催化精馏合成异丙苯过程模拟

为有效控制催化精馏合成异丙苯过程 ,提出了改进的非平衡级模型。假设在每个非平衡级上汽液固三相间处于等温状态 ,从而使能量衡算方程大大简化。对变量的取值范围进行合理的约束 ,利用 Newton- Raphson法求解能够顺利收敛。与标准的非平衡级模型相比 ,该模型不但在总计算量上减少 2 0 % ,而且在总耗时方面减少 5 0 %。并且改进模型允许使用相对误差大于 15 %的初值。从催化精馏塔轴向的温度及液相组成分布等方面进行比较 ,模拟与试验吻合良好。该模型是一种控制催化精馏的实用方法。

Simulation of catalytic distillation process for cumene synthesis

An improved nonequilibrium stage model is presented to effectively control the catalytic distillation process for cumene synthesis. Thermal equilibrium is assumed among the vapor, liquid and solid phases at each stage so the energy balance is greatly simplified. When the variables are limited to realistic values, a Newton type method can converge quickly. Compared with typical non equilibrium stage model, this model has 20% less total calculation time and 50% less total iteration time. The calculation will converge even if initial value relative error is larger than 15% relative to the converged values. The temperature and concentration profiles in the axial direction in the catalytic distillation column agree with experimental data. The model provides a reliable method to control the catalytic distillation process.