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

doi:10.1016/j.cjche.2020.02.013

Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (4): 1095-1106.DOI: 10.1016/j.cjche.2020.02.013

• Catalysis, Kinetics and Reaction Engineering • Previous Articles Next Articles

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

Xingqiang Zhao, Changfeng Yang, Mengke Lu, Yao Shi, Gang Qian, Xinggui Zhou, Xuezhi Duan

State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China

Received:2019-08-09 Revised:2019-11-09 Online:2020-07-27 Published:2020-04-28
Contact: Xuezhi Duan
Supported by:
This work was 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) and the 111 Project of the Ministry of Education of China (B08021).

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

Xingqiang Zhao, Changfeng Yang, Mengke Lu, Yao Shi, Gang Qian, Xinggui Zhou, Xuezhi Duan

State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China

通讯作者: Xuezhi Duan
基金资助:
This work was 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) and the 111 Project of the Ministry of Education of China (B08021).

Abstract

Abstract: 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.

Key words: Hydrodesulfurization, Catalyst pellet, Trickle-bed reactor, Coupling model, Reaction-diffusion behavior

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

Xingqiang Zhao, Changfeng Yang, Mengke Lu, Yao Shi, Gang Qian, Xinggui Zhou, Xuezhi Duan. Coupling non-isothermal trickle-bed reactor with catalyst pellet models to understand the reaction and diffusion in gas oil hydrodesulfurization[J]. Chinese Journal of Chemical Engineering, 2020, 28(4): 1095-1106.

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

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

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