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Single-Point Intrinsic Viscosity and Density Measurements for In-Line MIMO Control Purposes of a Lumped-Distributed Polymeric System

Authors

  • Márcia P. Vega,

    Corresponding author
    1. Departamento de Engenharia Química, Universidade Federal Rural do Rio de Janeiro, BR 465, km 7, CEP 23890-000, Seropédica, RJ, Brazil
    • Departamento de Engenharia Química, Universidade Federal Rural do Rio de Janeiro, BR 465, km 7, CEP 23890-000, Seropédica, RJ, Brazil
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  • Ernanda Bellumat,

    1. Departamento de Engenharia Química, Universidade Federal Rural do Rio de Janeiro, BR 465, km 7, CEP 23890-000, Seropédica, RJ, Brazil
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  • Enrique L. Lima,

    1. Programa de Engenharia Química/COPPE, Universidade Federal do Rio de Janeiro, Cidade Universitária, CP 68502, Rio de Janeiro, RJ, Brazil
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  • José Carlos Pinto

    Corresponding author
    1. Programa de Engenharia Química/COPPE, Universidade Federal do Rio de Janeiro, Cidade Universitária, CP 68502, Rio de Janeiro, RJ, Brazil
    • Programa de Engenharia Química/COPPE, Universidade Federal do Rio de Janeiro, Cidade Universitária, CP 68502, Rio de Janeiro, RJ, Brazil
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Abstract

Simulation and experimental studies are carried out for peroxide-initiated styrene solution polymerization in a lumped-distributed reactor. Weight-average molecular weight (intrinsic viscosity measurements) and conversion (density data) are the output signals, while the manipulated variables are jacket reactor temperature and feed modifier (tert-dodecylmercaptan) concentration. A simple in-line viscometrical method makes the in-line control of weight-average molecular weight in solution polymerization feasible, using independent conversion measurements from an in-line densitometer. Successful closed-loop servo and regulatory control results are obtained.

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