8-lump Reaction Kinetic Model For MIP-CGP Process

Catalytic cracking is one of processes that can transform heavy oil to light fraction,having important position in refineries of China.China has developed several derivative technologies from catalytic cracking for reducing gasoline olefin,among them the MIP technology is the one being widely applied.In order to meet the market demand of light olefins,based on MIP technology,MIP-CGP(Maximizing iso-paraffins process for clean gasoline and propylene)technology was developed to reduce gasoline olefins and produce more propylene simultaneously.This paper carried out reaction kinetic modelling of MIP-CGP process for providing data support for commercial operation optimization.Based on the reaction mechanism of catalytic cracking and the characteristics of MIP-CGP with two reaction zones,8-lump reaction kinetic model was established with the measured data obtained from MIP-CGP unit of Jiujiang petrochemical refinery.The model kinetic parameters were obtained by the MATLAB as a programming platform.The classical Runge-Kutta method was applied to solve differential equations,and the genetic algorithm was applied to optimize the parameters to minimize objective function.22 groups of kinetic parameters were estimated,and the validation result showed that the predicted values were close to measured values.Then the prediction calculation about the influence of reaction temperature and catalyst/oil ratio is carried out.With optimized operating conditions,gasoline yield was increases 2.12%compared with the measured data of original operation conditions.The 8-lump reaction kinetics model for MIP-CGP process is reliable and accurate,and its calculation results and product distribution are in conformity with the rule of catalytic cracking reaction.It can provide data support for commercial operation optimization of MIP-CGP unit of Jiujiang petrochemical refinery.