环氧乙烷合成银催化剂宏观动力学及失活分析

GLOBAL KINETICS AND DEACTIVATION OF SILVER CATALYST FOR ETHYLENE OXIDE SYNTHESIS

在工业生产的条件下用无梯度反应器研究了工业颗粒银催化剂上乙烯氧化合成环氧乙烷宏观动力学 ,得到了能反映该系统主副反应特性的双速率方程 .建立了二维非均相反应器模型 ,模拟并比较了工业生产操作数据 。

The global kinetic rate equations of the main and side reactions of ethylene oxide synthesis are studied in a gradientless reactor under industrial operating conditions. The two-dimensional heterogeneous model of fixed-bed reactor is set up for the simulation of industrial reactor. The Crank-Nicholson predictor-corrector method is used in the integration for the gas phase and the iteration method is used for the solid phase. The accuracy of reactor model, global kinetic equations and heat transfer parameters were tested by comparing the calculated values with industrial actual values. These also show that the other transfer parameters cited in the calculation are suitable. The activity correction factors of the main and side reactions are correlated with time by regression of industrial operation data. The main and side reaction deactivation rates of sliver catalyst of ethylene oxide synthesis are also obtained through further research. The deactivation rates are used to forecasting the suitable time when the catalyst should be replaced and to optimize operating conditions in the later period of catalyst activity.