Evaporation differs from distillation in that the vapor usually is a single component,and even when the vapor is mixture,no attempt is made in the evaporation step to separate the vapor into fractions. 区别： 收集挥发组分的方法；分离难度；多组分间相互分离时的 难易程度。Evaporation differs from distillation in that the vapor usually is a single component, and even when the vapor is mixture, no attempt is made in the evaporation step to separate the vapor into fractions. 区别： 收集挥发组分的方法；分离难度；多组分间相互分离时的 难易程度