Study Of Catalytic Distillation Process Based On The Seepage Catalysts Packing Internal

Three hot issues in the process of the catalytic distillation are catalyst loadingmethod, the matching relationship between reaction and distillation, and catalyticdistillation process design and simulation. A new type of catalytic distillationinternal seepage catalytic packing internal (SCPI) is development. In the perspectiveof hydrodynamics and reactive distillation，the research is developed based on the newinternal around the three hot issues. CFD models and the reactive distillation modelwhich can provide a basis for optimizing the structure of the internal and study thereactive distillation process are established respectively.Models used for predicting pressure drop of SCPI and the height of liquid abovecatalyst bed were built by using different simulation strategies. Taking into accountthe structure of the corrugated metal sheets indirectly, porous media model was usedto acquire the dry pressure drop of SCPI. Pseudo single phase formulation wasutilized to process two-phase flow simulation for irrigated pressure dropdetermination. Euler-Euler two-fluid model was employed to simulate the height ofliquid above catalyst bed and aid designing the height of catalyst containers withavert-overflow baffles. The catalyst bed was treated as a porous medium, which canbe described by the revised Eugen equation. And their accuracy was determined bycomparison of the simulation results and the experimental data.Based on the special structure of SCPI, establish strict continuous mechanismmodel to describe reactive distillation process within the internal. The model is notbuilt on the basis of the traditional theoretical stage concept, but based on the specificstructure of the internal and more accurate in theory. In addition, Graphical UserInterface (GUI) design and the corresponding port design were implemented for eachunit module in order to clearly represent the flow-sheet of catalytic distillation process.Thermodynamic properties package Aspen Properties was integrated into thegPROMS software, to calculate the physical properties. In the process of solving themodel, a new approach was proposed to avoid difficulties connected withconvergence and stability of calculations. This approach was demonstrated to beefficient, it can reduce the simulation time and still accurately predict the results. On the one hand, the mathematical models built in the paper can be used forin-depth study the reactive distillation matching relationship, and can also providetheoretical support for structural optimization of the internals. On the other hand, theresearch methods can provide the guidance for other types of column internals onphysical modeling and mathematical modeling.