Uses of Nitrogen Generators
Residual oxygen within a package promotes bacterial growth and oxidation, which may compromise quality . Using nitrogen minimises the amount of oxygen present, therefore preserving quality and improving shelf life. this is often particularly relevant to coffee processing, meat packaging, dried foods processing and lettuce packaging.
Using nitrogen to inert the atmosphere during soldering processes has become a generally accepted practice within the electronic assembly industry. no matter whether the soldering process is wave, selective or reflow, nitrogen improves the method by enhancing the joint quality and minimising defects
In laser cutting the beam melts the fabric and high-pressure nitrogen forces the metal quickly to harden. As nitrogen features a shielding effect, the cutting area is protected against 'bluing' and oxidation.
Most pharmaceutical companies have multiple nitrogen demands. The purity requirement varies from 99.5% to 99.9995%. Most pharmaceutical applications are blanketing, inerting and sparging.
Using a nitrogen blanket during beverage storage, pre and post bottling, prevents the expansion of bacteria and other microbes. Another use is purging air from pipes and hoses before bottling and to make sure oxygen isn't introduced during transport. It also can help to preserve freshness.
Nitrogen is used for injection mounding to improve the quality and the strength of moulded plastic product. Liquid plastic is injected into the mould, and as the molten material (polymers) starts to solidify, high-pressure gaseous nitrogen is introduced to push the plastic into every part of the mould, pressing it outwards from the inside.
Nitrogen is the ideal inert gas for blanketing or purging. It can be used to blanket storage tanks where various hydrocarbons or chemicals are housed, or used to reduce the oxygen content to a safe level.
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Types of N2 Generators
PSA Nitrogen Generators
Another way of generating nitrogen is through Pressure Swing Adsorption (PSA). PSA technology is the ideal and easiest method if you have an industry that requires high purity levels. Pressure Swing Adsorption separates nitrogen molecules from the oxygen molecules by trapping oxygen from the compressed air stream using adsorption. Adsorption takes place when molecules bind themselves to an adsorbent, in this case the oxygen molecules attach to a carbon molecular sieve.
Membrane Nitrogen Generator
A membrane nitrogen generator extracts the N₂ in the air supplied by a compressor so that it can be used for professional applications. The compressed air is pushed through a membrane filled with hollow fibers. Oxygen and water vapor dissipate through the fiber walls and are vented out. This leaves only the very dry nitrogen inside the fibers, pushed out on the other end of the membrane, ready for you to use.