Acetonitrile, also known as methyl cyanide, is a colorless and transparent liquid that is highly volatile and has a special odor similar to ether. It has excellent solvent properties and can dissolve various organic, inorganic, and gaseous substances. It is toxic and infinitely miscible with water and alcohols. Acetonitrile can undergo typical nitrile reactions and is used to prepare many typical nitrogen-containing compounds, making it an important organic intermediate. Acetonitrile can be used as a solvent for the synthesis of vitamin A, cortisone, carbon amine drugs, and their intermediates. It is also used as an active medium solvent for the production of vitamin B1 and amino acids. It can replace chlorinated solvents and is used in vinyl coatings. It is also used as an extractant for fatty acids, an alcohol denaturing agent, a diene extractant, and a solvent for the synthesis of acrylonitrile fibers. It has many applications in fabric dyeing, lighting, fragrance manufacturing, and photosensitive material manufacturing.