Modeling the reforming of straight-run gasoline (fraction 85–140°C) with allowance for the deactivation of Pt catalyst

Abstract

A kinetic model of reforming is developed that describes the chemical transformations of С6–С8 pseudocomponents over Pt catalyst. The composition of platformate is predicted in light of the activity of the metal and acid sites, and temperature profile in the reactors. Equations of mass and heat balance are used in the calculations. The rate constants and activation energies of individual reactions are determined for catalyst of the R-134 series. The stationary activity values (a s = 0.8) are calculated along with the constants of the deactivation of acid (0.0056 ± 0.0004 min−1) and metal (0.079 ± 0.003 min−1) sites at Т = 490°C. The relative error of platformate composition modeling for benzene, toluene, and xylenes does not exceed 5%. It is shown that the stability of platformate composition is due to a stepwise temperature increase in the reactors during the periods between regenerations. It is proposed that the developed model be used to select temperature regimes for the operation of aromatic-producing industrial complexes in order to obtain platformate of desired compositions.