%0 Journal Article
%A OLAFADEHAN, O. A.
%A Sunmola, Opeyemi Praise
%A Adeleke, Jaiyeola
%A Efeovbokhan, Vincent Enon
%A Abatan, Olubunmi G.
%D 2018
%F eprints:12533
%J Applied Petrochemical Research
%K Adiabatic · RFCCU-riser reactor · Catalytic cracking · Seven-lump · Diffusion resistance · ode23t
%P 219-237
%T Modelling and simulation of an industrial RFCCU‑riser reactor  for catalytic cracking of vacuum residue
%U http://eprints.covenantuniversity.edu.ng/12533/
%V 8
%X A one-dimensional adiabatic mathematical model was developed for the riser reactor of an industrial residue fluid catalytic  cracking unit (RFCCU). A seven-lump kinetic model was presented for the catalytic cracking of vacuum residue, taking  cognisance of diffusion resistance, which is a departure from the general norm in the literature. Also, heat transfer resistance  between the fluid and solid phases was incorporated into the energy balances for instantaneous and one-dimensional  vaporization of feedstock. The developed model was a set of twelve coupled, highly non-linear and stiff ordinary differential  equations, ODEs, which was numerically solved with an implicit MATLAB built-in solver, ode23t, designed deliberately  for handling stiff differential equations to circumvent the problem of instability associated with explicit methods. An excellent  agreement was achieved between the industrial RFCCU plant data and the simulated results of this study, with average  absolute deviation being < ± 5% for instantaneous vaporization of feedstock in all cases investigated. Moreover, the simulated  results revealed that half of the reactor was relatively redundant as this accounted for only 3% of the conversion. Hence, the  findings of this study could be useful to the production practice for the Khartoum Refinery Company