Model. Polymerization Mechanism And Polypropylene Production Process Simulation

A dynamic simulation system for propylene polymerization is developed for the propylene polymerization plant of Qianguo Refinery and a rigorous model for propylene polymerization is developed with the Generating Function Method(GFM) to simulate the polymerization process with a super real time speed.Although GFM has been an all-purpose method to solve the calculation of the polymerization reaction in recent years , which has been applied for lots of the steady state simulation and optimization calculation, it is not very popular to deal with the dynamic simulation of polymerization reaction. This paper has developed a rigorous model for propylene polymerization with GFM to simulate the calculation of reaction kinetics of the process of anion coordination polymerization. We not only have gained many technical indexes such as polymerization rate, reaction heat and so on, but also have dynamically worked out the important functional parameters of polymers with this method such as number-average polymerization degree, weight-average polymerization degree and polydisperity index and so on. In respect of reactors, the CSTR model is used to conduct the calculations of the mass balance, energy balance, phase equilibrium and transporting law. Satisfactory results have been gained.In the flash calculation, a constant volume flash model is introduced, which uses "Inside-Out" approach to determine the parameters of phase equilibrium. Thus not only can we guarantee the accuracy and stability, but also meet the demand of the speed of calculations.The simulator developed by this paper is to simulate the process of starting and stopping, operations under normal and abnormal conditions with a super real time speed and has achieved satisfactory results. propylene; polymerization; GFM; rigorous model...