分餾,精餾

As the solution to be purified is heated, its vapors rise to the fractionating column. 當(dāng)要被提純的液體受熱時(shí)，它的蒸汽上升到分餾柱。

Reaction is carried out under a fractionating column that allows aldehyde to pass but returns alcohol to the reaction vessel. 反應(yīng)是在裝有分餾柱的反應(yīng)器中進(jìn)行的，分餾柱能讓醛通過(guò)但使醇回流到反應(yīng)器中。