茂金属催化的丙烯淤浆聚合模型:聚丙烯相对分子质量分布

Model of the Slurry Propylene Polymerization Catalyzed by Metallocene Catalysts: Relative Molecular Mass Distribution of Polypropylene

对负载型茂金属催化的丙烯淤浆聚合过程进行了模拟,模拟过程考虑了聚丙烯单颗粒增长规律及丙烯聚合本征动力学特征,并引入矩方法关联上述模型与聚丙烯相对分子质量分布。由此,建立了聚丙烯相对分子质量分布模型。采用聚丙烯相对分子质量分布模型考察了本征动力学和传质对产物相对分子质量分布的影响。结果表明,丙烯淤浆聚合的开始阶段,扩散阻力对反应的影响比较大,它能够解释相对分子质量分布增宽的原因。

Based on a particle growth and bulk kinetics and coupling with the moment method,a model was suggested to simulate the relative molecular mass distribution（MMD） of polypropylene made via slurry polymerization catalyzed by a silica-supported metallocene catalyst.Therefore,the above model considered the effects of the bulk kinetics and the mass transfer resistance on the MMD.The simulated results showed that the mass transfer resistance could greatly influence the polymerization during its early stage,which could explain why the MMD broadened.