乙烯利重排器的模拟分析与设计优化

Simulation and optimal design of the isomerization reactor in ethephon process

重排是乙烯利生产中的关键步骤,本文建立了重排反应器数学模型,模拟表明重排器中物料停留时间不足,三(2-氯乙基)亚磷酸酯转化率低;预热和反应的高度耦合导致重排器操作范围窄、装置稳定性差。模拟结果与装置实际情况一致。因此,对重排器进行了优化设计,将其分解为预热器和重排反应器。结果表明通过优化设计,重排过程的操作稳定性大大加强,控制了反应器飞温,提高了亚酯转化率,减少了副反应的发生;并且新的重排工艺可以利用反应热预热原料,过程能耗降低。

Isomerization is a key step in ethylene production.In this paper,a mathematical model of the isomerization reactor is established.Simulation shows that the residence time is insufficient and conversion is low,highly coupling preheat and reaction lead to a narrow operation range and poor stability in the isomerization unit.The simulation is consistent with the unit condition.Optimal design of isomerization reactor is carried out by decoupling it to a pre-heater and an isomerization reactor.Optimal design shows that operation stability of the isomerization reactor is significantly enhanced,temperature runaway of reactor is controlled,side reaction is reduced and conversion is improved.And in the new isomerization process,reaction heat can be used to preheat feed stock so as to reduce energy consumption.