Study On Kinetics Of Dehydrogenation Of Methyl Ethyl Benzene To Methyl Styrene And The Whole Process Simulation Analysis

For methyl ethyl benzene dehydrogenation to methyl styrene technology,the influence of various process parameters on the properties of methyl ethyl benzene dehydrogenation reaction,methyl ethyl benzene dehydrogenation reaction kinetics and the whole process simulation of the methyl ethyl benzene dehydrogenation to methyl styrene process were studied in this article.With the industrial dehydrogenation catalyst,the reaction performance of methyl ethyl benzene dehydrogenation was studied in the temperature range of 580-635℃,the steam-to-ratio range of 2.0-4.0,the liquid space velocity range of 0.5-1.5h℃ and the pressure range of 30-101kPa.Through orthogonal experiment and analysis,the order of the main process parameters influence on methyl ethyl benzene dehydrogenation is temperature,steam-to-oil ratio,and liquid space velocity.The most optimal process conditions were recommended for pressure 50kPa(A),temperature 620℃,the steam-to-ratio 2.0 and the space speed 0.5h-1.Based on the reaction data,the kinetics of methyl ethyl benzene dehydrogenation was studied.The reaction network was developed.Based on the different reaction mechanism,three types of kinetics models for methyl ethyl benzene dehydrogenation were developed.By discriminating three models,statistical test results indicated that the two-site-adsorption model was more suitable for the methyl ethyl benzene dehydrogenation reaction than the others,and the model parameters were estimated.The whole process simulation of the methyl ethyl benzene dehydrogenation to methyl styrene process were studied with Aspen software,the process simulation was mainly divided into two section:dehydrogenation unit and distillation unit.The energy consumption of each operation unit was obtained through energy consumption analysis,and the energy saving optimization analysis was carried out for the distillation separation unit.Optimization of the crude methyl styrene tower was made by double-effect advection thermal integration technology.After the simulation analysis,it is concluded that the bottom of the double-effect distillation column can save about 33%,and the tower top energy saving is about 31%.