Acetonitrile, also known as methyl cyanide, is a colorless liquid, very volatile, has a special smell similar to ether, has excellent solvent performance, and can dissolve a variety of organic, inorganic and gaseous substances. It has certain toxicity and is infinitely miscible with water and alcohol. Acetonitrile is mainly used as a solvent. For example, as a solvent for extracting butadiene, synthetic fiber and some special coatings. A solvent used in the petroleum industry to remove tar, phenol and other substances from petroleum hydrocarbons. It is used as a solvent for extracting fatty acids from driven vegetable oil in oil industry and a reaction medium for recrystallization of steroids in medicine. In addition, it can also be used to synthesize ethylamine, acetic acid, etc., and has many applications in fabric dyeing and lighting industry