Nitrogen fresh-keeping is a modified atmosphere fresh-keeping method that prolongs the storage period of products and maintains the original flavor of products. Among them, the nitrogen used can be produced by the PSA nitrogen generator; this is a device that can continuously produce high-purity, dry nitrogen gas; of course, the nitrogen generator cannot work alone, it needs to work with other supporting equipment together, in order to continuously produce high-purity nitrogen, which includes air compressors, refrigerated dryers or desiccant dryers, filters, etc.

The PSA nitrogen generator separates nitrogen gas based on the principle of pressure swing adsorption. The core component is high-quality carbon molecular sieve adsorbent, which can enrich nitrogen under the action of pressure to produce high-purity product N2.

When we use nitrogen to keep edible oil fresh, we are actually using nitrogen to isolate the oxygen in the air to prevent the oil from being oxidized and rancid.

Specifically, it is to fill the oil tank, filling or bottled edible oil with nitrogen to replace the oxygen that originally existed in the air; a nitrogen protective layer is formed to protect the edible oil from contact with oxygen in the air. Considering that nitrogen is colorless and odorless, it will not affect the original flavor of oil; moreover, it exists in the air in large quantities, which is different from synthetic antioxidants and has the advantages of being natural and safe.