Abstract: Hydroisomerization of C8-aromatics on bifunctional catalysts is a main approach to commercial production of paraxylene. In the present paper, the selectivity kinetics of hydroisomerization of C8-aromatics on a Pt/zeolite catalyst has been investigated at 380℃, 886kPa, and H2/hydrocarbon ratio of 10 conditions similar to industrial operation. The apparent chemical scheme, in which C8-naphthenes in the reaction system is regarded as a lumped species, is proposed, and the kinetic model for the Hougen-Watson type pseudomonomolecular system is used. The relative rate constant matrix is estimated by the Wei-Prater method. The results explain the reaction mechanism reported in the literature, and fit experimental data. Expressions for purging composition data and row vectors of inverse of modal matrix, which are helpful in simplifying calculation, are developed.

摘要： 八碳芳烃临氢异构化是工业生产对二甲苯的主要方法.本文研究了380℃,886kPa氢烃分子比为10和铂/沸石催化剂条件下这一复杂反应系统的选择性动力学,提出了将系统中八碳环烷作为一个集总组分的宏观化学反应模式,建立了具有拟一级形式的Hougen-Watson型数学模型,用特征向量法求取了相对速度常数矩阵.所得结果与文献报道的反应机理一致并能拟合实验数据.本文提供了在运用特征向量法过程中对组成数据进行清洗的方法和有助于简化计算的模态矩阵之逆矩阵的行向量表达式.