Modeling of Reforming of Straight-Run Gasoline (Fraction 85-140 °C) with Allowance for Deactivation of the Platinum Catalyst

Abstract

A kinetic model was developed for reforming to describe chemical transformations of C₆–C₈ pseudocomponents over a Pt catalyst. The platformat composition was predicted upon taking into account activities of the «metal» and acid centers and the temperature profile through the reactors. Material and heat balance equations were used for calculations. Rate constants and activation energies of individual reactions were determined for the R-134 series catalyst. Stationary activity (as = 0,8), as well as deactivation constants of acid (0,0056±0,0004 min^-1) and «metal» (0,079±0,003 min^-1) centers at T = 490 °C were calculated. In modeling the platformat composition in respect of benzene, toluene and xylenes, the error was no more than 5 % (rel). The stability of the platformat composition was shown to achieve by stepwise elevation of the reactor temperatures during the service length. The developed model can be used for determining the operation temperature regimes in the production of aromatic compound to obtaine the desired platformat compositions.