ORGANIC SOLVENT PURIFICATION SYSTEM AND METHOD

An organic solvent purification system, that separates and purifies an organic solvent from a mixed liquid containing an organic solvent such as N-methyl-2-pyrrolidone and water, is provided with: a pervaporation apparatus which is provided with a pervaporation membrane and separates organic solvent and water; a vacuum evaporator which is supplied with the organic solvent recovered from the concentrated side of the pervaporation apparatus; and a distillation apparatus. At least one among (a) the organic solvent diverted from between the concentrated side of the pervaporation apparatus and theinlet of the vacuum evaporator, and (b) a portion of the organic solvent discharged from the gas phase side outlet of the vacuum evaporator is supplied to the distillation apparatus. The organic solvent distilled by the distillation apparatus is mixed with the organic solvent recovered from the vacuum evaporator and is supplied to a supplier of the organic solvent. 一种有机溶剂精制系统，其中，例如从包含N-甲基-2-吡咯烷酮等有机溶剂和水的混合液分离有机溶剂并进行精制，上述有机