Technology Profile: Cyclohexane Production from Benzene and Hydrogen
By Intratec Solutions |
This column is based on “Cyclohexane from Benzene and Hydrogen – Cost Analysis,” a report published by Intratec. It can be found at: www.intratec.us/analysis/cyclohexane-production-cost.
Cyclohexane is a relatively stable cycloalkane, present in crude oils in concentrations of 0.1–1.0%. This cycloparaffin is a colorless, flammable liquid, widely used as an intermediate in nylon manufacturing. On a commercial scale, cyclohexane production is almost entirely based on the catalytic hydrogenation of benzene, which can be conducted in the liquid or vapor phase in the presence of hydrogen.
The following paragraphs describe a process for the production of cyclohexane from benzene and hydrogen that involves liquid-phase hydrogenation of benzene in the presence of a nickel-based catalyst. Figure 1 presents a simplified flow diagram of the process.
Figure 1. This flow diagram shows a process for producing cyclohexane[/caption]
Reaction. Initially, benzene is fed to the primary reactor along with fresh and recycled hydrogen. The hydrogenation reaction is carried out in a bubble column reactor, in the presence of a nickel catalyst. The catalyst is maintained in a suspension with the aid of an external circulation loop.…