The Real-Time Dynamic Simulation Of Polyethylene Reactor

Based on the feature of polyethylene reactor, the mathematical model of the reactor system is built and real-time dynamic simulation of the reaction process was carried out here for the polyether polyols.Classic polyethylene reactor modeling has always faced a big problem-solving the infinite differential equations simultaneously. The reason is that the macromolecules with different chain and chain length is usually deemed as differential components. A new method called "chain dynamics" was presented here, which can be used to build the rigorous reactor model for the process of polyethylene reaction by using a few reasonable hypothesics and dividing the macromolecules into basic units .In the "chain-analyzing method", we regarded polymer as many chains. It is not the polymer but the chain that is considered as the component of the system. So the model treats the calculating of the reaction rules, the mass balance and the heat balance in the polymer reason as easily as in the reaction of low-molecular-weight substances. This method is very simple. The model is also to be easily understood Similar to the idea of group contribution method, a related method named "chain thermodynamic" was also presented here. Based on the basic properties of each unit, this method has a feature of fast and easy calculation of polymer thermodynamics, which is very difficult to be realized real-time simulation of this fieldThe application of this method has proved that this method can distinctly reflect the dynamic characteristics of polymerization process, and establish the base for simulation of the whole process.