带侧线反应精馏-渗透汽化生产乙酸乙酯集成过程模拟与分析

Simulation and analysis of a side stream reactive distillation-pervaporation integrated process for ethyl acetate production

针对乙酸酯化法生产乙酸乙酯分离过程复杂、能耗大的缺点,提出了一种带侧线反应精馏-渗透汽化(RDPV)集成过程。通过反应精馏塔侧线采出和渗透汽化膜组件及时移出水分,促进酯化反应向正反应方向进行,在达到乙酸高转化率的同时使乙酸乙酯产品达到高纯度。研究了反应精馏塔侧线采出位置、采出比、反应段塔板数、精馏段塔板数以及膜组件个数等对年度总成本(TAC)的影响,获得了TAC达到最小的过程参数。与传统双塔精馏分离过程对比,RD-PV集成过程节省能耗26.6%,但膜材料价格对RD-PV集成过程的TAC有较大影响,随着渗透汽化技术的成熟,当膜材料价格低于1913 CNY·m-2时,RD-PV集成过程在经济上占据优势。

Due to the complicated process and huge energy consumption of ethyl acetate production via esterification of acetic acid and ethanol,a reactive distillation and pervaporation integrated process was proposed.The byproduct water was removed from the system through the side stream of the column and membrane modules,which promoted the forward reaction and improved the purity of ethyl acetate.The effect of the process parameters on total annual cost was investigated.The parameters included side stream drawn stage,side stream flowrate ratio,reactive stages,rectifying stages and number of membrane modules.Compared with conventional double-column process,the proposed RD-PV integrated process saved 26.6%energy.Through the investigation,it was found that the price of membrane material had significant effect on the total annual cost of RD-PV integrated process.With the development of pervaporation technology,the RD-PV process would appear economically competitive,when the price of membrane material is lower than 1913 CNY·m^-2.