The utility model provides a stripping tower, be equipped with the tower body, the top of tower body is equipped with the entry of thick ACH raw materials, the bottom of tower body is equipped with the export of ACH product and the import of the poor nitrogen gas body, be equipped with a plurality of minutes liquid dishes in the tower body, all be equipped with the packing layer on the every branch liquid dish, divide liquid to coil rather than being equipped with the circulation heating pipeline between the packing layer that corresponds, tower body one side is equipped with the gas -liquid separation jar, gas -liquid separation jar upper portion is equipped with gas -phase inlet pipeline and gas exports pipeline, gas -liquid separation tank bottoms portion is equipped with liquid phase export pipeline, the gas -phase inlet pipeline meets with the top of tower body, liquid phase export pipeline divides the circulation heating pipeline of liquid dish to meet through delivery pump and the top, be equipped with the liquid level control system of control delivery pump work in the gas -liquid separation jar. The utility model discloses an if the gas -liquid separation jar, the liquid of smuggleing stripping tower secretly separates, reaches both to satisfy the low reaches distillation column and do not increase rich nitrogen, again can the unnecessary component of effective recycling, can at the design criteria within range, produce qualified ACH product with putting in order tower temperature control.