For use in a separation column, a mat element or a beam element has at least: an upper part 2; at least one distributor-collector part (3) having one or more secondary orifices (7i) and at least one main orifice (6), whereby the passage sections of orifices (8) and (7i) are different; and a lower part (4). The distributor-collector part or parts (3) arranged between the upper part (2) and the lower part (4). A sealing element (5a) arranged between the distributor-collector part (3) and the upper part (2), and a sealing element (5b) arranged between the distributor-collector part (3) and the lower part (4). A separation element (8) arranged at distributor-collector part (3), thus delimiting two spaces (3a, 3b) for circulation of fluids.