DOI: https://doi.org/10.9767/jcerp.20598

Optimizing Operating Conditions to Increase the Effective Hydrogen Partial Pressure and Reduce Fresh Hydrogen in Vapor-Phase Cyclohexanol Production

Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro, Semarang, Indonesia

Received: 12 Dec 2025; Revised: 19 Dec 2025; Accepted: 22 Dec 2025; Available online: 8 Jan 2026; Published: 30 Jun 2026.
Editor(s): Istadi Istadi
Open Access Copyright (c) 2026 by Authors, Published by Universitas Diponegoro and BCREC Publishing Group
Creative Commons License This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
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Abstract

Cyclohexanol is a vital intermediate in nylon precursor production, making its efficient synthesis highly relevant for large-scale chemical industries. Conventional processes often face inefficiencies such as excessive hydrogen consumption and poor energy utilization, which hinder economic viability. This study aims to optimize cyclohexanol production by improving hydrogen recovery and heat integration. Thermodynamic analysis confirmed the reaction is highly exothermic and favorable across the operating temperature range, emphasizing the need for strict thermal control. Process simulation was then employed to evaluate the baseline flowsheet and identify inefficiencies. A revised configuration was developed incorporating effluent cooling, vapor–liquid separation, and hydrogen recycling. The improved system significantly enhanced hydrogen efficiency, reactor performance, and energy utilization, leading to higher conversion rates and more stable operation. In conclusion, the optimized process demonstrates the importance of integrating reaction engineering with process-level design. The simulation framework also provides a foundation for future studies on intensified reactor–separator systems and advanced energy-saving strategies. Copyright © 2026 by Authors, Published by Universitas Diponegoro and BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

Keywords: Phenol Hydrogenation; Vapor-Phase Reactor; Process Optimization; Hydrogen Recycle

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Section: Original Research Articles
Language : EN
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  7. Foppa, L., Dupont, J. (2015). Benzene partial hydrogenation: Advances and perspectives. Chemical Society Reviews, 44(7), 1886–1897. DOI: 10.1039/C4CS00324A
  8. Radzuan, M.R.A., Nursyahirah, S., Syihabuddin, M.A., Alikasturi, A.S., Faizal, T. A. (2019). Comparative analysis of cyclohexane production from benzene and hydrogen: Via simulation and sustainability evaluator approach. Materials Today: Proceedings, 19, 1693–1702. DOI: 10.1016/j.matpr.2019.11.199
  9. Giarracca, L., Isufaj, F., Lizardo-Huerta, J.C., Fournet, R., Glaude, P.-A., Sirjean, B. (2021). Experimental and kinetic modeling of the ignition delays of cyclohexane, cyclohexene and cyclohexadienes: Effect of unsaturation. Proceedings of the Combustion Institute, 38(1), 1017–1024. DOI: 10.1016/j.proci.2020.07.151
  10. Joseph, W. (2016). Three-phase catalytic reactors for hydrogenation and oxidation reactions. Physical Sciences Reviews, 1(1). DOI: 10.1515/psr-2015-0019
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  12. National Institute of Standards and Technology. (n.d.). NIST Chemistry WebBook: Phenol thermochemical data. Retrieved from https://webbook.nist.gov/cgi/cbook.cgi?ID=C108952&Mask=1E9F
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  15. Cekerevac, Z., Cekerevac, D. (2025). Hydrogen Hazards, Risks, and Protection: an in-Depth Review. MEST Journal, 13(SP), 23–48. DOI: 10.12709/mest.13.13.sp.02

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