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[1] https://www.cpchem.com/what-we-do/solutions/aromatics/products/cyclohexane#:~:text=Most cyclohexane goes into the,for benzene in many applications.
A plant to produce cyclohexane by the hydrogenation of benzene has been designed. To obtain good heat control, three reactors are used in series. The process has a large recycle of unreacted hydrogen, a small quantity being purged to control the buildup of inerts in the system. The recycle is typically five times the fresh hydrogen feed to the process, and so it plays a major part in the costs of operating the process.