填料毛细管精馏传质效率影响因素的数值计算  

Numerical calculation of influencing factors of mass transfer efficiency in capillary distillation of packing

作　　者：李飞 阮锦程 裴东号 曹军[1] LI Fei;RUAN Jin-cheng;PEI Dong-hao;CAO Jun(School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学机械与动力工程学院,上海200237

出　　处：《化学工程》2022年第1期61-66,共6页Chemical Engineering(China)

基　　金：上海市自然科学基金面上项目(18ZR149000);上海市自然科学基金面上项目(20ZR1413200)。

摘　　要：毛细管精馏通过利用毛细结构内固液分子相互作用力和微孔结构界面曲率影响,改变混合液的气液平衡,实现对共沸溶液的分离。为探究毛细管精馏的操作条件对气液相间传质效率的影响,通过使用CFD数值模拟研究影响乙酸乙酯-乙醇混合溶液相间传质的因素,如气相进口速度、气相进口质量分数和孔隙率。结果表明:气相速度越大,会降低对乙酸乙酯的分离效率;填料孔隙率为0.5时,对乙酸乙酯的分离效果较好;气相进口乙酸乙酯质量分数的增大会降低乙酸乙酯的分离效率。并使用Materials Studio软件对分子间作用力进行计算,结果发现填料与乙醇的结合能较强,进而促进乙酸乙酯的分离。研究对于开发适合工业应用的填料毛细管精馏分离共沸溶液技术具有一定的参考意义。Capillary distillation changes the gas-liquid equilibrium of the mixed liquid through the interaction force of solid-liquid molecules in the capillary structure,as well as the influence of the interface curvature of the microporous structure to realize the separation of the azeotropic solution.In order to investigate the effect of the operating conditions of capillary distillation on the mass transfer efficiency between gas and liquid phases,the CFD numerical simulation was used to study the mass transfer influence factors between the gas and liquid phases of ethyl acetate-ethanol solution,such as gas phase inlet velocity,gas phase inlet mass fraction as well as the packing porosity.The results show that the higher the gas velocity is,the lower the separation efficiency of ethyl acetate will be.A better separation effect of ethyl acetate can be obtained when the packing porosity is 0.5.Furthermore,the separation efficiency of ethyl acetate will be decreased with the increase of the concentration of ethyl acetate at the gas inlet.In addition,the Materials Studio software was used to calculate the intermolecular forces of the two components of ethyl acetate-ethanol solution.The results show that the binding energy between the packing and ethanol is stronger,which can promote the separation of ethyl acetate.The research of this study is helpful for the development of the separation technology of azeotropic solution by packing capillary distillation,which is suitable for industrial application.

关 键 词：毛细管精馏 共沸物 CFD 结合能 

分 类 号：TQ021.1[化学工程]