Coupling non-isothermal trickle-bed reactor with catalyst pellet models to understand the reaction and diffusion in gas oil hydrodesulfurization  

作　　者：Xingqiang Zhao Changfeng Yang Mengke Lu Yao Shi Gang Qian Xinggui Zhou Xuezhi Duan 

机构地区：[1]State Key Laboratory of Chemical Engineering,East China University of Science and Technology,130 Meilong Road,Shanghai 200237,China

出　　处：《Chinese Journal of Chemical Engineering》2020年第4期1095-1106,共12页中国化学工程学报（英文版）

基　　金：supported by the National Key R&D Program of China(2018YFB0604500);the National Natural Science Foundation of China(21922803 and 21776077);the Shanghai Natural Science Foundation(17ZR1407300 and 17ZR1407500);the Program for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutions of Higher Learning;the Shanghai Rising-Star Program(17QA1401200);the Open Project of SKLOCE(SKL-Che-15C03);the 111 Project of the Ministry of Education of China(B08021)。

摘　　要：In this work,a trickle-bed reactor coupled with catalyst pellet model is employed to understand the effects of the temperature and catalyst pellet structures on the reaction-diffusion behaviors in gas oil hydrodesulfurization(HDS).The non-isothermal reactor model is determined to be reasonable due to non-negligible temperature variation caused by the reaction heat.The reaction rate along the reactor is mainly dominated by the temperature,and the sulfur concentration gradient in the catalyst pellet decreases gradually along the reactor,leading to the increased internal effectiveness factor.For the fixed catalyst bed volume,there exists a compromise between the catalyst reaction rate and effectiveness factor.Under commonly studied catalyst pellet size of 0.8-3 mm and porosity of 0.4-0.8,an optimization of the temperature and catalyst pellet structures is carried out,and the optimized outlet sulfur content decreases to 7.6 wppm better than the commercial level at 0.96 mm of the catalyst pellet size and 0.40 of the catalyst porosity.

关 键 词：HYDRODESULFURIZATION Catalyst pellet Trickle-bed reactor Coupling model Reaction-diffusion behavior 

分 类 号：TE624.5[石油与天然气工程—油气加工工程]