As an organic solvent, reaction medium, and intermediate in organic synthesis. Extremely versatile. It has high selective extraction ability and is used as a polymerization and condensation solvent for acrylic resins and polysulfone resins, a polymerization and spinning solvent for polyacrylonitrile and acetic acid fibers, an extraction solvent for separating alkanes and aromatics, a reaction medium for aromatic hydrocarbon and butadiene extraction, acrylic fiber spinning, plastic solvent, organic synthetic dyes, pharmaceuticals and other industries. In terms of medicine, it has anti-inflammatory and analgesic effects, and has strong penetration into the skin.