A five-lump model previously reported in the literature was used for the kinetic modeling of an atmospheric residue (312 degrees C+) hydrocracking. The model has ten reaction rate coefficients, makes a distinction of different hydrocarbon groups based on boiling ranges, and includes the following lumps: unconverted vacuum residue (538 degrees C+), vacuum gas oil (VGO; 343-538 degrees C), middle distillates (204-343 degrees C), naphtha (IBP-204 degrees C), and gases. The kinetic study was carried out in a CSTBR at the following operating conditions: 380-420 degrees C, 100 kg(f)/cm(2), 5000 std ft(3) H-2/bbl of oil, and 0.5-1.25 ml(feed)/(ml(cat) h). Experiments were performed with a commercial size tetra lobular catalyst. The model also incorporates the effectiveness factor, and a time-dependant deactivation function for obtaining the intrinsic kinetic parameters. The hydrocracking of vacuum residue, VGO and middle distillates exhibited a higher selectivity toward the heavier lumps as temperature is increased. The predicted product composition is in good agreement with experimental values with an average absolute error less than 5%. (C) 2012 Elsevier Ltd. All rights reserved.