The liquid drawn off from the bottom of the first fractionating column, the primary fractionating column, is fractionated again in another column under low pressure. 从第一个分馏塔即初分塔底部下来的液体，再在低压下进入其余的分馏塔分馏。
As the solution to be purified is heated, its vapors rise to the fractionating column. 当要被提纯的液体受热时，它的蒸汽上升到分馏柱。
Reaction is carried out under a fractionating column that allows aldehyde to pass but returns alcohol to the reaction vessel. 反应是在装有分馏柱的反应器中进行的，分馏柱能让醛通过但使醇回流到反应器中。
