Phosphorus pentachloride is mainly used as a chlorination reagent for alcohols, carboxylic acids, amides, aldehydes, enols and Beckmann rearranging reagent. It is used as a chlorination agent and catalyst in organic synthesis. It is a raw material for the production of medicine, dyes, chemical fibers, and also a raw material for the production of phosphoronitrile chloride and phosphoryl chloride.