Under the assumption of constant molar overflows and relative volatility, a simplified model is developed to study the behavior of the distillation process under consideration. 假定液體持液量和待分離的體系的相對揮發度均保持不變，建立了該塔的一個簡化的模型，由此得到各組分在整個塔中的分佈情況。
If one component changes another component's vapor pressure, or if the volatility of a component is dependent on its percentage in the mixture, the law will fail. 如果一種組分改變另一組分的蒸氣壓，或者說，一種組分的揮發度取決於它在混合物中的百分比，那麼這一定律將歸於失敗。
