摘要
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。
Simulation study for a reactive distillation column to synthetize diphenyl carbonate（DPC） by the transesterification of dimethyl carbonate（DMC） with phenol（PhOH） was performed in the Aspen Plus platform. By using the chemical equilibrium and reaction kinetics data determined experimentally, an approach to optimizing reactive distillation column was proposed to obtain the design parameters. The results showed that the liquid holdup on the reactive trays have an important influence on the reactive distillation performance, whereby the liquid holdup per tray was less than 0.2 m3 the transesterification reaction was controlled by the reaction kinetics, nevertheless the value was more than 0.5 m3 the reactive distillation was controlled by chemical equilibrium. With the optimized design parameters of reactive distillation column, the conversion of PhOH and DMC could be reach to 29.22% and 22.01%, respectively, which leaded to a yield of DPC by 7.21%. The results state clearly the superiority of a reactive distillation column to synthetize DPC, since only a conversion of 7.8% and 7.5% for PhOH and DMC were attained by using the conventional CSTR reactor with the same operating conditions.
出处
《计算机与应用化学》
CAS
2015年第12期1429-1433,共5页
Computers and Applied Chemistry
基金
国家自然科学基金资助项目(21306179)
关键词
碳酸二苯酯
酯交换
反应精馏
模拟
diphenyl carbonate
transesterification
reactive distillation
simulation
