Introduction of PSA Oxygen Generation

Updated: Aug 5, 2021

1. What is PSA technology?


Pressure Swing Adsorption (PSA) is an effective new gas separation technology. Like cryogenic air separation, PSA technology has become an independent chemical operation unit for modern industrial gas separation and purification, and is widely used in air separation, gas drying and hydrogen separation and refining, etc.

Among them, the PSA oxygen production started in the early 1960s and realized industrial production in 1970. For decades, with the maturity of PSA oxygen generation technology, in the case of non-high purity oxygen (purity less than 95%), this technology has a small area, low investment, short startup time, simple operation. The characteristics of low energy consumption, easy maintenance and large load operation adjustment range have become the main method of obtaining low-cost oxygen in the world, and have been widely used in many fields such as oxygen-enriched combustion, metal smelting, medical care, wastewater treatment, pulp bleaching, etc. .


2. What is PSA oxygen generation?


PSA oxygen generation technology uses physical adsorption to separate air to produce oxygen. At present, the most used adsorbent is zeolite molecular sieve, which is a polar adsorbent. The nitrogen is much easier than oxygen to be adsorbed by zeolite. Under isothermal conditions, when pressurized air passes through the zeolite molecular sieve in the adsorption tower, the equilibrium adsorption capacity of nitrogen increases more than that of oxygen. When the pressure decreases, the equilibrium adsorption capacity of nitrogen decreases much more than that of oxygen. Using this feature of oxygen molecular sieve, the use of 2 or more adsorption towers for pressure adsorption and decompression desorption cycle operation process can continuously produce oxygen.

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