Nozzle element of mass exchange apparatus comprises a shell made in the form of a round straight cylinder with open bases, as well as an inner shell with a square cross-section and open bases coaxially placed inside it. Wherein, both shells are interconnected by four radial partitions made as one piece with them, which are located in the middle of the inner shell faces. The element is also equipped with additional radial partitions passing through the ribs of the inner shell.