Recovery method and recovery apparatus of nitrile-based monomer

A recovery apparatus of a nitrile-based monomer, the apparatus comprising:

• a first distillation tower which is supplied with a feed stream comprising a nitrile-based monomer, a nitrogen compound, and water and discharges a lower discharge stream comprising water and an upper discharge stream comprising the nitrile-based monomer, the nitrogen compound, and water;
• a first condenser which condenses the upper discharge stream from the first distillation tower;
• a decanter which is supplied with a discharge stream from the first condenser and separates the stream into a water layer and an organic layer comprising the nitrile-based monomer and the nitrogen compound;
• a second distillation tower which is supplied with the organic layer stream discharged from the decanter and discharges a lower discharge stream comprising the nitrogen compound and an upper discharge stream comprising the nitrile-based monomer and the nitrogen compound;
• a second condenser which condenses the upper discharge stream from the second distillation tower;
• and
• a pump which splits a part of the upper discharge stream from the second distillation tower and refluxes the split stream to the second distillation tower.