Ionic liquid-based mixed solvent for C 5 separation

The invention discloses an ionic liquid-based mixed solvent for C 5 separation, falling into the field of organic chemical industry. The mixed solvent includes (by weight percentage) ionic liquid 1-50, electrolyte salt 0.5-20, and main solvent N-methyl pyrrolidone (NMP) in balance. The mixed solvent separates C 5 components through extractive distillation, and can improve relative volatility of C 5 components, reduce ratio of solvent and production cost, and save material consumption and energy consumption.