What Is Air Separation Plant ?
What is the Industrial Air Separation Plants ?
"An air separation plant separates atmospheric air into its primary components, typically nitrogen and oxygen, and sometimes also argon and other rare inert gases."http://en.wikipedia.org/wiki/Air_separation
never heard of any separation of air.
Answer otter is correct
Answerotter has it right. There are many industrial uses of pure nitrogen, oxygen and argon (the three major components of air). By liquifying air, these three gasses can be separated.