Research And Development Of Two-stage Benzene Hydrogenation Multiple-phase Reactor Based On Phase Coupling

Before the research on multiple-phase reactor, the kinetics of benzene hydrogenation in liquid-phase is studied after eliminated the external and internal diffusion, the effects of temperature and pressure of H2 to the reaction rate is investigated. Research shows that the reaction is zero-order for benzene while first-order for hydrogen. Internal diffusion caused by mass transfer of hydrogen in the catalyst. Effective diffusion coefficient, Thiele modulus, diffusion coefficient can be got by calculating the experiment data. The tortuosity factor of catalyst is 3.12. The radial distribution profile of hydrogen concentration in the liquid phase shows that the internal diffusion resistance of hydrogenation is a controlling factor.A two-stage benzene hydrogenation multiple-phase reactor is designed and built on the base of material and energy balance calculation. Then the performance of reactor is tested. Result shows that the chemical heat release can support around 30%of the energy need in the slurry bed reactor. The study of reciprocal effecting of factors such as hydrogen flow, reaction temperature and pressure, concentration of reactant shows that, reaction pressure is the key factor to effect the reaction rate in liquid phase, but temperature for the gas phase in fixed bed. Contribution of internal condensation of reactant in catalyst to reactor performance is also be studied.