FCC汽油催化转化动力学模型

Kinetic Modeling of FCC Gasoline Catalytic Reaction

以催化裂化反应机理为基础,将FCC汽油原料及产品按馏程和化学组成进行集总划分。考虑裂化、氢转移、芳构化和缩合等反应,对反应网络进行合理简化,提出了一种接近分子水平的动力学模型。通过参数估算求取14个动力学速率常数、反应活化能和指前因子,建立了汽油催化转化反应的十集总动力学模型。研究结果表明,采用该模型能预测不同反应条件下汽油转化反应产率分布和产品中汽油的烃类组成。

A molecular kinetic model was derived on the basis of catalytic cracking mechanism to represent the cracking reactions and the catalytic conversion reactions. Lumps were defined not only by their boiling range but also by their chemical compositions. A molecular lumped approach was then proposed on the catalytic conversion reactions in which cracking, hydrogen transfer, aromatic cyclization, condensation and yield of dry gas were taken into account. In order to predict the chemical composition of gasoline, fourteen kinetic parameters in the lumping reaction kinetic model were determined by parameter estimation method, then to get fourteen apparent activation energies and fourteen frequency factors. This work showed that the proposed model simulation results were coincident with the experimental data. The proposed model can not only predict successfully the yields, but also give the more information of the chemical component for gasoline, which was in favor of studying the quality improvement of gasoline.