Modeling of the molecular weight distribution and short chain branching distribution of linear low-density polyethylene from a pilot scale gas phase polymerization process

Molecular weight distribution (MWD) and short chain branching (SCBD) play a decisive role in the performance of linear low-density polyethylene (LLDPE). A model based on non-standard polymerization reaction scheme is developed for ethylene/α-olefin gas phase copolymerization fluidized bed reactor. Experimental MWD SCBD are simultaneously deconvoluted. The results obtained by this simultaneous deconvolution method physically more relevant. Reduction parameters parameter estimability analysis conducted to screen obtain subset reliable estimation. estimated yields which good agreement with experimental ones several LLDPE grades from pilot-scale process. depicts well “comonomer effect” - activation dormant ethylene species.