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苯乙酮是一种重要的有机化工原料,广泛地应用于食品、药品和化妆品等行业。工业上一般是以乙苯为原料、环烷酸锆为催化剂,通过空气氧化法合成苯乙酮,该反应容易生成α-苯乙醇等副产物。由于它们具有相似的物理化学性质,采用普通的蒸馏方法很难实现两种组分的分离。在前期研究的基础上,采用分子蒸馏、薄膜蒸发与精馏耦合技术对等质量混合的苯乙酮与α-苯乙醇混合物进行分离。首先对影响分离的因素如系统温度、压力和回流比对两种组分的得率和纯度的影响进行优化,分别得到轻、重两种组分。进一步对纯度高的苯乙酮混合物的分离工艺进行研究,通过优化系统温度、压力和回流比对混合物的分离进行研究。实验结果表明,经过两次分离后,苯乙酮的纯度从50%上升至99.12%,得率为80.23%。该研究为具有相近沸点的二元组分的分离提供了一定的参考。
Acetophenone is an important organic chemical raw materials, widely used in food, medicine and cosmetics industries. The industry generally takes ethylbenzene as raw material and zirconium naphthenate as catalyst to synthesize acetophenone by air oxidation method, and the reaction easily produces by-products such as α-phenylethanol. Due to their similar physicochemical properties, it is difficult to achieve the separation of the two components by conventional distillation methods. Based on the previous studies, a mixture of acetophenone and α-phenylethanol of equal mass was separated by molecular distillation, thin-film evaporation and distillation coupling. First of all, the influence of separation factors such as system temperature, pressure and reflux ratio on the yield and purity of two components were optimized to obtain light and heavy components respectively. The separation of acetophenone mixture with high purity was further studied, and the separation of the mixture was studied by optimizing the system temperature, pressure and reflux ratio. The experimental results show that the purity of acetophenone increases from 50% to 99.12% with the yield of 80.23% after two separations. This study provides a reference for the separation of binary components with similar boiling points.