N-methyl-pyrrolidone widely used in aromatics extraction, acetylene, alkene, diene purification. 1. Formula: C5H9NO2. CAS no. : 872-50-43. Use:Widely used in aromatics extraction, acetylene, alkene, diene purification, but also for the polymer solvents and polymerization medium, such as polyamide, polyimide, polyphenylene sulphide and other engineering plastics and Kevlar fiber.4. Technology data ...