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
a:2:{s:4:"TEXT";s:134:"Institute of Hydrocarbons Processing, Siberian Branch of the Russian Academy of Sciences, Ul. Neftezаvodskаya 54, Omsk 644040 (Russia)";s:4:"TYPE";s:4:"text";}
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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