DETERMINATION OF THE RESIDENCE-TIME DISTRIBUTION IN INDUSTRIAL DRYER FOR THE PRODUCTION OF RECYCLED POLYESTER Original scientific paper

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FELIPE ZAULI DA SILVA
IZABELLA CARNEIRO BASTOS
RAFAEL FIRMANI PERNA
SERGIO ANDRES VILLALBA MORALES

Abstract

The study proposes the evaluation of the residence-time distribution (RTD) in situ in an industrial dryer for the production of recycled polyester fibers (PES) from colorless polyethylene terephthalate (PET) flakes without interruption of the production. A disturbance of the pulse type was employed, in which the tracer (blue PET flakes) had previously been crystalized and its concentration was obtained according to the time at the dryer outlet. Additionally, analyses of intrinsic viscosity and crystallization percentage of the PET flakes (colorless and blue) and PES intrinsic viscosity and color force were performed. By RTD, the mean residence time (322.8 min), the variance (1305.4 min2), the standard deviation (36.1 min) and the relative error (1.5%) were obtained when com­pared to the theoretical residence time, indicating the absence of preferred paths or flake agglomerates in the equipment. Finally, the characterization demonstrated that there was no alteration in the parameters of product quality during RTD evaluation, confirming the potential of application of this method­ology for diagnoses of continuous industrial processes.

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DA SILVA, F. Z. ., CARNEIRO BASTOS, I., FIRMANI PERNA, R. ., & VILLALBA MORALES, S. A. . (2021). DETERMINATION OF THE RESIDENCE-TIME DISTRIBUTION IN INDUSTRIAL DRYER FOR THE PRODUCTION OF RECYCLED POLYESTER: Original scientific paper. Chemical Industry & Chemical Engineering Quarterly, 27(3), 289–298. https://doi.org/10.2298/CICEQ200121047Z
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