During the separation of components of air, which component (gas) is obtained first?

Gaseous nitrogen rises to the top, where it is piped off and stored. Liquid nitrogen has a boiling point equal to −190^oC, and thus, turns into gas first and separated from the air. 

A liquid having the lowest boiling point is distilled first. So, liquid H_2​ will be distilled first, and after this liquid N₂​ will be distilled, followed by liquid O₂​.