Air Separation Unit (ASU)
ASU plants are used in a variety of applications throughout many industries as they produce high-purity gases including oxygen, nitrogen, argon, and other rare gases through five key stages: Filtration, Compression, Purification, Cooling, and Distillation.
Air Filtration
First, atmospheric air passes through a filter which removes any dust and debris.
Air Compression
Next, the air is compressed until around 6 bar.
Purification
Once compressed, the air is purified from water (H₂O) and carbon dioxide (CO₂) molecules to avoid the formation of ice or dry ice during the cooling.
Cooling
Air is then cooled to -173°C. This is close to its liquefaction point.
Distillation
Finally. the cooled air enters the first distillation column where the dinitrogen is extracted for production. Once extracted at -177°C, the dinitrogen is transferred to the second column to cool it. The excess of the dinitrogen is released at -193°C and the dioxygen is extracted for production.
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