Single–Stage Synthesis of Propylene from Etylene on the NiO–Re2O7/B2O3–Al2O3 Catalyst. Thermodynamic Analysis and Kinetic Model of the Process
E. A. BULUCHEVSKY, A. V. LAVRENOV and L. F. SAIFULINA
Institute of Hydrocarbons Processing, Siberian Branch of the Russian Academy of Sciences, Ul. Neftezаvodskаya 54, Omsk 644040 (Russia)
Keywords: ethylene, propylene, dimerization, isomerization, metathesis
Abstract
It is demonstrated on the basis of thermodynamic calculations that the synthesis of propylene from ethylene with intermediate formation of n- butenes under equilibrium conditions is most probable within temperature range 450–550 °C with propylene yield up to 50 mass %. In the case of the kinetic control of ethylene dimerization into butene–1, the achievement of propylene yield at a level of 60 mass % is theoretically possible at low temperatures (40–60 °C) and ethylene conversion degree about 80 %. For the NiO–Re2O7/B2O3–Al2O3 catalyst, a kinetic model of the process was constructed. The model provides adequate description of process parameters within temperature range 40–120 °C with ethylene converison degree up to 30 % and propylene yield up to 25 mass %.
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