To generate these gases, we use air separation towers (ASUs) that are 60 meters or more high. Inside them, a physical process takes place to separate the air's components.
That process, also called low temperature rectifier. Basically, they work like this:
- Filter (remove dust) and compress down to about 6 bar
- Pre-cooling
- Dry and remove all CO2
- Cool to below -175 ° C and liquefy in main heat exchanger
- Separate into gaseous or liquid form for oxygen and nitrogen products in the separator column
- Argon is also separated into a liquid
- The gases are stored in liquid form in the tank
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