Hydraulically sealed crossflow mass transfer tray

A hydraulically sealed crossflow mass transfer tray which is suitable as an internal in separating columns for mass transfer between liquid and gas phases, and has separated channels arranged in parallel to one another which conduct the liquid, and gas passages arranged between the channels which are covered by longer hoods whose two lower longitudinal edges dip into the liquid of the channel and have gas exit slots having directing surfaces which direct the gas exit into the liquid in an oblique direction, in order to generate the direction of the liquid streams in the channels, the longer side of the hood being aligned at right angles to the crossflow direction of the liquid, wherein the directing surfaces of the hoods in at least two consecutive channels in the crossflow directions are aligned in such a way that the liquid in these channels flows in the same direction and the liquid is otherwise conducted in a meandering manner over the totality of the channels.