Continuous and composite extractive distillation was adopted for extracting high purity propionaldehyde. The experimental apparatus of continuous and composite extractive distillation was set up. θ ring structured packing was used in the rectifying section. The conditions of experiment such as the variety of the number of column plates were studied, and the experimental results were analyzed by gas chromatography. Under the optimal conditions, the mass fraction of propionaldehyde can be increased from 90. 83％ in raw materials to 99. 73％ with the yield of 91.50％. At the same time, the separation results were simulated by Aspen Plus, and the experimental results are consistent with the simulation results. The result of this work can provide the basis for the further research and exaction distillation of refining pure propionaldehyde.%提出了采用连续复合萃取精馏法提取高纯度的丙醛,建立连续复合萃取精馏装置,精馏段采用θ环填料结构,研究了塔板数变化对分离过程的影响,并采用气相色谱分析实验结果.在优化条件下,可以将丙醛的质量分数由原料中的90.83%提高至99.73%,收率为91.50%,同时采用Aspen Plus软件对实验进行模拟,实验值与模拟值基本一致.为进一步放大实验及萃取精馏提取高纯度丙醛提供依据.
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