NMP is widely used in aromatics extraction, acetylene, alkene, diene purification, but also for the polymer solvents. N-methyl-pyrrolidone (NMP) 1. Formula : C5H9NO2. CAS no. .: 872-50-4 EINECS: 212-828-13. Use: Widely used in aromatics extraction, acetylene, alkene, diene purification, but also for the polymer solvents and polymerization medium, such as polyamide, polyimide, polyphenylene ...