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Modeling of industrial nylon‐6,6 polycondensation process in a twin‐screw extruder reactor. I. phenomenological model and parameter adjusting
Author(s) -
Giudici Reinaldo,
Do Nascimento Cláudio Augusto Oller,
Beiler Isabel Capocchi,
Scherbakoff Natália
Publication year - 1998
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19980228)67:9<1573::aid-app9>3.0.co;2-a
Subject(s) - plastics extrusion , condensation polymer , polymer , materials science , evaporation , plug flow , mass transfer , volumetric flow rate , phenomenological model , thermodynamics , plug flow reactor model , nylon 6 , polymer chemistry , flow (mathematics) , chemical engineering , mechanics , continuous stirred tank reactor , composite material , mathematics , physics , engineering , statistics
This article describes a mathematical model for the finishing stage of nylon‐6,6 polycondensation in a twin‐screw extruder reactor. In the model, the extruder is conceptually divided into two regions. The first one is the partially filled degassing zone, which is operated under low pressure and where the evaporation of water from the polymer takes place. The rate of evaporation is considered to depend on an overall mass transfer coefficient and is limited by the water–polymer physical equilibrium. In the second region, which is fully filled, the polymer flow is assumed to be plug‐flow and, in this region, the reversible polycondensation reaction occurs, as well as degradation reactions. A comparison with experimental data obtained in an industrial plant shows fairly good agreement with model predictions after optimal fitting of the rate coefficients. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 67:1573–1587, 1998