Abstract: A liquid distributor for a separation device is provided. The liquid distributor comprises at least one pre-distributor member positioned above a plurality of distributor members. The at least one pre-distributor member comprises at least two troughs each comprising a plurality of discharge openings. Each two of the at least two troughs are connected with each other, and a first trough has an overflow portion and at least one deflector attached to the overflow portion or a side wall of the first trough. A second trough has an upper edge. If a liquid level in the first trough reaches the overflow portion, the at least one deflector extends from above the upper edge of the second trough to the second trough so that liquid flows into the second trough from the first trough over the overflow portion or the side wall and the at least one deflector.