Study of the effect of operating parameters on the performance of acetylene hydrogenation reactors

Ghiyami, Taha; Shahraki, Farhad; Sadeghi, Jafar; Bayat, Mehdi

Study of the effect of operating parameters on the performance of acetylene hydrogenation reactors

Document Type : Original Research

Authors

T. Ghiyami ¹

F. Shahraki ²

J. Sadeghi ¹

M. Bayat ³

¹ Department of Chemical Engineering, University of Sistan and Baluchestan, P.O. Box 98164-161, Zahedan, Iran

² Department of Chemical Engineering, Shahid Nikbakht Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran

³ Department of Chemical Engineering, University of Bojnoord, Bojnoord, Iran

Abstract

Abstract

Research subject: Ethylene is a very important material in petrochemical industries, whose chief application is producing polymers such as polyethylene. The steam cracking of ethane or naphtha is commonly used to produce ethylene. A small amount of acetylene is produced in this process. The amount of acetylene in the product stream should not exceed 1 ppm, because it is harmful to polymerization catalysts in downstream units. The acetylene hydrogenation unit is designed for acetylene removal in industrial plants. In this unit, the removal of acetylene up to 1 ppm in the product stream and ethylene’s selectivity are of great importance.

Research approach: In this paper, the modeling and the dynamic simulation of acetylene hydrogenation reactors of Marun petrochemical complex with considering catalyst deactivation are presented. Then, here investigated is the effect of the operating conditions such as temperature, pressure and flow rate of the reactor feed on the amount of outlet acetylene as well as ethylene’s selectivity.

Main results: The simulation results show that in order to compensate for catalyst deactivation, it is necessary to gradually increase the reactor inlet temperature. With a linear increase in the inlet temperature of the reactors from 55 to 90 ˚C in a period of 720 operating days, the amount of outlet acetylene and ethylene’s selectivity are decreased. The reactions of acetylene to ethylene and ethylene to ethane are increased by increasing the inlet temperature of acetylene hydrogenation reactors. By increasing the feed flow rate from 50 to 100 kg/s, the amount of outlet acetylene and ethylene’s selectivity are increased. The residence time is decreased by increasing the feed flow rate and thus the conversion of acetylene to ethylene is decreased (increasing the outlet acetylene in the product). The amount of outlet acetylene and ethylene’s selectivity are decreased by decreasing the inlet pressure from 40 to 33 barg.

Keywords

Reactor

Hydrogenation

Acetylene

Ethylene selectivity

simulation

Subjects

metalic

[1]. Rahimpour M., Dehghani O., Gholipour M., Yancheshmeh M. S., Haghighi S. S. and Shariati A., A novel configuration for Pd/Ag/α-Al2O3 catalyst regeneration in the acetylene hydrogenation reactor of a multi feed cracker, Chemical engineering journal, 198, 491-502, 2012.
[2]. Vincent M. J. and Gonzalez R. D., A Langmuir–Hinshelwood model for a hydrogen transfer mechanism in the selective hydrogenation of acetylene over a Pd/γ-Al2O3 catalyst prepared by the sol–gel method, Applied Catalysis A: General, 217, 143-156, 2001.
[3]. Schbib N., Errazu A., Romagnoli J. and Porras J., Dynamics and control of an industrial front-end acetylene converter, Computers & chemical engineering, 18, 355-359, 1994.
[4]. Gobbo R., Soares R. d. P., Lansarin M. A., Secchi A. R. and Ferreira J. M. P., Modeling, simulation, and optimization of a front-end system for acetylene hydrogenation reactors, Brazilian Journal of Chemical Engineering, 21, 545-556, 2004.
[5]. Dehghani O., Rahimpour M. R. and Shariati A., An Experimental Approach on Industrial Pd-Ag Supported α-Al2O3 Catalyst Used in Acetylene Hydrogenation Process: Mechanism, Kinetic and Catalyst Decay, Processes, 7, 136, 2019.
[6]. Mostoufi N., Ghoorchian A. and Sotudeh-Gharebagh R., Hydrogenation of acetylene: Kinetic studies and reactor modeling, International Journal of Chemical Reactor Engineering, 3, 2005.
[7]. Bos A. and Westerterp K., Mechanism and kinetics of the selective hydrogenation of ethyne and ethene, Chemical engineering and processing: process intensification, 32, 1-7, 1993.
[8]. Urmès C., Schweitzer J.-M., Cabiac A. and Schuurman Y., Kinetic Study of the Selective Hydrogenation of Acetylene over Supported Palladium under Tail-End Conditions, Catalysts, 9, 180, 2019.
[9]. Ren Feng L. P., Fengwu Li, Daidi Xu, Ronghui Shi, Libo Dai, Ji-Jun Zou, Min Zhang, The kinetic mechanism of acetlene hydrogenation to prepare ethane over FexOy clusters: A DFT study, Chemical engineering science, 230, 116170, 2021.
[10]. Zhu XU S. Z., Mingyuan Zhu, Ni catalyst supported on nitrogen-doped activated carbon for selective hydrogenation of acetylene with high concentration, Catalysis Communications, 149, 106241, 2021.
[11]. Kai Li T. L., Junyi He, Ben WL Jang, Selective hydrogenation of acetylene over Pd/CeO 2, Frontiers Chemical Engineering Science, 1-8, 2020.
[12]. BS Bal'zhinimaev E. P., EV Kovalev, Selective hydrogenation of acetylene on Pd fiberglass catalysts, Catalysis in Industry, 12, 56-65, 2020.
[13]. Yang Guo J. X., Lijuan Jia, Yuzhen Shi, Jian Zhang, Qiuling Chen, Qingqing Guan, Preparation of MoS2 nanosheets to support Pd species for selective steerable hydrogenation of acetylene, Journal of Material Science, 56, 2129-2137, 2021.
[14]. Schbib N. S., García M. A., Gígola C. E. and Errazu A. F., Kinetics of front-end acetylene hydrogenation in ethylene production, Industrial & engineering chemistry research, 35, 1496-1505, 1996.
[15]. Godinez C., Cabanes A. and Villora G., Experimental study of the front-end selective hydrogenation of steam-cracking C2-C3 mixture, Chemical engineering and processing: process intensification, 34, 459-468, 1995.
[16]. Rijo B., Lemos F., Fonseca I. and Vilelas A., Development of a model for an industrial acetylene hydrogenation reactor using plant data–Part I, Chemical engineering journal, 379, 122390, 2020.
[17]. Aeowjaroenlap H., Chotiwiriyakun K., Tiensai N., Tanthapanichakoon W., Spatenka S. and Cano A., Model-based optimization of an acetylene hydrogenation reactor to improve overall ethylene plant economics, Industrial & engineering chemistry research, 57, 9943-9951, 2018.
[18]. Azizi M., Zolfaghari Sharak A., Mousavi S. A., Bakhtiari Ziabari F., Shariati J. and Azizi S., Study on the acetylene hydrogenation process for ethylene production: Simulation, modification, and optimization, Chemical Engineering Communications, 200, 863-877, 2013.
[19]. Szukiewicz M. and Petrus R., Selective hydrogenation of an acetylene process: An example of modeling an industrial reactor process, Chemical Engineering & Technology: Industrial Chemistry‐Plant Equipment‐Process Engineering‐Biotechnology, 22, 1059-1061, 1999.
[20]. Fu-Ming Xie F. X., Zhi-Shan Liang, and Luo X.-L., Online estimation for catalyst activity of acetylene hydrogenation reactor, Asia-Pacific Journal of Chemical Eingineering, 15, 2406-24018, 2020.
[21]. Samavati M., Ebrahim H. A. and Dorj Y., Effect of the operating parameters on the simulation of acetylene hydrogenation reactor with catalyst deactivation, Applied Catalysis A: General, 567, 45-55, 2018.
[22]. Mansoornejad B., Mostoufi N. and Jalali-Farahani F., A hybrid GA–SQP optimization technique for determination of kinetic parameters of hydrogenation reactions, Computers & chemical engineering, 32, 1447-1455, 2008.
[23]. Rafiq M. H., Jakobsen H. A., Schmid R. and Hustad J. E., Experimental studies and modeling of a fixed bed reactor for Fischer–Tropsch synthesis using biosyngas, Fuel processing technology, 92, 893-907, 2011.