高校化学工程学报2011，Vol.25Issue(3)：423-429,7.
茂金属催化的丙烯气相聚合过程的单颗粒传质与传热模型
Intraparticle Mass and Heat Transport Model for Gas-Phase Propylene Polymerization Catalyzed with Metallocene Catalysts
摘要
Abstract
Based on the analysis of the catalyst fragmentation during the polymerization, a physical model used to describe the mass and heat transport behaviors of the gas-phase propylene polymerization catalyzed by a silica-supported metallocene catalyst was proposed. Furthermore, a modified multigrain model (MMGM) was obtained by coupling the physical model proposed with the intrinsic reaction of the propylene polymerization.Accordingly, the variation rules of the monomer concentration, mean temperature, temperature gradient and catalyst concentration, etc. in the polymer particles were obtained based on the MMGM. The simulation results show that both the catalyst concentration change and temperature gradient in the polymer particles are very small and the intrapartiele mass transport resistance has a great effect on the polymerization. In addition, the simulation results also show that the silica-supported metallocene catalyst fragmentation happens according to the shell-by-shell way from the surface to the centre oftbe catalyst during the polymerization.关键词
负载茂金属催化剂/丙烯气相聚合/多粒模型/质量与热量传递/催化剂破裂Key words
supported metallocene catalyst/ gas-phase propylene polymerization/ multigrain model/mass and heat transport/ catalyst fragmentation分类
化学化工引用本文复制引用
李华荣,罗正鸿..茂金属催化的丙烯气相聚合过程的单颗粒传质与传热模型[J].高校化学工程学报,2011,25(3):423-429,7.基金项目
中国石油化工股份有限公司资助项目(x505029). （x505029）
