动力学不确定的甲苯二异氰酸酯装置光化反应精馏塔的模拟分析

Simulation analysis of phosgenation of TDI in distillation column with uncertain kinetics

以甲苯二异氰酸酯的实际工业生产为基础,建立胺盐光化反应的数学模型,并计算出反应活化能。针对动力学参数的不确定性,提出一种模拟分析方法。该方法应用Aspen Plus软件,假设胺盐反应完全,对反应精馏塔内不同工况进行指前因子估算及模拟分析。结果表明,胺盐消耗量在第N-1块塔板处出现最小值;不同工况沿塔板温度变化不大;沿塔板液相胺盐摩尔分数变化较大,光气摩尔分数变化较为缓和。

Based on the industrial production of toluene diisocyanate （TDI）, a mathematical model of phosgenation of amine salt is built. The activation energy of the reaction is calculated. Due to the uncertain kinetics, a simulation method is put forward using Aspen Plus. Supposing the amine salt reacts completely, the pre-exponential factors under different operation conditions in distillation column are evaluated and simulated. The results show that, the minimum consumption of amine salt occurs at the N-1 stage. The temperature distribution of reactive stage has little change. The molar fractions of the liquid amine salt along the column plate change a lot, however, the phosgene changes little.