本发明公开一种光气化生产异氰酸酯装置的除水系统和除水方法。通过在光气化生产异氰酸酯装置开车初期，使用溶剂在除水系统中运转，将系统中残留的水分溶解在溶剂中，溶剂回收利用，水分富集外排。该技术可有效降低系统中水分，减少投料后水分存在形成的酸性环境对设备的腐蚀，减少水分与异氰酸酯产品发生副反应。同时可有效降低除水过程中的能耗，缩短溶剂运转除水时间。所述除水系统和除水方法流程简单、操作方便、高效节能。

The invention discloses a water removal system and a water removal method of a device for producing isocyanate by phosgenation. In the initial operation stage of the device for producing isocyanate byphosgenation, a solvent is used in the water removal system to dissolve residual water in the system in the solvent, the solvent is recycled and utilized, and the water is concentrated and discharged. By adopting the technology, the water in the system can be effectively reduced, the corrosion to the equipment in an acidic environment formed by the water after the feeding is reduced, and the sidereaction between the water and the isocyanate product is reduced. At the same time, energy consumption in the process of water removal is effectively reduced and the time of solvent operation and water removal is shortened. The water removal system and the water removal method have the advantages of simple process, convenient operation, high efficiency and energy saving.