low moisture content produced nitrogen can be used as gas-carrier, including cases when electron capture detector (ECD) is used. Compressed air is used for feeding the generator at pressure 6 atm and consumption no less than 5 l/min from compressor or air line with standard requirements to the quality of air (air for measuring devices).
The principle of the device
Compressed air from the internal source (air compressor, technological line with compressed air) is delivered to generator through coalescence filter, where pre-cleaning from dust and oil drops condensation is done. Extraction of nitrogen in the generator is done by air separation by means of short-cycle no-heat adsorption on carbon molecular sieve by two-arm scheme with two alternately working adsorbers. Simultaneously gas is purified from water vapor, carbon dioxide, oils, hydrogen and carbohydrates except methane. Purifications from helium, neon and argon don’t happen, purification from methane is minor. State standard 9293-74 doesn’t standardize the amount of argon in nitrogen. Real amount of argon in generated nitrogen is about 1%.
All listed not normalized impurities, except methane, hardly affect the possibility of using produced nitrogen as gas-carrier for gas chromatography. Methane contents can be reduced to 0,1 ppm by using catalytic purification filter from organic impurities together with generator.