A device for separating at least one component from a gas mixture, comprising at least a pair of adsorber units, each adsorber unit comprising an envelope defining an inner volume having a lower end zone and an upper end zone, at least one adsorbent layer between the lower and upper end zones, a first conduit means having one end communicating with the lower end zone, and a second conduit means having one end communicating with the upper end zone, wherein the adsorber units of the pairs are superposed and one of the first and second conduit means of each adsorber includes a vertical central tube portion, the vertical central tube portions of the pair of adsorber units being mechanically interconnected in endwise abutting relationship.