How to get food grade nitrogen?
There are two ways of getting food grade nitrogen. One is to purchase it from a vendor. However, that is expensive and has several other disadvantages: It poses logistical challenges and could result in supply bottlenecks. In addition, the heavy, pressurized nitrogen containers are an occupational safety hazard.
The second method is to generate nitrogen on site. This is much less expensive, ensures a steady supply and lets you choose the required nitrogen purity.
For on-site nitrogen generation, you need a generator and a compressor. The latter compresses ambient air and sends it to the generator, which separates the nitrogen from all other gases – especially oxygen. Since air always contains contaminants, it is essential to filter them out early in this process. Otherwise, they will reduce the quality and purity of the nitrogen and come into contact with the food items.
This means that an effective air treatment is the key to keeping the nitrogen pure. In fact, several organizations have identified the compressed air used in processing and packaging a possible threat to food air safety. These include the International Organization for Standardization (ISO), the Safe Quality Food Institute and the British Retail Consortium.