Deep Hydrotreating Kinetic Model Of Diesel Oil

The study of diesel hydrotreating（HDT）kinetics and new reactor designing have received extensive attention from researchers.This work mainly analyzes the characteristics of the hydrodesulfurization（HDS）,hydrodenitrogenation（HDN）and hydrodearomatics（HDA）reactions,and analyzes a variety of major factors influencing the HDT reaction results.The role of individual parameters namely temperature,pressure,H₂/Oil and space time are described in details through the kinetic equations.Experiments were carried out in the high-throughput reactor.Diesel oil and commercial cobalt-molybdenum on alumina（Co-Mo/γ-Al₂O₃）were used as the reactant（feedstock）and catalyst respectively.Experiments were done in order to estimate the kinetic parameters under different operating conditions.The reaction was performed under temperature of 300℃ to 360℃,hydrogen partial pressure of 4.4 to 7.4MPa,space time of 0.17 to 1.10h and hydrogen to oil ratio of 200 to 800v/v.HDS,HDN and HDA models were established.Then kinetic parameters of HDS and HDN were estimated using Levenberg-Marquardt algorithm in MATLAB.The numerical solution of the differential equations（Runge-Kutta method）was used to obtain the corresponding calculated value of HDA and Powell method in VB was used for parameter estimation.For HDS the relative error between the experimental and the simulated value appeared to be within 1.15%,the error was small,indicating that the kinetic model built meets the requirements.For HDN the relative error between the experimental and the simulated value appeared to be within 5.5%.Although the error was higher compared to HDS results but for HDN reaction the error seemed to be small,indicating that the kinetic model built meets the requirements.For HDA the average error between the calculated and the experimental values of the mono-aromatic hydrocarbon was 1.11%,for di-aromatic hydrocarbon was 4.57%,and for tri-aromatic hydrocarbon was 22.97%.These relative errors were small indicating that the kinetic model built meets the requirements.