Benzoyl chloride (C6H5COCL), also known as benzoyl chloride, is a colorless fuming liquid, with a pungent odor. In the laboratory, benzoic acid and pentachlorophenol can be obtained by distillation under anhydrous conditions. The large-scale preparation of benzoyl chloride can be obtained by the use of chlorinated sulfoxide chloride. The melting boiling point of benzoyl chloride is 1 ℃ and 198 ℃, and the density is 1.212. It belongs to one of the acyl chlorine. Benzoyl chloride is an important intermediate for the preparation of dyes, spices, organic peroxides, pharmaceuticals and resins. Benzoyl chloride is also used in the production of photographic and artificial tannins, and is used as a stimulant in chemical warfare.