There are three main oxygen production methods in the industry, namely, low-temperature distillation separation method (cryogenic), adsorption method and electrolysis method. Their gas separation principles are different. Low temperature distillation separation method is to liquefy air at low temperature, and then separate oxygen and nitrogen into oxygen and nitrogen by using different boiling points of oxygen and nitrogen. The principle of electrolysis is to put direct current into water and separate oxygen and hydrogen through electrolysis.

Pressure swing adsorption method was introduced in the late 1950s. It uses zeolite molecular sieve as adsorbent and uses the principle of pressurized adsorption and depressurization desorption to adsorb and release nitrogen from the air, so as to separate oxygen. After decades of continuous development, this technology has been very mature and has the following characteristics.

1. Oxygen can be separated from the air source at room temperature.

2. The cost of gas separation is low, mainly due to power consumption, and the power consumption per unit of oxygen production is low.

3. Molecular sieve can be reused, and its service life is usually 8-10 years.

4. Production raw materials come from air, environmental protection and high efficiency, and raw materials have no cost.

5. It can produce high oxygen purity to meet various oxygen needs.

6. Oxygen can be produced and taken at any time. The equipment can be started and stopped conveniently and produce gas quickly.

7. The equipment has the advantages of simple composition, simple operation, high degree of automation and unmanned operation.

8. The construction cost of equipment system is relatively low. Low maintenance cost.

Because PSA molecular sieve PSA oxygen production technology has these advantages, it has high cost performance in the application field of small and medium-sized oxygen production. It is also favored by more and more oxygen consuming enterprises at home and abroad. It is an ideal choice for small and medium-sized oxygen producing and oxygen consuming enterprises.