Open AccessFLUIDDYNAMIC ASPECTS OF GAS-PHASE ETHYLENE POLYMERIZATION REACTOR DESIGN
Author(s) -
Roberto Guardani,
Antônio Carlos Silva Costa Teixeira,
Esleide Lopes Casella
Publication year - 1998
Publication title -
brazilian journal of chemical engineering/brazilian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.313
H-Index - 52
eISSN - 1678-4383
pISSN - 0104-6632
DOI - 10.1590/s0104-66321998000300006
Subject(s) - entrainment (biomusicology) , freeboard , fluidized bed , bubble , materials science , nuclear engineering , population , polymerization , mechanics , environmental science , chemical engineering , thermodynamics , waste management , engineering , physics , composite material , polymer , sociology , rhythm , acoustics , demography
The relative importance of design variables affecting the fluiddynamic behavior of a fluidized bed reactor for the gas-phase ethylene polymerization is discussed, based on mathematical modeling. The three-phase bubbling fluidized bed model is based on axially distributed properties for the bubble, cloud and emulsion phases, combined with correlations for population balance and entrainment. Under the operating conditions adopted in most industrial processes, the reactor performance is affected mainly by the reaction rate and solids entrainment. Simulation results indicate that an adequate design of the freeboard and particle collecting equipment is of primary importance in order to produce polymeric particles with the desired size distribution, as well as to keep entrainment and catalyst feed rates at adequate levels