Nitrogen generators are mainly used in the fields of pharmaceutical production, storage, packaging, and packaging. Normally, water needles and large infusions that are easy to oxidize need to be protected by nitrogen flushing, otherwise the drug solution is easily oxidized during the storage period, that is, deteriorated. Generally, before encapsulation, the method of flushing with nitrogen before flushing with nitrogen is used to reduce the oxygen concentration in the ampoule or infusion bottle to less than 0.5%, and the liquid medicine can be kept for a long time. Other API manufacturers, such as traditional Chinese medicines, also need nitrogen storage and preservation. Compared with cylinder nitrogen (or liquid nitrogen), the HTN pressure swing adsorption nitrogen generator developed and manufactured by Hunter Gas has low operating cost, stable nitrogen purity and simple operation. It is the best solution for on-site nitrogen use in the pharmaceutical industry.