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. 從第一個分餾塔即初分塔底部下來的液體，再在低壓下進入其餘的分餾塔分餾。
As the solution to be purified is heated, its vapors rise to the fractionating column. 當要被提純的液體受熱時，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. 反應是在裝有分餾柱的反應器中進行的，分餾柱能讓醛通過但使醇迴流到反應器中。
