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在Aspen Plus软件平台上开展了以碳酸二甲酯(DMC)和苯酚(Ph OH)为原料、反应精馏塔合成碳酸二苯酯(DPC)的模拟研究。利用实验测定的化学反应平衡常数和反应动力学数据,通过一种调优方法对反应精馏塔进行逐步优化,取得了优化的设计参数。结果表明,反应塔板上液体持液量大小对反应精馏过程有重要影响,当持液量小于0.2 m3时,塔板上的酯交换反应由反应动力学控制,当持液量大于0.5 m3时,塔板上的化学反应接近平衡,反应精馏过程由化学平衡控制。通过对设计参数进行优化,反应精馏塔中Ph OH和DMC的转化率分别达到29.22%和22.01%,DPC收率达到7.21%,而在相同条件下用釜式反应器合成DPC时Ph OH和DMC的转化率仅为7.8%和7.5%,表明了反应精馏技术的优越性。
A simulation study on the synthesis of diphenyl carbonate (DPC) from a reactive distillation column using dimethyl carbonate (DMC) and phenol (Ph OH) as raw materials was carried out on Aspen Plus software platform. Based on the experimentally determined chemical reaction equilibrium constants and reaction kinetics data, the reaction distillation column was optimized step by step through a tuning method, and optimized design parameters were obtained. The results show that the liquid holding capacity of the reaction tray has an important influence on the reactive distillation process. When the holding capacity is less than 0.2 m3, the transesterification reaction on the tray is controlled by the reaction kinetics. When the holding capacity is more than 0.5 m3 , The chemical reaction on the tray is near equilibrium and the reactive distillation process is controlled by the chemical equilibrium. Through the optimization of the design parameters, the conversion rates of PhOH and DMC in the reaction distillation column reached 29.22% and 22.01%, respectively, and the yield of DPC reached 7.21%. Under the same conditions, DMC conversion rate of only 7.8% and 7.5%, indicating the superiority of reactive distillation technology.