POCl 3 is widely used in the production of pesticide, pharmaceuticals, dye, phosphate ester flame retardants and plastic plasticizer, that is the raw material for the production of organophosphorus pesticide herbicides, etc. It is also used to to prepare long-acting sulfonamide drugs in the chlorination reaction, which is an intermediate for the production of dyes, chlorinating agent and catalyst for organic synthesis, and uranium ore extraction agent. In addition, POCl 3 is a solvent for liquid-liquid extraction in nuclear fuel reprocessing and a phosphorus dispersant in semiconductor industry.