Diffusion and Catalytic Cracking of 1,3,5 Tri-iso-
propyl-benzene in FCC Catalysts
S.Al-Khattaf1 , J. A. Atias2, K.Jarosch 3, H.de Lasa3*
(1) Chemical Engineering Department, King Fahd University of Petroleum and
Minerals,Dhahran, 31261 Saudi Arabia.
(2) Departamento de Termodinámica y Fenómenos de Transferencia. Universidad
Simón Bolívar, Caracas, Venezuela.
(3) Chemical Reactor Engineering Centre, Faculty of Engineering, University of
Western Ontario, London, Ontario, Canada N6A 5B9.
The present study describes catalytic cracking experiments developed in a novel
CREC Riser Simulator using 1,3,5-Tri-iso-propyl-benzene and two FCC catalysts
with different crystal sizes (0.4-m and 0.9-m diameter). The experiments are
modeled using an unsteady state model for both gas and catalyst phases. It is
found that a quasi-steady state approximation can be used for the catalyst and
changes in the gas phase can be accounted, under the allowed model
simplifications, with a relatively simple unsteady state equation. The model is
completed using two catalytic decay models, with one of them involving a decay
function based on "reactant converted". Experimental and modeling observations