Iranian Journal of Chemical Engineering (IJChE)
Scientific Journal

Integrated Simulation and Improvement of the Multi-bed Methanol Synthesis Process with Syngas Recycling and Energy Recovery in Aspen HYSYS

Document Type : Regular Article

Authors

Fatemeh Tavalatifi 1
Samaneh Sami 2
Fatemeh Bashipour 1

1 Faculty of Petroleum and Chemical Engineering, Razi University, Kermanshah, Iran

2 Department of Engineering Sciences, Faculty of Engineering Sciences, Technical and Vocational University (TVU), Tehran, Iran

https://doi.org/10.22034/ijche.2025.535892.1566
Abstract
The synthesis of methanol is a key industrial process, but its performance is constrained by equilibrium conversion, heat dissipation, and energy inefficiencies. This study simulated the multi-bed adiabatic reactor of the Methanol and Derivatives Complex (CP1Z) located in Arzew, Algeria by Aspen HYSYS. Two reactor models were evaluated: the Equilibrium Reactor (ER), based on Gibbs free energy minimization, and the Plug Flow Reactor (PFR), which incorporates detailed kinetics. Both models were validated against industrial plant data to assess predictive accuracy. The ER model demonstrated better agreement with industrial data, particularly for the concentration of methanol (0.36% deviation), and was therefore selected for process improvement studies. Two modifications were introduced. First, recycling unreacted syngas increased the production of methanol from 613 kmol/h to 1800 kmol/h, a 193% improvement. Second, replacing air coolers with a heat exchanger–steam turbine system enabled the recovery of 1100 kW of electricity without reducing the methanol yield. When both modifications were applied simultaneously, the methanol output rose to 1917 kmol/h (+213%), and electricity generation increased to 1763 kW. The integration of the recycling of syngas and waste heat recovery substantially enhances the conversion efficiency, energy utilization, and sustainability of the production of methanol. Since these modifications require no major hardware changes, they offer a practical and scalable strategy for improving the technical, economic, and environmental performance of existing industrial methanol plants. 

Keywords

Aspen HYSYS
Methanol Synthesis
Multibed Reactor
Energy Recovery
Quenching

Subjects

[1] Bozzano G, Manenti F (2016) Efficient methanol synthesis: Perspectives, technologies and optimization strategies. Prog Energy Combust Sci 56:71–105. https://doi.org/10.1016/j.pecs.2016.06.001.
[2] Goeppert A, Czaun M, Jones J-P, Surya Prakash GK, Olah GA (2014) Recycling of carbon dioxide to methanol and derived products – closing the loop. Chem Soc Rev 43(23):7995–8048. https://doi.org/10.1039/C4CS00122B.
[3] Sepahi, S., & Rahimpour, M. R. (2023). Methanol production from syngas. In Advances in Synthesis Gas: Methods, Technologies and Applications, 111-146. 10.1016/B978-0-323-91878-7.00012-5
[4] Olah GA, Goeppert A, Surya Prakash GK (2009) Beyond Oil and Gas: The Methanol Economy. 2nd ed. Wiley-VCH.
[5] Goeppert A, Surya Prakash GK, Olah GA (2012) Renewable methanol from carbon dioxide. ChemSusChem 5(4):763–772. https://doi.org/10.1002/cssc.201100825.
[6] Bertau M, Offermanns H, Plass L, Schmidt F, Wernicke H-J (2014) Methanol: The Basic Chemical and Energy Feedstock of the Future. Springer.
[7] Tabibian, S. S., & Sharifzadeh, M. (2023). Statistical and analytical investigation of methanol applications, production technologies, value-chain and economy with a special focus on renewable methanol. Renewable and Sustainable Energy Reviews, 179, 113281.  https://doi.org/10.1016/j.rser.2023.113281.
[8] Zhang Q, Liu Z, Yu Z, Zhao Y (2023) Methanol economy: A key pathway to carbon neutrality. Energy Convers Manag 285:116933. https://doi.org/10.1016/j.enconman.2023.11933. 
[9] Wang J, Li M, Sun J (2022) Pathways and prospects of methanol economy. Renew Sustain Energy Rev 160:112269. https://doi.org/10.1016/j.rser.2022.112269.
[10] Graaf GH, Winkelman JGM, Stamhuis EJ (1990) Kinetics of methanol synthesis. Chem Eng Sci 45(8):2163–2170.
[11] Waugh KC (2012) Methanol synthesis. Catal Today 168(1):3–9. https://doi.org/10.1016/j.cattod.2010.10.026.
[12] Nestler F, Klose F, Kenig EY (2018) Dynamic moduleing and optimization of a three-bed adiabatic methanol reactor. Chem Eng Res Des 137:611–620. https://doi.org/10.1016/j.cherd.2018.07.031.
[13] Lee S (1989) Methanol Synthesis Technology. Chem Eng Prog 85(4):62–67.
[14] Blumberg W, Jörissen J, Eiden A (2017) Process design for optimized catalyst life in methanol synthesis. J Clean Prod 161:1430–1438. https://doi.org/10.1016/j.jclepro.2017.05.010.
[15] Rostrup-Nielsen JR (2000) New aspects of syngas production and use. Catal Today 63(2–4):159–164. https://doi.org/10.1016/S09205861(00)00381-5.
[16] Pontzen F, Liebner W, Gronemann V, Rothaemel M, Ahlers B (2011) CO₂-based methanol and DME – Efficient technologies for industrial scale production. Catal Today 171(1):242–250. https://doi.org/10.1016/j.cattod.2011.01.031.
[17] Zhao X, Yang Y, Chen H (2020) Exergy analysis and heat integration of methanol synthesis process. Energy 195:117042. https://doi.org/10.1016/j.energy.2020.117042.
[18] Putri, A. F., Arianti, D. F., Rahayu, P. T., & Azizi, R. H. (2025). Reducing Energy Consumption of Methanol Production from Syngas by Modifying Heat Transfer Process. Journal of Chemical Engineering Research Progress, 2(1), 122-131.
[19] Al-Malah KI (2022) ASPEN PLUS: Chemical Engineering Applications. Wiley.
[20] Safari F (2022) Modeling and optimization of methanol production process using Aspen HYSYS. J Clean Prod 363:132588. https://doi.org/10.1016/j.jclepro.2022.132588.
[21] Andreasen, A., & van Baten, J. (2025). Techno-Economic Analysis and Optimization of Gray and Green Methanol Synthesis Using Flowsheet Automation and Surrogate Modeling. Energy & Fuels, 39(6), 3359-3374.
https://doi.org/10.1021/acs.energyfuels.4c05806
[22] Liu J, Karimi IA (2018) Process simulation and optimization of methanol production plant. Chem Eng Trans 70:751–756. https://doi.org/10.3303/CET1870126.
[23] Fossen MA, Halvorsrød J, Narvestad T, Tjemsland S, Timsina R, Eikeland MS (2022) Aspen Hysys simulation of the methanol synthesis based on gas from biomass gasification. Proceedings of the 40th Scandinavian Simulation Society Conference (SIMS 2022), Oslo, Norway.
[24] Wolday AK, Gujarathi AM, Ramteke M (2023) Multi-objective optimization of methanol production for energy efficiency and environmental sustainability. Comput Chem Eng 181:109186. https://doi.org/10.1016/j.compchemeng.2023.109186.
[25] Jiamin, S., Chengcheng, Y., Lijing, Z., & Gang, T. (2023). Aspen plus Simulation and Analysis of Methanol Synthesis Process. In E3S Web of Conferences (Vol. 385, p. 04009). EDP Sciences.
[26] Budhraja N, Pal A, Mishra RS (2023) Optimizing methanol reforming parameters for enhanced hydrogen selectivity in an Aspen Hysiys simulator using response surface methodology. Energy Technol. https://doi.org/10.1002/ente.202300012.
[27] Wang, X., Wang, J., Wei, M., & Yue, Y. (2025). Entropy-Based Stochastic Optimization of Multi-Energy Systems in Gas-to-Methanol Processes Subject to Modeling Uncertainties. Entropy, 27(1), 52. https://doi.org/10.3390/e27010052.
[28] Sidi-Yacoub, I., Ahmed, F., & Ikram, K. (2023). ASPEN-HYSYS Simulation of AREW's Multi-Stage Adiabatic Reactor with Inter-Stage Quenching for Methanol Synthesis. Improved Oil and Gas Recovery, 7.
[29] Froment G (1972) Analysis and design of fixed bed catalytic reactors: Chapter 1pp 1-55. ACS Publications.
[30] Van-Dal ÉS, Bouallou C (2013) Design and simulation of a methanol production plant from CO₂ hydrogenation. J Clean Prod 57:38–45. https://doi.org/10.1016/j.jclepro.2013.06.036.  
[31] Mignard D, Pritchard C (2008) On the use of electrolytic hydrogen from variable renewable energies for the enhanced conversion of biomass to fuels. Chem Eng Res Des 86(5):473–487.
 https://doi.org/10.1016/j.cherd.2007.12.012
[32] Graaf GH, Sijtsema PJJM, Stamhuis EJ, et al. (1986) Chemical Equilibria in Methanol Synthesis. Chem Eng Sci 41(11):2883–2890.
 
Iranian Journal of Chemical Engineering (IJChE)
Volume 22, Issue 3
Summer 2025
Pages 18-33

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