传质与反应耦合的乙烯氧化反应器模型与分析

以乙烯氧化生产乙醛的外循环鼓泡塔反应器为对象,建立了传质和反应耦合的数学模型,该模型为刚性常微分方程组,采用Gear算法求解。通过用散热率参数对初始模型进行修正,使模型计算值与工业生产数据基本一致,尤其是汽相中水的流率计算更加准确。对影响反应器操作因素的模拟分析表明,pH值、钯浓度、液体循环量、系统压力的增加均能提高乙烯转化率,而总铜浓度的增加则降低乙烯转化率。所建立的模型和模拟方法及计算结果对于乙醛工业生产过程的扩能改造具有指导作用。

Modeling and analysis of oxidation reactor of ethylene coupled mass-transfer and reaction

A mathematic model coupled mass-transfer and reaction to match bubble column reactor with outside circulation for liquid-phase catalytic oxidation of ethylene was established.The Gear algorithm was adopted because the model was a kind of stiff ordinary differential equations.A parameter of heat loss ratio was used to correct the model,and the calculated value was in accordance with the industrial data,especially the calculated value of mole flow rate of water in vapor phase was more precise.The results show that the fractional conversion of ethylene increases with increasing pH,the mole concentration of Pd and recycle flow rate,but the fractional conversion of ethylene decreases with increasing the mole concentration of total copper.The model and its results may act as a useful guide to industrial process revamping of acetaldehyde.