N-METHYL-PYRROLIDONE is a polar non-proton-transfer solvent. It has the advantages of low toxicity, high boiling point, excellent solubility, selectivity and stability. It is widely used in the extraction of aromatics, the purification of acetylene, alkenes, and dienes, as a solvent for polyvinylidene fluoride, an electrode auxiliary material for lithium-ion batteries, desulfurization of syngas, lubricant refining, antifreeze agent for lubricants, extraction agent for olefins by Chemicalbook, solvent for insoluble engineering plastics during polymerization, agricultural herbicides, insulating materials, integrated circuit fabrication, precision instruments and circuit boards in the semiconductor industry, and PVC tail gas recovery, cleaning agents, dye additives, dispersants, etc. It is also used as a solvent for polymers and as a medium for polymerization reactions, such as engineering plastics and aramid fibers. Additionally, it can be used in pesticides, medicine and cleaning agents.