Used to produce a-pyrrolidone, 1-Methyl-2-pyrrolidinone, polyvinyl pyrrolidone, and α -Acetyl-γ -butyrolactone;

used as anaesthetic and tranquilizer, used to produce ciprofloxacin and interferon, as the intermediate of vitamin and rolicyprine;

As antioxidant, plasticizer, extractant, adsorbent, dispersant, fixative and curing agent;

Used in battery, capacitor and development of color film