共沸
If no azeotropes are encountered, both overhead and bottom products may be obtained in any desired purity if enough plates and adequate reflux are provided. 只要不出现恒沸物，只要塔板数足够多，回流量足够大，就可以获得任意纯度的塔顶和塔底产品。
A new combination process of distillation with salt extraction for separating organic solvent-water azeotropes 利用分批精馏和盐效萃取分离有机溶剂水共沸物的新工艺
