在分子筛催化剂上苯和多乙苯液相烷基交换反应的数学模型研究

MATHEMATICAL MODELS FOR LIQUID PHASE TRANSALKYLATION OF POLYETHYLBENZENE AND BENZENE

研究了３种层次不同的苯和多乙苯烷基交换反应数学模型，包括两种动力学模型和一种可计算在不同条件下多乙苯转化率的经验数学模型。结果表明，二级反应动力学模型虽可给出正向及逆向反应速率常数ｋ值，但计算精度低；类二级反应动力学模型既可给出正向及逆向反应ｋ值，还能使多乙苯转化率的计算平均相对误差降到５％以下。经验数学模型可给出多乙苯转化率与过程变量关系的等值线图。

Three mathematical models have been investigated for liquid phase transalkylation of polyethylbenzene and benzene on zeolite catalysts.The second order kinetic equation incorporated with DEB equilibrium conversion derived by Butt predicts that the data of DEB conversion deviate a lot from experimental results and its AVRE reaches 14 7%.The rate constant of global,forward and reverse reaction of transalkylation may be calculated by the proposed pseudo second order kinetic model and the AVRE is only 4%.The empirical mathematical model may derive the isolines of DEB conversion rate vs process parameters.