Acetonitrile is widely used as a solvent in the purification of butadiene in refineries. It is also employed in the pharmaceutical industry for the production of antibiotics and vitamins. In analytical chemistry, it serves as a mobile phase in high-performance liquid chromatography (HPLC) due to its low viscosity and high elution strength. Additionally, acetonitrile is utilized in the manufacture of synthetic fibers and plastics, where it acts as a solvent for spinning and casting processes. It is also found in battery applications, particularly in lithium-ion batteries, where it is used as an electrolyte solvent. In organic synthesis, acetonitrile is a common solvent for various reactions, including nucleophilic substitutions and polymerizations. Its ability to dissolve a wide range of compounds makes it valuable in the extraction of fatty acids and oils from animal and vegetable sources.