Abstract: The invention relates to an apparatus and a plant for separating immiscible liquids.The apparatus includes a cylindrical tank (1) wherein there are provided a separation chamber (2), a heavy liquid phase collecting chamber (3) and a light liquid phase collecting chamber (4), said chambers being separated by a partition in the shape of a funnel (5) opening at its top in the collecting chamber (4) and by radial partitions (6 and 7) which separate the two collecting chambers, the tank (1) moreover containing a toroidal distributor (10) provided with holes (11) directed upwardly and located in the separation chamber (2) at the bottom of funnel (5), as well as a toroidal header (13) arranged at the bottom of said chamber and provided with a vertical riser (15) which opens into the upper portion of the heavy phase collecting chamber (3).