A unit acting as drop separator and partition base is disclosed, comprising a number of adjacent lamellae, which form through channels for a gas flowing upwards, charged with a first fluid and vertically displaced collector channels for a second fluid flowing downwards. The lower droplet separator piece and the upper partition base piece overlap each other. The unit comprises a deflector device for the through channels, running at least as far as the lower end of the overlapping region, in the lower end region of the inclined lamellae in the longitudinal direction, in order to separate the first and the second fluid from each other. A mixing of the fluids at the outlet end of the through channels is thus avoided.