Modeling and simulation of an industrial autoclave reactor for the production of low-density polyethylene (PEBD) / Modelagem e simulação de um reator autoclave para a produção de polietileno de baixa densidade (PEBD)

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

High-pressure polymerization in autoclave reactors is one of the most currently technologies used for production of polyolefins, particularly polyethylene. Pressures until 3000 atm and temperatures covering the range from 150 to 300 DEGREES C are usually employed in this system. In the present work high-pressure ethylene polymerization process to produce low-density polyethylene (LDPE) have been considered. In this work was developed a dynamic mathematical model for an autoclave polymerization reactor that operates in an industry in Brazil. The reactor comprises multiple feed points of monomer, initiator and a powerful agitator, which cause a recirculating nature inside the reactor. In order to consider the imperfect mixing, the reactor is divided into several sections (reaction zones). Each sections is idealized as composed by segments: one CSTR and one PFR segment accounts for the imperfect mixing region. Mass and energy balance are given for each segment of the reactor. The method of moments was used to characterize the average properties of the polymer produced. PID control was used to maintain operation on an unstable steady state point. The set of differential and algebraic equations (for all segments) was solved simultaneously. The results were compared with industrial data and good agreement was obtained.

ASSUNTO(S)

modelos matematicos autoclaves autoclaves polyethylene polymerization reatores quimicos polimerização polietileno mathematical modeling chemical reactors

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