MIP (maximizing iso-paraffins process) process utilizes the technique of linking two reaction zones in series

and hence effectively improves gasoline quality.Cold simulation of MIP reactors can reveal the flow structures in the second reaction zone and also the effects of geometrical structures

but cannot provide the changes in hydrodynamics resulting from catalytic cracking reactions.To capture these changes

this work aimed at carrying out three-dimensional simulation of the MIP reactor by considering the reactions.The simulation was based on the two-fluid model and 12-lump kinetic model.The inter-phase momentum transfer and heat transfer models took into account the effects of multi-scale flow structures

and were compared with the traditional models based on homogeneous state.The simulation found that the multi-scale models could reasonably predict the flow structures and solids volume fraction in the second reaction zone as well as the temperature profiles

compared to the traditional model.For predicting product yields

both models showed similar results.They had good predictions in slurry and diesel

but fail to predict LPG and dry gas.The above finding implied that the effects of multi-scale structures should not only be considered in the momentum transfer and heat transfer models

but also be taken into account in the lumped kinetic model.