Abstract:

In view of the problems of traditional phosphorus trichloride production，such as complex process control，poor safety and serious corrosion to equipment，a new method for directly synthesizing phosphorus trichloride by micro reaction technology was studied by using yellow phosphorus and liquid chlorine as raw materials.The influencing factors could be accurately controlled by using micro-reaction technology in this method to ensure the instantaneous mixing of phosphorus and chlorine and efficient mass and heat transfer，so as to achieve the goal of getting greatly increased reaction rate under safe and controllable reaction conditions.The single factor condition experiments were carried out on factors such as reaction material ratio，temperature，residence time，reflux ratio，etc.The preferable conditions were the ratio of phosphorus and chlorine of 0.35∶1，the ambient medium temperature of 75 ℃，the reaction residence time of 60 s and the reflux ratio of 2.The new method shortened the reaction residence time to 60 s，and the yield reached more than 90%，the product quality met the standard of premium product and the safe and continuous production of the product could be realized.

Key words: phosphorus trichloride, yellow phosphorus, chlorine, micro reaction