Study on Continuous Catalyst Reformer and Catalyst Regeneration Process

Regeneration of coked catalyst in a naphtha reformer is studied based on the
effectiveness of rate coke bum off. Catalyst is temporarily deactivated by the coke
deposits which are burnt in the regeneration for the catalyst reactivation. Catalyst gets
deactivated by coke deposition blocking the active sites and reduces the selectivity of
catalyst and the products yields. For predicting the behavior subject to catalyst
deactivation, coking rate equation and the kinetic model is obtained. All reformers are
moving bed and radial flow reactors. The coked catalyst are moved continuously and
slowly from the reactors, withdrawn from the last reactor regenerated in a regeneration
section and returned to first reactor as fresh catalyst. Coke content on the catalyst
increases with residence time of catalyst. Catalyst deactivation is directly proportional to
the amount of coke deposits on the catalyst. To understand and contribute to this
problem, a modeling of the regeneration of coked catalyst particles (Pt-Al203) are used
as model catalyst to (I) determine of the intrinsic and effective kinetics of coke bum-off
(2) characterization of the catalyst's on influence of the temperature on the pore
effectiveness factor, rate of mass transfer, and reactivity of coked catalyst (3) Influence
ofcarbonload on porosity and tortuosity of the catalyst. With this information, modeling
of the coked catalyst regeneration is produced.