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针对反应精馏中部分物系存在反应物与生成物相对挥发度较小、难以分离的问题,提出共沸-反应精馏隔壁塔结构。以酯化法制备乙酸乙酯为研究对象,对共沸-反应精馏隔壁塔的操作性能进行了分析。在搭建的1套反应精馏隔壁塔实验装置内进行了相应的实验研究,并用Aspen Plus进行了模拟,模拟结果与实验结果一致性良好;对共沸剂用量、液相分配比、塔顶回流比以及原料乙酸质量分数等因素的影响进行了模拟研究;对共沸-反应精馏隔壁塔进行了节能分析。与传统反应精馏相比,共沸-反应精馏隔壁塔可实现重组分乙酸和中间组分水的清晰分离,有效避免中间组分的返混,提高热力学效率。
In order to solve the problem that some reactants and reactants have relatively low volatility and difficult to separate, some azeotropic-reactive distillation wall separators are proposed. The esterification method for the preparation of ethyl acetate as the research object, the azeotropic - reactive distillation partition wall operating performance were analyzed. The experiment was carried out in a set of experimental equipment of reaction distillation wall-mounted column. The simulation was carried out with Aspen Plus. The simulation results were in good agreement with the experimental results. The effects of the amount of entrainer, the liquid phase distribution ratio, And the influence of the raw material acetic acid mass fraction and other factors were simulated. The energy-saving analysis of the azeotropic-reactive distillation bulkhead was carried out. Compared with the traditional reactive distillation, the azeotropic-reactive distillation bulkhead separation column can realize the clear separation of the heavy acetic acid and the middle component water, effectively avoiding the back mixing of the intermediate components and improving the thermodynamic efficiency.