An air
gas separation plant comprising, in the direction of circulation of the air
stream: a compression means that makes it possible to compress the air
stream to a pressure P1 of between 1.15 bar abs and 2 bar abs, an adsorption unit of TSA type, and a cryogenic
distillation unit, with the adsorption unit comprising at least two adsorbers A and B each having a parallelepipedal casing arranged horizontally and comprising: an air
stream inlet and an air stream outlet, a
fixed bed adsorbent
mass, likewise of parallelepipedal shape, the faces of which are parallel to the faces of the casing; and a set of volumes allowing the air stream to pass through the adsorbent
mass horizontally, over the entire cross-section and throughout the entire thickness thereof.