Reduction of Transients between Steady States in the Continuous Production of High-Impact Polystyrene

This work theoretically investigates the reduction of transients during changes of grade in a continuous plant for the production of high-impact polystyrene (HIPS). A mathematical model was developed that predicts the global molecular structure and the melt flow index (MFI). The switching times of t...

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Published inIndustrial & engineering chemistry research Vol. 44; no. 22; pp. 8354 - 8367
Main Authors Luciani, Carla V, Estenoz, Diana A, Meira, Gregorio R, Oliva, Haydée M
Format Journal Article
LanguageEnglish
Published Washington, DC American Chemical Society 26.10.2005
Subjects
Applied sciences
Chemical engineering
Exact sciences and technology
Steady state
Production
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Abstract This work theoretically investigates the reduction of transients during changes of grade in a continuous plant for the production of high-impact polystyrene (HIPS). A mathematical model was developed that predicts the global molecular structure and the melt flow index (MFI). The switching times of the off-specs accumulation period were selected on the basis of the admissible MFI ranges. Smoother transitions and reduced off-specs can be produced through a simple readjustment (with respect to the original plant policy) of the two intermediate chain transfer agent (CTA) loads into the batch dissolver. For the transitions that involve a large difference in their MFIs, the off-specs can be reduced by 60%, with respect to the original plant policy, by including a transient feed of CTA into an intermediate stirred reactor.
AbstractList This work theoretically investigates the reduction of transients during changes of grade in a continuous plant for the production of high-impact polystyrene (HIPS). A mathematical model was developed that predicts the global molecular structure and the melt flow index (MFI). The switching times of the off-specs accumulation period were selected on the basis of the admissible MFI ranges. Smoother transitions and reduced off-specs can be produced through a simple readjustment (with respect to the original plant policy) of the two intermediate chain transfer agent (CTA) loads into the batch dissolver. For the transitions that involve a large difference in their MFIs, the off-specs can be reduced by 60%, with respect to the original plant policy, by including a transient feed of CTA into an intermediate stirred reactor.
Author Meira, Gregorio R
Estenoz, Diana A
Luciani, Carla V
Oliva, Haydée M
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Title Reduction of Transients between Steady States in the Continuous Production of High-Impact Polystyrene
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