丁二烯气相聚合过程中的单体吸附效应和本征动力学模型

MONOMER SORPTION EFFECT AND INTRINSIC KINETIC MODEL FOR GAS PHASE POLYMERIZATION OF BUTADIENE

采用负载型稀土催化剂 ,在搅拌床反应器内进行丁二烯气相聚合动力学的研究 .考察了单体在聚合物小粒子中的吸附效应和单体压力与温度对聚合速率影响 ,在此基础上 。

A self-cleaning stirred bed reactor with double axes was designed to carry out the study on kinetics of gas phase polymerization of butadiene with heterogeneous rare-earth catalyst, especially for solving the problems of 1, 4-cis-polybutadiene particles agglomeration and sticking to the wall of reactor. The effect of diffusion resistance on polymerization rate was investigated. The influence of monomer sorption in microparticle was examined in order to determine the local monomer concentration on the polymer shell surrounding the active sites of the catalyst surface. Flory-Huggins' sorption isothermal instead of classic Henry's law was used to characterize the sorption of 1, 3-butadiene on 1, 4-cis-polybutadiene. Based on the experimental results including the effects of temperature and pressure on polymerization rate, an intrinsic kinetic model was proposed. The simulation result of the model was in good agreement with the experimental data. The model could be applied to similar heterogeneous catalyzed polymerization.