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How does air separation unit function?

Air separation unit (ASU) is an industrial system for producing industrial gases with high purity for industrial and medical applications.  Most commonly used industrial gases include oxygen and nitrogen. To begin with oxygen, it is said to constitute 21% of earth’s atmosphere by mass and nitrogen around 79%. However, oxygen and nitrogen used in the industrial application have higher purity, obtained through industrial processes such cryogenic distillation technique, pressure swing adsorption (PSA). Nitrogen is called as the largest industrial gas followed by oxygen. These two gases sustain most of the industrial processes used in wide array of manufacturing activities.

Oxygen and nitrogen are produced by liquefaction of atmospheric air in the air separation unit. It is very important that ASUs are manufactured and fabricated with high quality materials and components. In order to build solid machinery, one cannot over-emphasize the quality of materials used. And, we have experienced engineers and technicians with decades of expertise in constructing industrial gases plants. Moreover, we have also entered into a technical collaboration with an acclaimed Italian technology, “Felice Mandressi of ITALY”. We use world-class Mandressi designs in the fabricating ensuring oxygen nitrogen plants are reliable, durable and high performing.

Atmospheric air is let into the air separation unit after which it is first compressed. Then, the air is sent into the cleanup system where impurities like carbon dioxide, moisture and hydrocarbons are removed. Henceforth, the air is moved through the heat exchangers where it is liquefied to extremely low temperatures. Now, the process air gets into high pressure distillation column physically separation oxygen and nitrogen from other gases.  Oxygen is formed at the top of the column and nitrogen at the bottom.  Here, oxygen and nitrogen are collected and moved into the low pressure distillation column where the industrial gases distilled further to meet commercial specifications.

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