Kinetics Of Catalytic Hydrogenation Of C5 Branched Olefins On YN-1 Nickel Catalyst

In the global industrial production of ethylene,C5 fraction is one of its important by-products.Currently,most C5 fractions are used as fuel for cracking furnaces and steam boilers.But only a small part of hydrogen refining can be made into higher value-added products.It is critically important to study how to use C5 fraction well in order to rationally utilize petroleum resources and reduce ethylene production costs.The C5 feedstocks include 3-methyl-1-butene,2-methyl-1-butene and 2-methyl-2-butene in this topic.We calculate the thermodynamic data and the equilibrium molar fraction of each reaction component,so that we can know which reactions are irreversible within the range of operating conditions,and predict the reaction process of subsequent experiments.We use a fixed-bed tubular reactor filled with YN-1(Ni/Al2O3-TiO2)nickel-based catalysts in the kinetics experiment.The single-factor experimental method was used to investigate the reactions with temperature of 393～433 K,pressure of 1.5～3 MPa,and space velocity of 4.1～99.2 h-1 under different catalyst activities.We can get the data about the conversion rate and selectivity of the three kinds of C5 olefins.The results show that the catalytic activity of the catalyst is divided into three stages,which have a decisive effect on the conversion and selectivity of the reaction;the temperature also has a significant effect,and the pressure and space velocity have little influence on the catalytic reaction.And when the three kinds of olefins are mixed,there is a specific equilibrium relationship between the them.According to the intrinsic kinetic data obtained from the experiment,based on the power rate model,we build the kinetic model of the catalytic hydrogenation reaction of the compound which can be 3-methyl-1-butene,2-methyl-1-butene,and 2-methyl-2-butene.And then,we correlate the data to solve the kinetic equation parameters of the hydrogenation and isomerization reactions in the respective reaction process,including the activation energy Ea,the reaction order m and the pre-finger factor A0 at different temperatures T.The statistical method was used to check the significance of the simulation results,and the relative deviation between the calculated and experimental values of the model is within a reasonable range,which proved the rationality of the obtained intrinsic kinetic model.The obtained model has important practical guiding value for subsequent reactor design and process improvement.