The headspace gathered more ester compounds in aroma composition than that of reduced pressure distillation.
顶空法富集的芳香成分中酯类化合物含量较减压蒸馏富集法高。
The reduced pressure distillation experiment on the liquid paraffin was done and the Engler distillation curve was obtained.
进行了石蜡油的减压蒸馏实验，得到了恩氏蒸馏曲线。
The high-purity MPC standard sample was obtained by reduced pressure distillation and the removal of minor phenol with dilute sodium hydroxide solution.
反应产物经减压精馏、碱洗、水洗、干燥等精制处理，得到了纯度较高的M PC标准品。
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