Abstract: A two-dimensional quasi-homogenous mathematical model has been developed on the basis of the two-dimensional flow model to simulate the axial-radial flow reactor for dehydrogenation of ethylbenzene to styrene under reduced pressure in this paper.The mathematical model is solved by using the finite difference method.The results show that the conversion of the axial-radial flow reactor is higher by 0.1%～0.6% than the radial flow reactor whereas the selectivity is approximately same and there is a low temperature and high styrene concentration area in the catalyst sealing zone.The model is verified by the data of a commercial axial-radial flow reactor for ethylbenzene dehydrogenation and can be used to guide its design.

摘要： 在轴径向反应器二维流动模型的基础上导出了基于二维流动的二维拟均相反应器模型 ,应用有限差分法求解此模型 ,发现轴径向反应器反应转化率略高于相应的径向反应器 0 .1%～ 0 .6 % ,而选择性两者基本相同 ;同时得出催化剂封中流体的二维流动使得轴径向反应器的温度场和浓度场极其复杂 ,对于乙苯脱氢反应 ,在催化剂封区域存在一个低温区和高苯乙烯浓度区 .此反应器模型得到了年产 3万吨乙苯脱氢轴径向反应器的工业数据的证实 ,可用于指导轴径向反应器的设计