| 摘要 |
PURPOSE:To efficiently recover valuables by adding water to the fraction obtained by distilling a valuable-containing waste solution in the presence of water to separate the same into a water layer containing an alcohol component and an oil layer containing an aromatic hydrocarbon component. CONSTITUTION:An org. waste solution containing an alcohol component, an aromatic hydrocarbon component and an org. component (high b.p. component) having a b.p. higher than that of each of both components is distilled in the presence of water to distill out not only an alcohol component fraction, an aromatic hydrocarbon fraction and a water-containing fraction but also a distillate containing the high b.p. component and water. Subsequently, water is added to the distillate to separate said distillate into a water layer and an oil layer, and the alcohol component is recovered in the water layer and the aromatic hydrocarbon component is recovered in the oil layer. The aforementioned distillation treatment is pref. performed so that the presence amount of water is kept so as to set the content of water in the bottom liquid of a distillation tower to 10-80wt.%. |
