壳式固定床草酸二乙酯合成反应器模拟分析

Simulation Analysis on Tube-Shell Type Fixed Bed Reactor for Synthesis of Diethyl Oxalate in Gaseous Phase

选取草酸二乙酯(DEO)、碳酸二乙酯(DEC)的合成与亚硝酸乙酯(EN)的分解反应为独立反应,以亚硝酸乙酯、草酸二乙酯和碳酸二乙酯为关键组分,建立管壳式固定床草酸二乙酯合成反应器的一维拟均相模型并进行数学模拟,获得反应器管内轴向上的反应参数分布及不同操作条件对草酸二乙酯合成的影响.模拟计算结果显示。换热介质的温度和原料气中惰性气体的含量对 DEO 合成反应器的热点影响明显,原料气进口温度、进口气量对反应结果影响不显著,原料中 CO 与 EN 比确定为1.5～2较合理。

Mathematical simulation was performed on a tube-shell type fixed-bed reactor for diethyl oxalate （DEO） synthesis. Synthesis of DEO and diethyl carbonate （DEC） and the thermal decomposition of ethyl nitrite （EN） were selected as independent reactions. .An one dimensional mathematical model of the reactor was established. The gas concentration, temperature and pressure profiles inside the reactor tubes were obtained, and the effects of the operation conditions on hot-spot, EN conversion, DEO production rate, DEO selectivity and the pressure drop in the reactor were simulated and discussed respectively, so as to provide design data for developing large scale plant of DEO synthesis. The calculation results showed that the hot-spot in the reactor was largely influenced by the coolant temperature and the inert gas concentration, while the influence of the inlet temperature was negligible. The favorable condition should be 1.5--2 for the ratio of CO to ethyl nitrite.