Modeling And Simulation Of A Domestic Bulk Propylene Polymerization Process In One Loop Reactor

The first generation of domestic single-loop bulk polypropylene production technology has been applied in Sinopec of Wuhan branch of 100 kt/a polypropylene production unit. In this thesis, according to the polymerization mechanism and intrinsic propylene polymerization kinetics, the propylene polymerization process has been investigated in the reactor. Based on the experimental data for polypropylene, steady-state simulation has been carried out through the commercial software of Aspen Plus, and the model can present the production situation of the plant. It is a timesaving method with less calculation errors, and can be used to track the loop fusion index in a wide range.In order to reduce the production cost and achieve economic benefit, basd on the steady state simulation results, the operation parameters, such as the reaction temperature, reactor density parameter, T301 operating parameters are all optimized in detail. It is found that for the daily theoretical production capacity, the qualification rate of product and production yield increase, meanwhile, the catalyst consumptions decrease, and the raw materials and steam consumption are clearly reduced.In the present paper, a steady-state model including mass and energy balance equations is developed to explore the loop reactor (the reactor temperature, the product melt flow rate, the isotactic index and yield of polypropylene and so on). In addition, it is also used to figure out the relationship bewteen the inputs and outputs of the loop reactor, the operation parameters for separation system has been optimized.Based on the steady state model, this study shows that the plant is operating in a more steady state and more efficient for economical benefit. After optimizing the operation parameters of the reactor, the catalyst yield has been increased 1kgPP/gcat, and the production rate of the product has been increased by 640 t/a.